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cfConjgQuo_normH K (phi : 'CF(H)) y : y \in 'N(K) -> y \in 'N(H) -> ((phi / K) ^ coset K y)%CF = (phi ^ y / K)%CF. Proof. move=> nKy nHy; have keryK: (K \subset cfker (phi ^ y)) = (K \subset cfker phi). by rewrite cfker_conjg // -{1}(normP nKy) conjSg. have [kerK | not_kerK] := boolP (K \subset cfker phi); last first. by rewrite !cfQuoEout ?rmorph_alg ?cfConjg1 ?keryK. apply/cfun_inP=> _ /morphimP[x nKx Hx ->]. have nHyb: coset K y \in 'N(H / K) by rewrite inE -morphimJ ?(normP nHy). rewrite !(cfConjgE, cfQuoEnorm) ?keryK // ?in_setI ?Hx //. rewrite -morphV -?morphJ ?groupV // cfQuoEnorm //. by rewrite inE memJ_norm ?Hx ?groupJ ?groupV. Qed.
Lemma
character
[ "From HB Require Import structures", "From mathcomp Require Import ssreflect ssrfun ssrbool eqtype ssrnat seq path", "From mathcomp Require Import choice fintype div tuple finfun bigop prime order", "From mathcomp Require Import ssralg ssrnum finset fingroup morphism perm", "From mathcomp Require Import aut...
character/inertia.v
cfConjgQuo_norm
cfConjgQuoG H K (phi : 'CF(H)) y : H <| G -> K <| G -> y \in G -> ((phi / K) ^ coset K y)%CF = (phi ^ y / K)%CF. Proof. move=> /andP[_ nHG] /andP[_ nKG] Gy. by rewrite cfConjgQuo_norm ?(subsetP nHG) ?(subsetP nKG). Qed.
Lemma
character
[ "From HB Require Import structures", "From mathcomp Require Import ssreflect ssrfun ssrbool eqtype ssrnat seq path", "From mathcomp Require Import choice fintype div tuple finfun bigop prime order", "From mathcomp Require Import ssralg ssrnum finset fingroup morphism perm", "From mathcomp Require Import aut...
character/inertia.v
cfConjgQuo
inertia_mod_preG H K (phi : 'CF(H / K)) : H <| G -> K <| G -> 'I_G[phi %% K] = G :&: coset K @*^-1 'I_(G / K)[phi]. Proof. by move=> nsHG /andP[_]; apply: inertia_morph_pre. Qed.
Lemma
character
[ "From HB Require Import structures", "From mathcomp Require Import ssreflect ssrfun ssrbool eqtype ssrnat seq path", "From mathcomp Require Import choice fintype div tuple finfun bigop prime order", "From mathcomp Require Import ssralg ssrnum finset fingroup morphism perm", "From mathcomp Require Import aut...
character/inertia.v
inertia_mod_pre
inertia_mod_quoG H K (phi : 'CF(H / K)) : H <| G -> K <| G -> ('I_G[phi %% K] / K)%g = 'I_(G / K)[phi]. Proof. by move=> nsHG /andP[_]; apply: inertia_morph_im. Qed.
Lemma
character
[ "From HB Require Import structures", "From mathcomp Require Import ssreflect ssrfun ssrbool eqtype ssrnat seq path", "From mathcomp Require Import choice fintype div tuple finfun bigop prime order", "From mathcomp Require Import ssralg ssrnum finset fingroup morphism perm", "From mathcomp Require Import aut...
character/inertia.v
inertia_mod_quo
inertia_quoG H K (phi : 'CF(H)) : H <| G -> K <| G -> K \subset cfker phi -> 'I_(G / K)[phi / K] = ('I_G[phi] / K)%g. Proof. move=> nsHG nsKG kerK; rewrite -inertia_mod_quo ?cfQuoK //. by rewrite (normalS _ (normal_sub nsHG)) // (subset_trans _ (cfker_sub phi)). Qed.
Lemma
character
[ "From HB Require Import structures", "From mathcomp Require Import ssreflect ssrfun ssrbool eqtype ssrnat seq path", "From mathcomp Require Import choice fintype div tuple finfun bigop prime order", "From mathcomp Require Import ssralg ssrnum finset fingroup morphism perm", "From mathcomp Require Import aut...
character/inertia.v
inertia_quo
cfConjgSdprodphi y : y \in 'N(K) -> y \in 'N(H) -> (cfSdprod defG phi ^ y = cfSdprod defG (phi ^ y))%CF. Proof. move=> nKy nHy. have nGy: y \in 'N(G) by rewrite -sub1set -(sdprodW defG) normsM ?sub1set. rewrite -{2}[phi](cfSdprodK defG) cfConjgRes_norm // cfRes_sdprodK //. by rewrite cfker_conjg // -{1}(normP nKy) conjSg cfker_sdprod. Qed.
Lemma
character
[ "From HB Require Import structures", "From mathcomp Require Import ssreflect ssrfun ssrbool eqtype ssrnat seq path", "From mathcomp Require Import choice fintype div tuple finfun bigop prime order", "From mathcomp Require Import ssralg ssrnum finset fingroup morphism perm", "From mathcomp Require Import aut...
character/inertia.v
cfConjgSdprod
inertia_sdprod(L : {group gT}) phi : L \subset 'N(K) -> L \subset 'N(H) -> 'I_L[cfSdprod defG phi] = 'I_L[phi]. Proof. move=> nKL nHL; have nGL: L \subset 'N(G) by rewrite -(sdprodW defG) normsM. apply/setP=> z; rewrite !in_setI ![z \in 'I[_]]inE; apply: andb_id2l => Lz. rewrite cfConjgSdprod ?(subsetP nKL) ?(subsetP nHL) ?(subsetP nGL) //=. by rewrite (can_eq (cfSdprodK defG)). Qed.
Lemma
character
[ "From HB Require Import structures", "From mathcomp Require Import ssreflect ssrfun ssrbool eqtype ssrnat seq path", "From mathcomp Require Import choice fintype div tuple finfun bigop prime order", "From mathcomp Require Import ssralg ssrnum finset fingroup morphism perm", "From mathcomp Require Import aut...
character/inertia.v
inertia_sdprod
cfConjgDprodlphi y : y \in 'N(K) -> y \in 'N(H) -> (cfDprodl KxH phi ^ y = cfDprodl KxH (phi ^ y))%CF. Proof. by move=> nKy nHy; apply: cfConjgSdprod. Qed.
Lemma
character
[ "From HB Require Import structures", "From mathcomp Require Import ssreflect ssrfun ssrbool eqtype ssrnat seq path", "From mathcomp Require Import choice fintype div tuple finfun bigop prime order", "From mathcomp Require Import ssralg ssrnum finset fingroup morphism perm", "From mathcomp Require Import aut...
character/inertia.v
cfConjgDprodl
cfConjgDprodrpsi y : y \in 'N(K) -> y \in 'N(H) -> (cfDprodr KxH psi ^ y = cfDprodr KxH (psi ^ y))%CF. Proof. by move=> nKy nHy; apply: cfConjgSdprod. Qed.
Lemma
character
[ "From HB Require Import structures", "From mathcomp Require Import ssreflect ssrfun ssrbool eqtype ssrnat seq path", "From mathcomp Require Import choice fintype div tuple finfun bigop prime order", "From mathcomp Require Import ssralg ssrnum finset fingroup morphism perm", "From mathcomp Require Import aut...
character/inertia.v
cfConjgDprodr
cfConjgDprodphi psi y : y \in 'N(K) -> y \in 'N(H) -> (cfDprod KxH phi psi ^ y = cfDprod KxH (phi ^ y) (psi ^ y))%CF. Proof. by move=> nKy nHy; rewrite rmorphM /= cfConjgDprodl ?cfConjgDprodr. Qed.
Lemma
character
[ "From HB Require Import structures", "From mathcomp Require Import ssreflect ssrfun ssrbool eqtype ssrnat seq path", "From mathcomp Require Import choice fintype div tuple finfun bigop prime order", "From mathcomp Require Import ssralg ssrnum finset fingroup morphism perm", "From mathcomp Require Import aut...
character/inertia.v
cfConjgDprod
inertia_dprodlL phi : L \subset 'N(K) -> L \subset 'N(H) -> 'I_L[cfDprodl KxH phi] = 'I_L[phi]. Proof. by move=> nKL nHL; apply: inertia_sdprod. Qed.
Lemma
character
[ "From HB Require Import structures", "From mathcomp Require Import ssreflect ssrfun ssrbool eqtype ssrnat seq path", "From mathcomp Require Import choice fintype div tuple finfun bigop prime order", "From mathcomp Require Import ssralg ssrnum finset fingroup morphism perm", "From mathcomp Require Import aut...
character/inertia.v
inertia_dprodl
inertia_dprodrL psi : L \subset 'N(K) -> L \subset 'N(H) -> 'I_L[cfDprodr KxH psi] = 'I_L[psi]. Proof. by move=> nKL nHL; apply: inertia_sdprod. Qed.
Lemma
character
[ "From HB Require Import structures", "From mathcomp Require Import ssreflect ssrfun ssrbool eqtype ssrnat seq path", "From mathcomp Require Import choice fintype div tuple finfun bigop prime order", "From mathcomp Require Import ssralg ssrnum finset fingroup morphism perm", "From mathcomp Require Import aut...
character/inertia.v
inertia_dprodr
inertia_dprodL (phi : 'CF(K)) (psi : 'CF(H)) : L \subset 'N(K) -> L \subset 'N(H) -> phi 1%g != 0 -> psi 1%g != 0 -> 'I_L[cfDprod KxH phi psi] = 'I_L[phi] :&: 'I_L[psi]. Proof. move=> nKL nHL nz_phi nz_psi; apply/eqP; rewrite eqEsubset subsetI. rewrite -{1}(inertia_scale_nz psi nz_phi) -{1}(inertia_scale_nz phi nz_psi). rewrite -(cfDprod_Resl KxH) -(cfDprod_Resr KxH) !sub_inertia_Res //=. by rewrite -inertia_dprodl -?inertia_dprodr // -setIIr setIS ?inertia_mul. Qed.
Lemma
character
[ "From HB Require Import structures", "From mathcomp Require Import ssreflect ssrfun ssrbool eqtype ssrnat seq path", "From mathcomp Require Import choice fintype div tuple finfun bigop prime order", "From mathcomp Require Import ssralg ssrnum finset fingroup morphism perm", "From mathcomp Require Import aut...
character/inertia.v
inertia_dprod
inertia_dprod_irrL i j : L \subset 'N(K) -> L \subset 'N(H) -> 'I_L[cfDprod KxH 'chi_i 'chi_j] = 'I_L['chi_i] :&: 'I_L['chi_j]. Proof. by move=> nKL nHL; rewrite inertia_dprod ?irr1_neq0. Qed.
Lemma
character
[ "From HB Require Import structures", "From mathcomp Require Import ssreflect ssrfun ssrbool eqtype ssrnat seq path", "From mathcomp Require Import choice fintype div tuple finfun bigop prime order", "From mathcomp Require Import ssralg ssrnum finset fingroup morphism perm", "From mathcomp Require Import aut...
character/inertia.v
inertia_dprod_irr
cfConjgBigdprodii (phi : 'CF(A i)) : (cfBigdprodi defG phi ^ y = cfBigdprodi defG (phi ^ y))%CF. Proof. rewrite cfConjgDprodl; try by case: ifP => [/nAy// | _]; rewrite norm1 inE. congr (cfDprodl _ _); case: ifP => [Pi | _]. by rewrite cfConjgRes_norm ?nAy. by apply/cfun_inP=> _ /set1P->; rewrite !(cfRes1, cfConjg1). rewrite -sub1set norms_gen ?norms_bigcup // sub1set. by apply/bigcapP=> j /andP[/nAy]. Qed.
Lemma
character
[ "From HB Require Import structures", "From mathcomp Require Import ssreflect ssrfun ssrbool eqtype ssrnat seq path", "From mathcomp Require Import choice fintype div tuple finfun bigop prime order", "From mathcomp Require Import ssralg ssrnum finset fingroup morphism perm", "From mathcomp Require Import aut...
character/inertia.v
cfConjgBigdprodi
cfConjgBigdprodphi : (cfBigdprod defG phi ^ y = cfBigdprod defG (fun i => phi i ^ y))%CF. Proof. by rewrite rmorph_prod /=; apply: eq_bigr => i _; apply: cfConjgBigdprodi. Qed.
Lemma
character
[ "From HB Require Import structures", "From mathcomp Require Import ssreflect ssrfun ssrbool eqtype ssrnat seq path", "From mathcomp Require Import choice fintype div tuple finfun bigop prime order", "From mathcomp Require Import ssralg ssrnum finset fingroup morphism perm", "From mathcomp Require Import aut...
character/inertia.v
cfConjgBigdprod
inertia_bigdprodii (phi : 'CF(A i)) : P i -> 'I_L[cfBigdprodi defG phi] = 'I_L[phi]. Proof. move=> Pi; rewrite inertia_dprodl ?Pi ?cfRes_id ?nAL //. by apply/norms_gen/norms_bigcup/bigcapsP=> j /andP[/nAL]. Qed.
Lemma
character
[ "From HB Require Import structures", "From mathcomp Require Import ssreflect ssrfun ssrbool eqtype ssrnat seq path", "From mathcomp Require Import choice fintype div tuple finfun bigop prime order", "From mathcomp Require Import ssralg ssrnum finset fingroup morphism perm", "From mathcomp Require Import aut...
character/inertia.v
inertia_bigdprodi
inertia_bigdprodphi (Phi := cfBigdprod defG phi) : Phi 1%g != 0 -> 'I_L[Phi] = L :&: \bigcap_(i | P i) 'I_L[phi i]. Proof. move=> nz_Phi; apply/eqP; rewrite eqEsubset; apply/andP; split. rewrite subsetI Inertia_sub; apply/bigcapsP=> i Pi. have [] := cfBigdprodK nz_Phi Pi; move: (_ / _) => a nz_a <-. by rewrite inertia_scale_nz ?sub_inertia_Res //= ?nAL. rewrite subsetI subsetIl; apply: subset_trans (inertia_prod _ _ _). apply: setISS. by rewrite -(bigdprodWY defG) norms_gen ?norms_bigcup //; apply/bigcapsP. apply/bigcapsP=> i Pi; rewrite (bigcap_min i) //. by rewrite -inertia_bigdprodi ?subsetIr. Qed.
Lemma
character
[ "From HB Require Import structures", "From mathcomp Require Import ssreflect ssrfun ssrbool eqtype ssrnat seq path", "From mathcomp Require Import choice fintype div tuple finfun bigop prime order", "From mathcomp Require Import ssralg ssrnum finset fingroup morphism perm", "From mathcomp Require Import aut...
character/inertia.v
inertia_bigdprod
inertia_bigdprod_irrIphi (phi := fun i => 'chi_(Iphi i)) : 'I_L[cfBigdprod defG phi] = L :&: \bigcap_(i | P i) 'I_L[phi i]. Proof. rewrite inertia_bigdprod // -[cfBigdprod _ _]cfIirrE ?irr1_neq0 //. by apply: cfBigdprod_irr => i _; apply: mem_irr. Qed.
Lemma
character
[ "From HB Require Import structures", "From mathcomp Require Import ssreflect ssrfun ssrbool eqtype ssrnat seq path", "From mathcomp Require Import choice fintype div tuple finfun bigop prime order", "From mathcomp Require Import ssralg ssrnum finset fingroup morphism perm", "From mathcomp Require Import aut...
character/inertia.v
inertia_bigdprod_irr
constt_Inertia_bijection: [/\ {in calA, forall s, 'Ind[G] 'chi_s \in irr G},
Theorem
character
[ "From HB Require Import structures", "From mathcomp Require Import ssreflect ssrfun ssrbool eqtype ssrnat seq path", "From mathcomp Require Import choice fintype div tuple finfun bigop prime order", "From mathcomp Require Import ssralg ssrnum finset fingroup morphism perm", "From mathcomp Require Import aut...
character/inertia.v
constt_Inertia_bijection
mul_Iirrb := cfIirr ('chi_b * chi).
Definition
character
[ "From HB Require Import structures", "From mathcomp Require Import ssreflect ssrfun ssrbool eqtype ssrnat seq path", "From mathcomp Require Import choice fintype div tuple finfun bigop prime order", "From mathcomp Require Import ssralg ssrnum finset fingroup morphism perm", "From mathcomp Require Import aut...
character/inertia.v
mul_Iirr
mul_mod_Iirr(b : Iirr (G / N)) := mul_Iirr (mod_Iirr b). Hypotheses (nsNG : N <| G) (cNt : 'Res[N] chi = theta). Let sNG : N \subset G. Proof. exact: normal_sub. Qed. Let nNG : G \subset 'N(N). Proof. exact: normal_norm. Qed.
Definition
character
[ "From HB Require Import structures", "From mathcomp Require Import ssreflect ssrfun ssrbool eqtype ssrnat seq path", "From mathcomp Require Import choice fintype div tuple finfun bigop prime order", "From mathcomp Require Import ssralg ssrnum finset fingroup morphism perm", "From mathcomp Require Import aut...
character/inertia.v
mul_mod_Iirr
extendible_irr_invariant: G \subset 'I[theta]. Proof. apply/subsetP=> y Gy; have nNy := subsetP nNG y Gy. rewrite inE nNy; apply/eqP/cfun_inP=> x Nx; rewrite cfConjgE // -cNt. by rewrite !cfResE ?memJ_norm ?cfunJ ?groupV. Qed. Let IGtheta := extendible_irr_invariant.
Lemma
character
[ "From HB Require Import structures", "From mathcomp Require Import ssreflect ssrfun ssrbool eqtype ssrnat seq path", "From mathcomp Require Import choice fintype div tuple finfun bigop prime order", "From mathcomp Require Import ssralg ssrnum finset fingroup morphism perm", "From mathcomp Require Import aut...
character/inertia.v
extendible_irr_invariant
constt_Ind_mul_extf (phi := 'chi_f) (psi := phi * theta) : G \subset 'I[phi] -> psi \in irr N -> let calS := irr_constt ('Ind phi) in [/\ {in calS, forall b, 'chi_b * chi \in irr G}, {in calS &, injective mul_Iirr}, irr_constt ('Ind psi) =i [seq mul_Iirr b | b in calS] & 'Ind psi = \sum_(b in calS) '['Ind phi, 'chi_b] *: 'chi_(mul_Iirr b)]. Proof. move=> IGphi irr_psi calS. have IGpsi: G \subset 'I[psi]. by rewrite (subset_trans _ (inertia_mul _ _)) // subsetI IGphi. pose e b := '['Ind[G] phi, 'chi_b]; pose d b g := '['chi_b * chi, 'chi_g * chi]. have Ne b: e b \in Num.nat by rewrite Cnat_cfdot_char ?cfInd_char ?irr_char. have egt0 b: b \in calS -> e b > 0 by rewrite natr_gt0. have DphiG: 'Ind phi = \sum_(b in calS) e b *: 'chi_b := cfun_sum_constt _. have DpsiG: 'Ind psi = \sum_(b in calS) e b *: 'chi_b * chi. by rewrite /psi -cNt cfIndM // DphiG mulr_suml. pose d_delta := [forall b in calS, forall g in calS, d b g == (b == g)%:R]. have charMchi b: 'chi_b * chi \is a character by rewrite rpredM ?irr_char. have [_]: '['Ind[G] phi] <= '['Ind[G] psi] ?= iff d_delta. pose sum_delta := \sum_(b in calS) e b * \sum_(g in calS) e g * (b == g)%:R. pose sum_d := \sum_(b in calS) e b * \sum_(g in calS) e g * d b g. have ->: '['Ind[G] phi] = sum_delta. rewrite DphiG cfdot_suml; apply: eq_bigr => b _; rewrite cfdotZl cfdot_sumr. by congr (_ * _); apply: eq_bigr => g; rewrite cfdotZr cfdot_irr conj_natr. have ->: '['Ind[G] psi] = sum_d. rewrite DpsiG cfdot_suml ...
Theorem
character
[ "From HB Require Import structures", "From mathcomp Require Import ssreflect ssrfun ssrbool eqtype ssrnat seq path", "From mathcomp Require Import choice fintype div tuple finfun bigop prime order", "From mathcomp Require Import ssralg ssrnum finset fingroup morphism perm", "From mathcomp Require Import aut...
character/inertia.v
constt_Ind_mul_ext
invariant_chief_irr_casesG K L s (theta := 'chi[K]_s) : chief_factor G L K -> abelian (K / L) -> G \subset 'I[theta] -> let t := #|K : L| in [\/ 'Res[L] theta \in irr L, exists2 e, exists p, 'Res[L] theta = e%:R *: 'chi_p & (e ^ 2)%N = t | exists2 p, injective p & 'Res[L] theta = \sum_(i < t) 'chi_(p i)]. Proof. case/andP=> /maxgroupP[/andP[ltLK nLG] maxL] nsKG abKbar IGtheta t. have [sKG nKG] := andP nsKG; have sLG := subset_trans (proper_sub ltLK) sKG. have nsLG: L <| G by apply/andP. have nsLK := normalS (proper_sub ltLK) sKG nsLG; have [sLK nLK] := andP nsLK. have [p0 sLp0] := constt_cfRes_irr L s; rewrite -/theta in sLp0. pose phi := 'chi_p0; pose T := 'I_G[phi]. have sTG: T \subset G := subsetIl G _. have /eqP mulKT: (K * T)%g == G. rewrite eqEcard mulG_subG sKG sTG -LagrangeMr -indexgI -(Lagrange sTG) /= -/T. rewrite mulnC leq_mul // setIA (setIidPl sKG) -!size_cfclass // -/phi. rewrite uniq_leq_size ?cfclass_uniq // => _ /cfclassP[x Gx ->]. have: conjg_Iirr p0 x \in irr_constt ('Res theta). have /inertiaJ <-: x \in 'I[theta] := subsetP IGtheta x Gx. by rewrite -(cfConjgRes _ nsKG) // irr_consttE conjg_IirrE // cfConjg_iso. apply: contraR; rewrite -conjg_IirrE // => not_sLp0x. rewrite (Clifford_Res_sum_cfclass nsLK sLp0) cfdotZl cfdot_suml. rewrite big1_seq ?mulr0 // => _ /cfclassP[y Ky ->]; rewrite -conjg_IirrE //. rewrite cfdot_irr mulrb ifN_eq ?(contraNneq _ not_sLp0x) // => <-. by rewrite conjg_IirrE //; apply/cfclassP; exists y. have nsKT_G: K : ...
Theorem
character
[ "From HB Require Import structures", "From mathcomp Require Import ssreflect ssrfun ssrbool eqtype ssrnat seq path", "From mathcomp Require Import choice fintype div tuple finfun bigop prime order", "From mathcomp Require Import ssralg ssrnum finset fingroup morphism perm", "From mathcomp Require Import aut...
character/inertia.v
invariant_chief_irr_cases
extend_to_cfdetG N s c0 u : let theta := 'chi_s in let lambda := cfDet theta in let mu := 'chi_u in N <| G -> coprime #|G : N| (Num.truncn (theta 1%g)) -> 'Res[N, G] 'chi_c0 = theta -> 'Res[N, G] mu = lambda -> exists2 c, 'Res 'chi_c = theta /\ cfDet 'chi_c = mu & forall c1, 'Res 'chi_c1 = theta -> cfDet 'chi_c1 = mu -> c1 = c. Proof. move=> theta lambda mu nsNG; set e := #|G : N|; set f := Num.truncn _. set eta := 'chi_c0 => co_e_f etaNth muNlam; have [sNG nNG] := andP nsNG. have fE: f%:R = theta 1%g by rewrite truncnK ?Cnat_irr1. pose nu := cfDet eta; have lin_nu: nu \is a linear_char := cfDet_lin_char _. have nuNlam: 'Res nu = lambda by rewrite -cfDetRes ?irr_char ?etaNth. have lin_lam: lambda \is a linear_char := cfDet_lin_char _. have lin_mu: mu \is a linear_char. by have:= lin_lam; rewrite -muNlam; apply: cfRes_lin_lin; apply: irr_char. have [Unu Ulam] := (lin_char_unitr lin_nu, lin_char_unitr lin_lam). pose alpha := mu / nu. have alphaN_1: 'Res[N] alpha = 1 by rewrite rmorph_div //= muNlam nuNlam divrr. have lin_alpha: alpha \is a linear_char by apply: rpred_div. have alpha_e: alpha ^+ e = 1. have kerNalpha: N \subset cfker alpha. by rewrite -subsetIidl -cfker_Res ?lin_charW // alphaN_1 cfker_cfun1. apply/eqP; rewrite -(cfQuoK nsNG kerNalpha) -rmorphXn cfMod_eq1 //. rewrite -dvdn_cforder /e -card_quotient //. by rewrite cforder_lin_char_dvdG ?cfQuo_lin_char. have det_alphaXeta b: cfDet (alpha ^+ b * eta) = alpha ^+ (b * f) * nu. by rewrite cfDe ...
Lemma
character
[ "From HB Require Import structures", "From mathcomp Require Import ssreflect ssrfun ssrbool eqtype ssrnat seq path", "From mathcomp Require Import choice fintype div tuple finfun bigop prime order", "From mathcomp Require Import ssralg ssrnum finset fingroup morphism perm", "From mathcomp Require Import aut...
character/inertia.v
extend_to_cfdet
solvable_irr_extendible_from_detG N s (theta := 'chi[N]_s) : N <| G -> solvable (G / N) -> G \subset 'I[theta] -> coprime #|G : N| (Num.truncn (theta 1%g)) -> [exists c, 'Res 'chi[G]_c == theta] = [exists u, 'Res 'chi[G]_u == cfDet theta]. Proof. set e := #|G : N|; set f := Num.truncn _ => nsNG solG IGtheta co_e_f. apply/exists_eqP/exists_eqP=> [[c cNth] | [u uNdth]]. have /lin_char_irr/irrP[u Du] := cfDet_lin_char 'chi_c. by exists u; rewrite -Du -cfDetRes ?irr_char ?cNth. move: {2}e.+1 (ltnSn e) => m. elim: m => // m IHm in G u e nsNG solG IGtheta co_e_f uNdth *. rewrite ltnS => le_e; have [sNG nNG] := andP nsNG. have [<- | ltNG] := eqsVneq N G; first by exists s; rewrite cfRes_id. have [G0 maxG0 sNG0]: {G0 | maxnormal (gval G0) G G & N \subset G0}. by apply: maxgroup_exists; rewrite properEneq ltNG sNG. have [/andP[ltG0G nG0G] maxG0_P] := maxgroupP maxG0. set mu := 'chi_u in uNdth; have lin_mu: mu \is a linear_char. by rewrite qualifE/= irr_char -(cfRes1 N) uNdth /= lin_char1 ?cfDet_lin_char. have sG0G := proper_sub ltG0G; have nsNG0 := normalS sNG0 sG0G nsNG. have nsG0G: G0 <| G by apply/andP. have /lin_char_irr/irrP[u0 Du0] := cfRes_lin_char G0 lin_mu. have u0Ndth: 'Res 'chi_u0 = cfDet theta by rewrite -Du0 cfResRes. have IG0theta: G0 \subset 'I[theta]. by rewrite (subset_trans sG0G) // -IGtheta subsetIr. have coG0f: coprime #|G0 : N| f by rewrite (coprime_dvdl _ co_e_f) ?indexSg. have{m IHm le_e} [c0 c0Ns]: exists c0, 'Res 'chi[G0]_c0 = theta. have solG0: solvable (G0 / N) := ...
Theorem
character
[ "From HB Require Import structures", "From mathcomp Require Import ssreflect ssrfun ssrbool eqtype ssrnat seq path", "From mathcomp Require Import choice fintype div tuple finfun bigop prime order", "From mathcomp Require Import ssralg ssrnum finset fingroup morphism perm", "From mathcomp Require Import aut...
character/inertia.v
solvable_irr_extendible_from_det
extend_linear_char_from_SylowG N (lambda : 'CF(N)) : N <| G -> lambda \is a linear_char -> G \subset 'I[lambda] -> (forall p, p \in \pi('o(lambda)%CF) -> exists2 Hp : {group gT}, [/\ N \subset Hp, Hp \subset G & p.-Sylow(G / N) (Hp / N)%g] & exists u, 'Res 'chi[Hp]_u = lambda) -> exists u, 'Res[N, G] 'chi_u = lambda. Proof. set m := 'o(lambda)%CF => nsNG lam_lin IGlam p_ext_lam. have [sNG nNG] := andP nsNG; have linN := @cfRes_lin_lin _ _ N. wlog [p p_lam]: lambda @m lam_lin IGlam p_ext_lam / exists p : nat, \pi(m) =i (p : nat_pred). - move=> IHp; have [linG [cf [inj_cf _ lin_cf onto_cf]]] := lin_char_group N. case=> cf1 cfM cfX _ cf_order; have [lam cf_lam] := onto_cf _ lam_lin. pose mu p := cf lam.`_p; pose pi_m p := p \in \pi(m). have Dm: m = #[lam] by rewrite /m cfDet_order_lin // cf_lam cf_order. have Dlambda: lambda = \prod_(p < m.+1 | pi_m p) mu p. rewrite -(big_morph cf cfM cf1) big_mkcond cf_lam /pi_m Dm; congr (cf _). rewrite -{1}[lam]prod_constt big_mkord; apply: eq_bigr => p _. by case: ifPn => // p'lam; apply/constt1P; rewrite /p_elt p'natEpi. have lin_mu p: mu p \is a linear_char by rewrite /mu cfX -cf_lam rpredX. suffices /fin_all_exists [u uNlam] (p : 'I_m.+1): exists u, pi_m p -> 'Res[N, G] 'chi_u = mu p. - pose nu := \prod_(p < m.+1 | pi_m p) 'chi_(u p). have lin_nu: nu \is a linear_char. by apply: rpred_prod => p m_p; rewrite linN ?irr_char ?uNlam. have /irrP[u1 Dnu] := lin_char_irr lin_nu. by exists u1; ...
Theorem
character
[ "From HB Require Import structures", "From mathcomp Require Import ssreflect ssrfun ssrbool eqtype ssrnat seq path", "From mathcomp Require Import choice fintype div tuple finfun bigop prime order", "From mathcomp Require Import ssralg ssrnum finset fingroup morphism perm", "From mathcomp Require Import aut...
character/inertia.v
extend_linear_char_from_Sylow
inertia_Frobenius_keri : i != 0 -> 'I_G['chi[K]_i] = K. Proof. have [_ _ nsKG regK] := Frobenius_kerP frobGK; have [sKG nKG] := andP nsKG. move=> nzi; apply/eqP; rewrite eqEsubset sub_Inertia // andbT. apply/subsetP=> x /setIP[Gx /setIdP[nKx /eqP x_stab_i]]. have actIirrK: is_action G (@conjg_Iirr _ K). split=> [y j k eq_jk | j y z Gy Gz]. by apply/irr_inj/(can_inj (cfConjgK y)); rewrite -!conjg_IirrE eq_jk. by apply: irr_inj; rewrite !conjg_IirrE (cfConjgM _ nsKG). pose ito := Action actIirrK; pose cto := ('Js \ (subsetT G))%act. have acts_Js : [acts G, on classes K | 'Js]. apply/subsetP=> y Gy; have nKy := subsetP nKG y Gy. rewrite !inE; apply/subsetP=> _ /imsetP[z Gz ->] /[!inE]/=. rewrite -class_rcoset norm_rlcoset // class_lcoset. by apply: imset_f; rewrite memJ_norm. have acts_cto : [acts G, on classes K | cto] by rewrite astabs_ract subsetIidl. pose m := #|'Fix_(classes K | cto)[x]|. have def_m: #|'Fix_ito[x]| = m. apply: card_afix_irr_classes => // j y _ Ky /imsetP[_ /imsetP[z Kz ->] ->]. by rewrite conjg_IirrE cfConjgEJ // cfunJ. have: (m != 1)%N. rewrite -def_m (cardD1 (0 : Iirr K)) (cardD1 i) !(inE, sub1set) /=. by rewrite conjg_Iirr0 nzi eqxx -(inj_eq irr_inj) conjg_IirrE x_stab_i eqxx. apply: contraR => notKx; apply/cards1P; exists 1%g; apply/esym/eqP. rewrite eqEsubset !(sub1set, inE) classes1 /= conjs1g eqxx /=. apply/subsetP=> _ /setIP[/imsetP[y Ky ->] /afix1P /= cyKx]. have /imsetP[z Kz def_yx]: y ^ x \in y ^: K. by rewrite -cyKx; apply: imset_f; apply: ...
Theorem
character
[ "From HB Require Import structures", "From mathcomp Require Import ssreflect ssrfun ssrbool eqtype ssrnat seq path", "From mathcomp Require Import choice fintype div tuple finfun bigop prime order", "From mathcomp Require Import ssralg ssrnum finset fingroup morphism perm", "From mathcomp Require Import aut...
character/inertia.v
inertia_Frobenius_ker
irr_induced_Frobenius_keri : i != 0 -> 'Ind[G, K] 'chi_i \in irr G. Proof. move/inertia_Frobenius_ker/group_inj=> defK. have [_ _ nsKG _] := Frobenius_kerP frobGK. have [] := constt_Inertia_bijection i nsKG; rewrite defK cfInd_id => -> //. by rewrite constt_irr !inE. Qed.
Theorem
character
[ "From HB Require Import structures", "From mathcomp Require Import ssreflect ssrfun ssrbool eqtype ssrnat seq path", "From mathcomp Require Import choice fintype div tuple finfun bigop prime order", "From mathcomp Require Import ssralg ssrnum finset fingroup morphism perm", "From mathcomp Require Import aut...
character/inertia.v
irr_induced_Frobenius_ker
Frobenius_Ind_irrPj : reflect (exists2 i, i != 0 & 'chi_j = 'Ind[G, K] 'chi_i) (~~ (K \subset cfker 'chi_j)). Proof. have [_ _ nsKG _] := Frobenius_kerP frobGK; have [sKG nKG] := andP nsKG. apply: (iffP idP) => [not_chijK1 | [i nzi ->]]; last first. by rewrite cfker_Ind_irr ?sub_gcore // subGcfker. have /neq0_has_constt[i chijKi]: 'Res[K] 'chi_j != 0 by apply: Res_irr_neq0. have nz_i: i != 0. by apply: contraNneq not_chijK1 => i0; rewrite constt0_Res_cfker // -i0. have /irrP[k def_chik] := irr_induced_Frobenius_ker nz_i. have: '['chi_j, 'chi_k] != 0 by rewrite -def_chik -cfdot_Res_l. by rewrite cfdot_irr pnatr_eq0; case: (j =P k) => // ->; exists i. Qed.
Theorem
character
[ "From HB Require Import structures", "From mathcomp Require Import ssreflect ssrfun ssrbool eqtype ssrnat seq path", "From mathcomp Require Import choice fintype div tuple finfun bigop prime order", "From mathcomp Require Import ssralg ssrnum finset fingroup morphism perm", "From mathcomp Require Import aut...
character/inertia.v
Frobenius_Ind_irrP
group_num_field_exists(gT : finGroupType) (G : {group gT}) : {Qn : splittingFieldType rat & galois 1 {:Qn} & {QnC : {rmorphism Qn -> algC} & forall nuQn : argumentType [in 'Gal({:Qn} / 1)], {nu : {rmorphism algC -> algC} | {morph QnC: a / nuQn a >-> nu a}} & {w : Qn & #|G|.-primitive_root w /\ <<1; w>>%VS = fullv & forall (hT : finGroupType) (H : {group hT}) (phi : 'CF(H)), phi \is a character -> forall x, (#[x] %| #|G|)%N -> {a | QnC a = phi x}}}}. Proof. have [z prim_z] := C_prim_root_exists (cardG_gt0 G); set n := #|G| in prim_z *. have [Qn [QnC [[|w []] // [Dz] genQn]]] := num_field_exists [:: z]. have prim_w: n.-primitive_root w by rewrite -Dz fmorph_primitive_root in prim_z. have Q_Xn1: ('X^n - 1 : {poly Qn}) \is a polyOver 1%AS. by rewrite rpredB ?rpred1 ?rpredX //= polyOverX. have splitXn1: splittingFieldFor 1 ('X^n - 1) {:Qn}. pose r := codom (fun i : 'I_n => w ^+ i). have Dr: 'X^n - 1 = \prod_(y <- r) ('X - y%:P). by rewrite -(factor_Xn_sub_1 prim_w) big_mkord big_image. exists r; first by rewrite -Dr eqpxx. apply/eqP; rewrite eqEsubv subvf -genQn adjoin_seqSr //; apply/allP=> /=. by rewrite andbT -root_prod_XsubC -Dr; apply/unity_rootP/prim_expr_order. have Qn_ax : FieldExt_isSplittingField _ Qn by constructor; exists ('X^n - 1). exists (HB.pack_for (splittingFieldType rat) Qn Qn_ax). apply/splitting_galoisField. exists ('X^n - 1); split => //. apply: ...
Lemma
character
[ "From HB Require Import structures", "From mathcomp Require Import ssreflect ssrbool ssrfun eqtype ssrnat seq path", "From mathcomp Require Import div choice fintype tuple finfun bigop prime order", "From mathcomp Require Import ssralg poly finset fingroup morphism perm", "From mathcomp Require Import autom...
character/integral_char.v
group_num_field_exists
gring_classM_coef_set(Ki Kj : {set gT}) g := [set xy in [predX Ki & Kj] | let: (x, y) := xy in x * y == g]%g.
Definition
character
[ "From HB Require Import structures", "From mathcomp Require Import ssreflect ssrbool ssrfun eqtype ssrnat seq path", "From mathcomp Require Import div choice fintype tuple finfun bigop prime order", "From mathcomp Require Import ssralg poly finset fingroup morphism perm", "From mathcomp Require Import autom...
character/integral_char.v
gring_classM_coef_set
gring_classM_coef(i j k : 'I_#|classes G|) := #|gring_classM_coef_set (enum_val i) (enum_val j) (repr (enum_val k))|.
Definition
character
[ "From HB Require Import structures", "From mathcomp Require Import ssreflect ssrbool ssrfun eqtype ssrnat seq path", "From mathcomp Require Import div choice fintype tuple finfun bigop prime order", "From mathcomp Require Import ssralg poly finset fingroup morphism perm", "From mathcomp Require Import autom...
character/integral_char.v
gring_classM_coef
gring_class_sum(i : 'I_#|classes G|) := gset_mx F G (enum_val i). Local Notation "''K_' i" := (gring_class_sum i) (at level 8, i at level 2, format "''K_' i") : ring_scope. Local Notation a := gring_classM_coef.
Definition
character
[ "From HB Require Import structures", "From mathcomp Require Import ssreflect ssrbool ssrfun eqtype ssrnat seq path", "From mathcomp Require Import div choice fintype tuple finfun bigop prime order", "From mathcomp Require Import ssralg poly finset fingroup morphism perm", "From mathcomp Require Import autom...
character/integral_char.v
gring_class_sum
gring_class_sum_centrali : ('K_i \in 'Z(group_ring F G))%MS. Proof. by rewrite -classg_base_center (eq_row_sub i) // rowK. Qed.
Lemma
character
[ "From HB Require Import structures", "From mathcomp Require Import ssreflect ssrbool ssrfun eqtype ssrnat seq path", "From mathcomp Require Import div choice fintype tuple finfun bigop prime order", "From mathcomp Require Import ssralg poly finset fingroup morphism perm", "From mathcomp Require Import autom...
character/integral_char.v
gring_class_sum_central
set_gring_classM_coef(i j k : 'I_#|classes G|) g : g \in enum_val k -> a i j k = #|gring_classM_coef_set (enum_val i) (enum_val j) g|. Proof. rewrite /a; have /repr_classesP[] := enum_valP k; move: (repr _) => g1 Gg1 ->. have [/imsetP[zi Gzi ->] /imsetP[zj Gzj ->]] := (enum_valP i, enum_valP j). move=> g1Gg; have Gg := subsetP (class_subG Gg1 (subxx _)) _ g1Gg. set Aij := gring_classM_coef_set _ _. without loss suffices IH: g g1 Gg Gg1 g1Gg / (#|Aij g1| <= #|Aij g|)%N. by apply/eqP; rewrite eqn_leq !IH // class_sym. have [w Gw Dg] := imsetP g1Gg; pose J2 (v : gT) xy := (xy.1 ^ v, xy.2 ^ v)%g. have J2inj: injective (J2 w). by apply: can_inj (J2 w^-1)%g _ => [[x y]]; rewrite /J2 /= !conjgK. rewrite -(card_imset _ J2inj) subset_leq_card //; apply/subsetP. move=> _ /imsetP[[x y] /setIdP[/andP[/= x1Gx y1Gy] Dxy1] ->] /[!inE]/=. rewrite !(class_sym _ (_ ^ _)) !classGidl // class_sym x1Gx class_sym y1Gy. by rewrite -conjMg (eqP Dxy1) /= -Dg. Qed.
Lemma
character
[ "From HB Require Import structures", "From mathcomp Require Import ssreflect ssrbool ssrfun eqtype ssrnat seq path", "From mathcomp Require Import div choice fintype tuple finfun bigop prime order", "From mathcomp Require Import ssralg poly finset fingroup morphism perm", "From mathcomp Require Import autom...
character/integral_char.v
set_gring_classM_coef
gring_classM_expansioni j : 'K_i *m 'K_j = \sum_k (a i j k)%:R *: 'K_k. Proof. have [/imsetP[zi Gzi dKi] /imsetP[zj Gzj dKj]] := (enum_valP i, enum_valP j). pose aG := regular_repr F G; have sKG := subsetP (class_subG _ (subxx G)). transitivity (\sum_(x in zi ^: G) \sum_(y in zj ^: G) aG (x * y)%g). rewrite mulmx_suml -/aG dKi; apply: eq_bigr => x /sKG Gx. rewrite mulmx_sumr -/aG dKj; apply: eq_bigr => y /sKG Gy. by rewrite repr_mxM ?Gx ?Gy. pose h2 xy : gT := (xy.1 * xy.2)%g. pose h1 xy := enum_rank_in (classes1 G) (h2 xy ^: G). rewrite pair_big (partition_big h1 xpredT) //=; apply: eq_bigr => k _. rewrite (partition_big h2 [in enum_val k]) /= => [|[x y]]; last first. case/andP=> /andP[/= /sKG Gx /sKG Gy] /eqP <-. by rewrite enum_rankK_in ?class_refl ?mem_classes ?groupM ?Gx ?Gy. rewrite scaler_sumr; apply: eq_bigr => g Kk_g; rewrite scaler_nat. rewrite (set_gring_classM_coef _ _ Kk_g) -sumr_const; apply: eq_big => [] [x y]. rewrite !inE /= dKi dKj /h1 /h2 /=; apply: andb_id2r => /eqP ->. have /imsetP[zk Gzk dKk] := enum_valP k; rewrite dKk in Kk_g. by rewrite (class_eqP Kk_g) -dKk enum_valK_in eqxx andbT. by rewrite /h2 /= => /andP[_ /eqP->]. Qed.
Theorem
character
[ "From HB Require Import structures", "From mathcomp Require Import ssreflect ssrbool ssrfun eqtype ssrnat seq path", "From mathcomp Require Import div choice fintype tuple finfun bigop prime order", "From mathcomp Require Import ssralg poly finset fingroup morphism perm", "From mathcomp Require Import autom...
character/integral_char.v
gring_classM_expansion
gring_irr_mode_unlockable:= Unlockable gring_irr_mode.unlock. Arguments gring_irr_mode {gT G%_G} i%_R _%_g : extra scopes.
Canonical
character
[ "From HB Require Import structures", "From mathcomp Require Import ssreflect ssrbool ssrfun eqtype ssrnat seq path", "From mathcomp Require Import div choice fintype tuple finfun bigop prime order", "From mathcomp Require Import ssralg poly finset fingroup morphism perm", "From mathcomp Require Import autom...
character/integral_char.v
gring_irr_mode_unlockable
Aint_char(chi : 'CF(G)) x : chi \is a character -> chi x \in Aint. Proof. have [Gx /char_reprP[rG ->] {chi} | /cfun0->//] := boolP (x \in G). have [e [_ [unit_e _] [-> _] _]] := repr_rsim_diag rG Gx. rewrite rpred_sum // => i _; apply: (@Aint_unity_root #[x]) => //. exact/unity_rootP. Qed.
Lemma
character
[ "From HB Require Import structures", "From mathcomp Require Import ssreflect ssrbool ssrfun eqtype ssrnat seq path", "From mathcomp Require Import div choice fintype tuple finfun bigop prime order", "From mathcomp Require Import ssralg poly finset fingroup morphism perm", "From mathcomp Require Import autom...
character/integral_char.v
Aint_char
Aint_irri x : 'chi[G]_i x \in Aint. Proof. exact/Aint_char/irr_char. Qed. Local Notation R_G := (group_ring algCfield G). Local Notation a := gring_classM_coef.
Lemma
character
[ "From HB Require Import structures", "From mathcomp Require Import ssreflect ssrbool ssrfun eqtype ssrnat seq path", "From mathcomp Require Import div choice fintype tuple finfun bigop prime order", "From mathcomp Require Import ssralg poly finset fingroup morphism perm", "From mathcomp Require Import autom...
character/integral_char.v
Aint_irr
mx_irr_gring_op_center_scalarn (rG : mx_representation algCfield G n) A : mx_irreducible rG -> (A \in 'Z(R_G))%MS -> is_scalar_mx (gring_op rG A). Proof. move/groupC=> irrG /center_mxP[R_A cGA]. apply: mx_abs_irr_cent_scalar irrG _ _; apply/centgmxP => x Gx. by rewrite -(gring_opG rG Gx) -!gring_opM ?cGA // envelop_mx_id. Qed.
Lemma
character
[ "From HB Require Import structures", "From mathcomp Require Import ssreflect ssrbool ssrfun eqtype ssrnat seq path", "From mathcomp Require Import div choice fintype tuple finfun bigop prime order", "From mathcomp Require Import ssralg poly finset fingroup morphism perm", "From mathcomp Require Import autom...
character/integral_char.v
mx_irr_gring_op_center_scalar
cfRepr_gring_centern1 (rG : mx_representation algCfield G n1) A : cfRepr rG = 'chi_i -> (A \in 'Z(R_G))%MS -> gring_op rG A = 'omega_i[A]%:M. Proof. move=> def_rG Z_A; rewrite unlock xcfunZl -{2}def_rG xcfun_repr. have irr_rG: mx_irreducible rG. have sim_rG: mx_rsim 'Chi_i rG by apply: cfRepr_inj; rewrite irrRepr. exact: mx_rsim_irr sim_rG (socle_irr _). have /is_scalar_mxP[e ->] := mx_irr_gring_op_center_scalar irr_rG Z_A. congr _%:M; apply: (canRL (mulKf (irr1_neq0 i))). by rewrite mulrC -def_rG cfunE repr_mx1 group1 -mxtraceZ scalemx1. Qed.
Lemma
character
[ "From HB Require Import structures", "From mathcomp Require Import ssreflect ssrbool ssrfun eqtype ssrnat seq path", "From mathcomp Require Import div choice fintype tuple finfun bigop prime order", "From mathcomp Require Import ssralg poly finset fingroup morphism perm", "From mathcomp Require Import autom...
character/integral_char.v
cfRepr_gring_center
irr_gring_centerA : (A \in 'Z(R_G))%MS -> gring_op 'Chi_i A = 'omega_i[A]%:M. Proof. exact: cfRepr_gring_center (irrRepr i). Qed.
Lemma
character
[ "From HB Require Import structures", "From mathcomp Require Import ssreflect ssrbool ssrfun eqtype ssrnat seq path", "From mathcomp Require Import div choice fintype tuple finfun bigop prime order", "From mathcomp Require Import ssralg poly finset fingroup morphism perm", "From mathcomp Require Import autom...
character/integral_char.v
irr_gring_center
gring_irr_modeMA B : (A \in 'Z(R_G))%MS -> (B \in 'Z(R_G))%MS -> 'omega_i[A *m B] = 'omega_i[A] * 'omega_i[B]. Proof. move=> Z_A Z_B; have [[R_A cRA] [R_B cRB]] := (center_mxP Z_A, center_mxP Z_B). apply: mxZn_inj; rewrite scalar_mxM -!irr_gring_center ?gring_opM //. apply/center_mxP; split=> [|C R_C]; first exact: envelop_mxM. by rewrite mulmxA cRA // -!mulmxA cRB. Qed.
Lemma
character
[ "From HB Require Import structures", "From mathcomp Require Import ssreflect ssrbool ssrfun eqtype ssrnat seq path", "From mathcomp Require Import div choice fintype tuple finfun bigop prime order", "From mathcomp Require Import ssralg poly finset fingroup morphism perm", "From mathcomp Require Import autom...
character/integral_char.v
gring_irr_modeM
gring_mode_class_sum_eq(k : 'I_#|classes G|) g : g \in enum_val k -> 'omega_i['K_k] = #|g ^: G|%:R * 'chi_i g / 'chi_i 1%g. Proof. have /imsetP[x Gx DxG] := enum_valP k; rewrite DxG => /imsetP[u Gu ->{g}]. rewrite unlock classGidl ?cfunJ {u Gu}// mulrC mulr_natl. rewrite xcfunZl raddf_sum DxG -sumr_const /=; congr (_ * _). by apply: eq_bigr => _ /imsetP[u Gu ->]; rewrite xcfunG ?groupJ ?cfunJ. Qed.
Lemma
character
[ "From HB Require Import structures", "From mathcomp Require Import ssreflect ssrbool ssrfun eqtype ssrnat seq path", "From mathcomp Require Import div choice fintype tuple finfun bigop prime order", "From mathcomp Require Import ssralg poly finset fingroup morphism perm", "From mathcomp Require Import autom...
character/integral_char.v
gring_mode_class_sum_eq
Aint_gring_mode_class_sumk : 'omega_i['K_k] \in Aint. Proof. move: k; pose X := [tuple 'omega_i['K_k] | k < #|classes G| ]. have memX k: 'omega_i['K_k] \in X by apply: image_f. have S_P := Cint_spanP X; set S := Cint_span X in S_P. have S_X: {subset X <= S} by apply: mem_Cint_span. have S_1: 1 \in S. apply: S_X; apply/codomP; exists (enum_rank_in (classes1 G) 1%g). rewrite (@gring_mode_class_sum_eq _ 1%g) ?enum_rankK_in ?classes1 //. by rewrite mulfK ?irr1_neq0 // class1G cards1. suffices Smul: mulr_closed S. by move=> k; apply: fin_Csubring_Aint S_P _ _; rewrite ?S_X. split=> // _ _ /S_P[x ->] /S_P[y ->]. rewrite mulr_sumr rpred_sum // => j _. rewrite mulrzAr mulr_suml rpredMz ?rpred_sum // => k _. rewrite mulrzAl rpredMz {x y}// !nth_mktuple. rewrite -gring_irr_modeM ?gring_class_sum_central //. rewrite gring_classM_expansion raddf_sum rpred_sum // => jk _. by rewrite scaler_nat raddfMn rpredMn ?S_X ?memX. Qed.
Lemma
character
[ "From HB Require Import structures", "From mathcomp Require Import ssreflect ssrbool ssrfun eqtype ssrnat seq path", "From mathcomp Require Import div choice fintype tuple finfun bigop prime order", "From mathcomp Require Import ssralg poly finset fingroup morphism perm", "From mathcomp Require Import autom...
character/integral_char.v
Aint_gring_mode_class_sum
coprime_degree_support_cfcenterg : coprime (Num.truncn ('chi_i 1%g)) #|g ^: G| -> g \notin ('Z('chi_i))%CF -> 'chi_i g = 0. Proof. set m := Num.truncn _ => co_m_gG notZg. have [Gg | /cfun0-> //] := boolP (g \in G). have Dm: 'chi_i 1%g = m%:R by rewrite truncnK ?Cnat_irr1. have m_gt0: (0 < m)%N by rewrite -ltC_nat -Dm irr1_gt0. have nz_m: m%:R != 0 :> algC by rewrite pnatr_eq0 -lt0n. pose alpha := 'chi_i g / m%:R. have a_lt1: `|alpha| < 1. rewrite normrM normfV normr_nat -{2}(divff nz_m). rewrite lt_def (can_eq (mulfVK nz_m)) eq_sym -{1}Dm -irr_cfcenterE // notZg. by rewrite ler_pM2r ?invr_gt0 ?ltr0n // -Dm char1_ge_norm ?irr_char. have Za: alpha \in Aint. have [u _ /dvdnP[v eq_uv]] := Bezoutl #|g ^: G| m_gt0. suffices ->: alpha = v%:R * 'chi_i g - u%:R * (alpha * #|g ^: G|%:R). rewrite rpredB // rpredM ?rpred_nat ?Aint_irr //. by rewrite mulrC mulrA -Dm Aint_class_div_irr1. rewrite -mulrCA -[v%:R](mulfK nz_m) -!natrM -eq_uv (eqnP co_m_gG). by rewrite mulrAC -mulrA -/alpha mulr_natl mulr_natr mulrS addrK. have [Qn galQn [QnC gQnC [_ _ Qn_g]]] := group_num_field_exists <[g]>. have{Qn_g} [a Da]: exists a, QnC a = alpha. rewrite /alpha; have [a <-] := Qn_g _ G _ (irr_char i) g (dvdnn _). by exists (a / m%:R); rewrite fmorph_div rmorph_nat. have Za_nu nu: sval (gQnC nu) alpha \in Aint by rewrite Aint_aut. have norm_a_nu nu: `|sval (gQnC nu) alpha| <= 1. move: {nu}(sval _) => nu; rewrite fmorph_div rmorph_nat normrM normfV. rewrite normr_nat -Dm -(ler_pM2r (irr1_gt0 (aut_Iirr ...
Theorem
character
[ "From HB Require Import structures", "From mathcomp Require Import ssreflect ssrbool ssrfun eqtype ssrnat seq path", "From mathcomp Require Import div choice fintype tuple finfun bigop prime order", "From mathcomp Require Import ssralg poly finset fingroup morphism perm", "From mathcomp Require Import autom...
character/integral_char.v
coprime_degree_support_cfcenter
primes_class_simple_gt1C : simple G -> ~~ abelian G -> C \in (classes G)^# -> (size (primes #|C|) > 1)%N. Proof. move=> simpleG not_cGG /setD1P[ntC /imsetP[g Gg defC]]. have{ntC} nt_g: g != 1%g by rewrite defC classG_eq1 in ntC. rewrite ltnNge {C}defC; set m := #|_|; apply/negP=> p_natC. have{p_natC} [p p_pr [a Dm]]: {p : nat & prime p & {a | m = p ^ a}%N}. have /prod_prime_decomp->: (0 < m)%N by rewrite /m -index_cent1. rewrite prime_decompE; case Dpr: (primes _) p_natC => [|p []] // _. by exists 2%N => //; rewrite big_nil; exists 0. rewrite big_seq1; exists p; last by exists (logn p m). by have:= mem_primes p m; rewrite Dpr mem_head => /esym/and3P[]. have{simpleG} [ntG minG] := simpleP _ simpleG. pose p_dv1 i := (p %| 'chi[G]_i 1%g)%C. have p_dvd_supp_g i: ~~ p_dv1 i && (i != 0) -> 'chi_i g = 0. rewrite /p_dv1 irr1_degree dvdC_nat -prime_coprime // => /andP[co_p_i1 nz_i]. have fful_i: cfker 'chi_i = [1]. have /minG[//|/eqP] := cfker_normal 'chi_i. by rewrite eqEsubset subGcfker (negPf nz_i) andbF. have trivZ: 'Z(G) = [1] by have /minG[|/center_idP/idPn] := center_normal G. have trivZi: ('Z('chi_i))%CF = [1]. apply/trivgP; rewrite -quotient_sub1 ?norms1 //= -fful_i cfcenter_eq_center. rewrite fful_i subG1 -(isog_eq1 (isog_center (quotient1_isog G))) /=. by rewrite trivZ. rewrite coprime_degree_support_cfcenter ?trivZi ?inE //. by rewrite -/m Dm irr1_degree natrK coprime_sym coprimeXl. pose alpha := \sum_(i | p_dv1 i && (i != 0)) 'chi_i 1%g / p%:R * 'ch ...
Theorem
character
[ "From HB Require Import structures", "From mathcomp Require Import ssreflect ssrbool ssrfun eqtype ssrnat seq path", "From mathcomp Require Import div choice fintype tuple finfun bigop prime order", "From mathcomp Require Import ssralg poly finset fingroup morphism perm", "From mathcomp Require Import autom...
character/integral_char.v
primes_class_simple_gt1
Burnside_p_a_q_bgT (G : {group gT}) : (size (primes #|G|) <= 2)%N -> solvable G. Proof. move: {2}_.+1 (ltnSn #|G|) => n; elim: n => // n IHn in gT G *. rewrite ltnS => leGn piGle2; have [simpleG | ] := boolP (simple G); last first. rewrite negb_forall_in => /exists_inP[N sNG]; rewrite eq_sym. have [->|] := eqVneq N G. rewrite groupP /= genGid normG andbT eqb_id negbK => /eqP->. exact: solvable1. rewrite [N == G]eqEproper sNG eqbF_neg !negbK => ltNG /and3P[grN]. case/isgroupP: grN => {}N -> in sNG ltNG *; rewrite /= genGid => ntN nNG. have nsNG: N <| G by apply/andP. have dv_le_pi m: (m %| #|G| -> size (primes m) <= 2)%N. move=> m_dv_G; apply: leq_trans piGle2. by rewrite uniq_leq_size ?primes_uniq //; apply: pi_of_dvd. rewrite (series_sol nsNG) !IHn ?dv_le_pi ?cardSg ?dvdn_quotient //. by apply: leq_trans leGn; apply: ltn_quotient. by apply: leq_trans leGn; apply: proper_card. have [->|[p p_pr p_dv_G]] := trivgVpdiv G; first exact: solvable1. have piGp: p \in \pi(G) by rewrite mem_primes p_pr cardG_gt0. have [P sylP] := Sylow_exists p G; have [sPG pP p'GP] := and3P sylP. have ntP: P :!=: 1%g by rewrite -rank_gt0 (rank_Sylow sylP) p_rank_gt0. have /trivgPn[g /setIP[Pg cPg] nt_g]: 'Z(P) != 1%g. by rewrite center_nil_eq1 // (pgroup_nil pP). apply: abelian_sol; have: (size (primes #|g ^: G|) <= 1)%N. rewrite -ltnS -[_.+1]/(size (p :: _)) (leq_trans _ piGle2) //. rewrite -index_cent1 uniq_leq_size // => [/= | q]. rewrite primes_uniq -p'natEpi ?(pnat ...
Theorem
character
[ "From HB Require Import structures", "From mathcomp Require Import ssreflect ssrbool ssrfun eqtype ssrnat seq path", "From mathcomp Require Import div choice fintype tuple finfun bigop prime order", "From mathcomp Require Import ssralg poly finset fingroup morphism perm", "From mathcomp Require Import autom...
character/integral_char.v
Burnside_p_a_q_b
dvd_irr1_cardGgT (G : {group gT}) i : ('chi[G]_i 1%g %| #|G|)%C. Proof. rewrite unfold_in -if_neg irr1_neq0 Cint_rat_Aint //=. by rewrite rpred_div ?rpred_nat // rpred_nat_num ?Cnat_irr1. rewrite -[n in n / _]/(_ *+ true) -(eqxx i) -mulr_natr. rewrite -first_orthogonality_relation mulVKf ?neq0CG //. rewrite sum_by_classes => [|x y Gx Gy]; rewrite -?conjVg ?cfunJ //. rewrite mulr_suml rpred_sum // => K /repr_classesP[Gx {1}->]. by rewrite !mulrA mulrAC rpredM ?Aint_irr ?Aint_class_div_irr1. Qed.
Theorem
character
[ "From HB Require Import structures", "From mathcomp Require Import ssreflect ssrbool ssrfun eqtype ssrnat seq path", "From mathcomp Require Import div choice fintype tuple finfun bigop prime order", "From mathcomp Require Import ssralg poly finset fingroup morphism perm", "From mathcomp Require Import autom...
character/integral_char.v
dvd_irr1_cardG
dvd_irr1_index_centergT (G : {group gT}) i : ('chi[G]_i 1%g %| #|G : 'Z('chi_i)%CF|)%C. Proof. without loss fful: gT G i / cfaithful 'chi_i. rewrite -{2}[i](quo_IirrK _ (subxx _)) 1?mod_IirrE ?cfModE ?cfker_normal //. rewrite morph1; set i1 := quo_Iirr _ i => /(_ _ _ i1) IH. have fful_i1: cfaithful 'chi_i1. by rewrite quo_IirrE ?cfker_normal ?cfaithful_quo. have:= IH fful_i1; rewrite cfcenter_fful_irr // -cfcenter_eq_center. rewrite index_quotient_eq ?cfcenter_sub ?cfker_norm //. by rewrite setIC subIset // normal_sub ?cfker_center_normal. have [lambda lin_lambda Dlambda] := cfcenter_Res 'chi_i. have DchiZ: {in G & 'Z(G), forall x y, 'chi_i (x * y)%g = 'chi_i x * lambda y}. rewrite -(cfcenter_fful_irr fful) => x y Gx Zy. apply: (mulfI (irr1_neq0 i)); rewrite mulrCA. transitivity ('chi_i x * ('chi_i 1%g *: lambda) y); last by rewrite !cfunE. rewrite -Dlambda cfResE ?cfcenter_sub //. rewrite -irrRepr cfcenter_repr !cfunE in Zy *. case/setIdP: Zy => Gy /is_scalar_mxP[e De]. rewrite repr_mx1 group1 (groupM Gx Gy) (repr_mxM _ Gx Gy) Gx Gy De. by rewrite mul_mx_scalar mxtraceZ mulrCA mulrA mulrC -mxtraceZ scalemx1. have inj_lambda: {in 'Z(G) &, injective lambda}. rewrite -(cfcenter_fful_irr fful) => x y Zx Zy eq_xy. apply/eqP; rewrite eq_mulVg1 -in_set1 (subsetP fful) // cfkerEirr inE. apply/eqP; transitivity ('Res['Z('chi_i)%CF] 'chi_i (x^-1 * y)%g). by rewrite cfResE ?cfcenter_sub // groupM ?groupV. rewrite Dlambda !cfunE lin_charM ?groupV // -eq_xy -lin_ ...
Theorem
character
[ "From HB Require Import structures", "From mathcomp Require Import ssreflect ssrbool ssrfun eqtype ssrnat seq path", "From mathcomp Require Import div choice fintype tuple finfun bigop prime order", "From mathcomp Require Import ssralg poly finset fingroup morphism perm", "From mathcomp Require Import autom...
character/integral_char.v
dvd_irr1_index_center
gring_classM_coef_sum_eqgT (G : {group gT}) j1 j2 k g1 g2 g : let a := @gring_classM_coef gT G j1 j2 in let a_k := a k in g1 \in enum_val j1 -> g2 \in enum_val j2 -> g \in enum_val k -> let sum12g := \sum_i 'chi[G]_i g1 * 'chi_i g2 * ('chi_i g)^* / 'chi_i 1%g in a_k%:R = (#|enum_val j1| * #|enum_val j2|)%:R / #|G|%:R * sum12g. Proof. move=> a /= Kg1 Kg2 Kg; rewrite mulrAC; apply: canRL (mulfK (neq0CG G)) _. transitivity (\sum_j (#|G| * a j)%:R *+ (j == k) : algC). by rewrite (bigD1 k) //= eqxx -natrM mulnC big1 ?addr0 // => j /negPf->. have defK (j : 'I_#|classes G|) x: x \in enum_val j -> enum_val j = x ^: G. by have /imsetP[y Gy ->] := enum_valP j => /class_eqP. have Gg: g \in G. by case/imsetP: (enum_valP k) Kg => x Gx -> /imsetP[y Gy ->]; apply: groupJ. transitivity (\sum_j \sum_i 'omega_i['K_j] * 'chi_i 1%g * ('chi_i g)^* *+ a j). apply: eq_bigr => j _; have /imsetP[z Gz Dj] := enum_valP j. have Kz: z \in enum_val j by rewrite Dj class_refl. rewrite -(Lagrange (subsetIl G 'C[z])) index_cent1 -mulnA natrM -mulrnAl. have ->: (j == k) = (z \in enum_val k). by rewrite -(inj_eq enum_val_inj); apply/eqP/idP=> [<-|/defK->]. rewrite (defK _ g) // -second_orthogonality_relation // mulr_suml. apply: eq_bigr=> i _; rewrite natrM mulrA mulr_natr mulrC mulrA. by rewrite (gring_mode_class_sum_eq i Kz) divfK ?irr1_neq0. rewrite exchange_big /= mulr_sumr; apply: eq_bigr => i _. transitivity ('omega_i['K_j1 *m 'K_j2] * 'chi_i 1%g * ('chi_i g)^*). rewrite gring_classM_expansi ...
Lemma
character
[ "From HB Require Import structures", "From mathcomp Require Import ssreflect ssrbool ssrfun eqtype ssrnat seq path", "From mathcomp Require Import div choice fintype tuple finfun bigop prime order", "From mathcomp Require Import ssralg poly finset fingroup morphism perm", "From mathcomp Require Import autom...
character/integral_char.v
gring_classM_coef_sum_eq
index_support_dvd_degreegT (G H : {group gT}) chi : H \subset G -> chi \is a character -> chi \in 'CF(G, H) -> (H :==: 1%g) || abelian G -> (#|G : H| %| chi 1%g)%C. Proof. move=> sHG Nchi Hchi ZHG. suffices: (#|G : H| %| 'Res[H] chi 1%g)%C by rewrite cfResE ?group1. rewrite ['Res _]cfun_sum_cfdot sum_cfunE rpred_sum // => i _. rewrite cfunE dvdC_mulr ?intr_nat ?Cnat_irr1 //. have [j ->]: exists j, 'chi_i = 'Res 'chi[G]_j. case/predU1P: ZHG => [-> | cGG] in i *. suffices ->: i = 0 by exists 0; rewrite !irr0 cfRes_cfun1 ?sub1G. apply/val_inj; case: i => [[|i] //=]; rewrite ltnNge NirrE. by rewrite (@leq_trans 1) // leqNgt classes_gt1 eqxx. have linG := char_abelianP G cGG; have linG1 j := eqP (proj2 (andP (linG j))). have /fin_all_exists[rH DrH] j: exists k, 'Res[H, G] 'chi_j = 'chi_k. apply/irrP/lin_char_irr/andP. by rewrite cfRes_char ?irr_char // cfRes1 ?linG1. suffices{i} all_rH: codom rH =i Iirr H. by exists (iinv (all_rH i)); rewrite DrH f_iinv. apply/subset_cardP; last exact/subsetP; apply/esym/eqP. rewrite card_Iirr_abelian ?(abelianS sHG) //. rewrite -(eqn_pmul2r (indexg_gt0 G H)) Lagrange //; apply/eqP. rewrite -sum_nat_const -card_Iirr_abelian // -sum1_card. rewrite (partition_big rH [in codom rH]) /=; last exact: image_f. have nsHG: H <| G by rewrite -sub_abelian_normal. apply: eq_bigr => _ /codomP[i ->]; rewrite -card_quotient ?normal_norm //. rewrite -card_Iirr_abelian ?quotient_abelian //. have Mlin j1 j2: exists k, 'chi_j1 * ' ...
Lemma
character
[ "From HB Require Import structures", "From mathcomp Require Import ssreflect ssrbool ssrfun eqtype ssrnat seq path", "From mathcomp Require Import div choice fintype tuple finfun bigop prime order", "From mathcomp Require Import ssralg poly finset fingroup morphism perm", "From mathcomp Require Import autom...
character/integral_char.v
index_support_dvd_degree
faithful_degree_p_partgT (p : nat) (G P : {group gT}) i : cfaithful 'chi[G]_i -> p.-nat (Num.truncn ('chi_i 1%g)) -> p.-Sylow(G) P -> abelian P -> 'chi_i 1%g = (#|G : 'Z(G)|`_p)%:R. Proof. have [p_pr | pr'p] := boolP (prime p); last first. have p'n n: (n > 0)%N -> p^'.-nat n. by move/p'natEpi->; rewrite mem_primes (negPf pr'p). rewrite irr1_degree natrK => _ /pnat_1-> => [_ _|]. by rewrite part_p'nat ?p'n. by rewrite p'n ?irr_degree_gt0. move=> fful_i /p_natP[a Dchi1] sylP cPP. have Dchi1C: 'chi_i 1%g = (p ^ a)%:R by rewrite -Dchi1 irr1_degree natrK. have pa_dv_ZiG: (p ^ a %| #|G : 'Z(G)|)%N. rewrite -dvdC_nat -[pa in (pa %| _)%C]Dchi1C -(cfcenter_fful_irr fful_i). exact: dvd_irr1_index_center. have [sPG pP p'PiG] := and3P sylP. have ZchiP: 'Res[P] 'chi_i \in 'CF(P, P :&: 'Z(G)). apply/cfun_onP=> x /[1!inE]; have [Px | /cfun0->//] := boolP (x \in P). rewrite /= -(cfcenter_fful_irr fful_i) cfResE //. apply: coprime_degree_support_cfcenter. rewrite Dchi1 coprimeXl // prime_coprime // -p'natE //. apply: pnat_dvd p'PiG; rewrite -index_cent1 indexgS // subsetI sPG. by rewrite sub_cent1 (subsetP cPP). have /andP[_ nZG] := center_normal G; have nZP := subset_trans sPG nZG. apply/eqP; rewrite Dchi1C eqr_nat eqn_dvd -{1}(pfactorK a p_pr) -p_part. rewrite partn_dvd //= -dvdC_nat -[pa in (_ %| pa)%C]Dchi1C -card_quotient //=. rewrite -(card_Hall (quotient_pHall nZP sylP)) card_quotient // -indexgI. rewrite -(cfResE _ sPG) // index_support_dvd_degree ?subsetIl ?cPP ?orb ...
Theorem
character
[ "From HB Require Import structures", "From mathcomp Require Import ssreflect ssrbool ssrfun eqtype ssrnat seq path", "From mathcomp Require Import div choice fintype tuple finfun bigop prime order", "From mathcomp Require Import ssralg poly finset fingroup morphism perm", "From mathcomp Require Import autom...
character/integral_char.v
faithful_degree_p_part
sum_norm2_char_generatorsgT (G : {group gT}) (chi : 'CF(G)) : let S := [pred s | generator G s] in chi \is a character -> {in S, forall s, chi s != 0} -> \sum_(s in S) `|chi s| ^+ 2 >= #|S|%:R. Proof. move=> S Nchi nz_chi_S; pose n := #|G|. have [g Sg | S_0] := pickP (generator G); last first. by rewrite eq_card0 // big_pred0 ?lerr. have defG: <[g]> = G by apply/esym/eqP. have [cycG Gg]: cyclic G /\ g \in G by rewrite -defG cycle_cyclic cycle_id. pose I := {k : 'I_n | coprime n k}; pose ItoS (k : I) := (g ^+ sval k)%g. have imItoS: codom ItoS =i S. move=> s; rewrite inE /= /ItoS /I /n /S -defG -orderE. apply/codomP/idP=> [[[i cogi] ->] | Ss]; first by rewrite generator_coprime. have [m ltmg Ds] := cyclePmin (cycle_generator Ss). by rewrite Ds generator_coprime in Ss; apply: ex_intro (Sub (Sub m _) _) _. have /injectiveP injItoS: injective ItoS. move=> k1 k2 /eqP; apply: contraTeq. by rewrite eq_expg_mod_order orderE defG -/n !modn_small. have [Qn galQn [QnC gQnC [eps [pr_eps defQn] QnG]]] := group_num_field_exists G. have{QnG} QnGg := QnG _ G _ _ g (order_dvdG Gg). pose calG := 'Gal({:Qn} / 1). have /fin_all_exists2[ItoQ inItoQ defItoQ] (k : I): exists2 nu, nu \in calG & nu eps = eps ^+ val k. - case: k => [[m _] /=]; rewrite coprime_sym => /Qn_aut_exists[nuC DnuC]. have [nuQ DnuQ] := restrict_aut_to_normal_num_field QnC nuC. have hom_nu: kHom 1 {:Qn} (linfun nuQ). rewrite k1HomE; apply/ahom_inP. by split=> [u v | ]; rewrite !lfunE ?rmorphM ?rmorph1. have [|nu ...
Lemma
character
[ "From HB Require Import structures", "From mathcomp Require Import ssreflect ssrbool ssrfun eqtype ssrnat seq path", "From mathcomp Require Import div choice fintype tuple finfun bigop prime order", "From mathcomp Require Import ssralg poly finset fingroup morphism perm", "From mathcomp Require Import autom...
character/integral_char.v
sum_norm2_char_generators
nonlinear_irr_vanishgT (G : {group gT}) i : 'chi[G]_i 1%g > 1 -> exists2 x, x \in G & 'chi_i x = 0. Proof. move=> chi1gt1; apply/exists_eq_inP; apply: contraFT (lt_geF chi1gt1). move=> /exists_inPn-nz_chi. rewrite -(norm_natr (Cnat_irr1 i)) -(@expr_le1 _ 2)//. rewrite -(lerD2r (#|G|%:R * '['chi_i])) {1}cfnorm_irr mulr1. rewrite (cfnormE (cfun_onG _)) mulVKf ?neq0CG // (big_setD1 1%g) //=. rewrite addrCA lerD2l (cardsD1 1%g) group1 mulrS lerD2l. rewrite -sumr_const !(partition_big_imset (fun s => <[s]>)) /=. apply: ler_sum => _ /imsetP[g /setD1P[ntg Gg] ->]. have sgG: <[g]> \subset G by rewrite cycle_subG. pose S := [pred s | generator <[g]> s]; pose chi := 'Res[<[g]>] 'chi_i. have defS: [pred s in G^# | <[s]> == <[g]>] =i S. move=> s; rewrite inE /= eq_sym andb_idl // !inE -cycle_eq1 -cycle_subG. by move/eqP <-; rewrite cycle_eq1 ntg. have resS: {in S, 'chi_i =1 chi}. by move=> s /cycle_generator=> g_s; rewrite cfResE ?cycle_subG. rewrite !(eq_bigl _ _ defS) sumr_const. rewrite (eq_bigr (fun s => `|chi s| ^+ 2)) => [|s /resS-> //]. apply: sum_norm2_char_generators => [|s Ss]. by rewrite cfRes_char ?irr_char. by rewrite -resS // nz_chi ?(subsetP sgG) ?cycle_generator. Qed.
Theorem
character
[ "From HB Require Import structures", "From mathcomp Require Import ssreflect ssrbool ssrfun eqtype ssrnat seq path", "From mathcomp Require Import div choice fintype tuple finfun bigop prime order", "From mathcomp Require Import ssralg poly finset fingroup morphism perm", "From mathcomp Require Import autom...
character/integral_char.v
nonlinear_irr_vanish
mx_repr_act(u : 'rV_n) x := u *m rG (val (subg G x)).
Definition
character
[ "From HB Require Import structures", "From mathcomp Require Import ssreflect ssrbool ssrfun eqtype ssrnat seq path", "From mathcomp Require Import div choice fintype tuple finfun bigop prime", "From mathcomp Require Import ssralg poly finset fingroup morphism perm", "From mathcomp Require Import automorphis...
character/mxabelem.v
mx_repr_act
mx_repr_actEu x : x \in G -> mx_repr_act u x = u *m rG x. Proof. by move=> Gx; rewrite /mx_repr_act /= subgK. Qed. Fact mx_repr_is_action : is_action G mx_repr_act. Proof. split=> [x | u x y Gx Gy]; first exact: can_inj (repr_mxK _ (subgP _)). by rewrite !mx_repr_actE ?groupM // -mulmxA repr_mxM. Qed.
Lemma
character
[ "From HB Require Import structures", "From mathcomp Require Import ssreflect ssrbool ssrfun eqtype ssrnat seq path", "From mathcomp Require Import div choice fintype tuple finfun bigop prime", "From mathcomp Require Import ssralg poly finset fingroup morphism perm", "From mathcomp Require Import automorphis...
character/mxabelem.v
mx_repr_actE
Structuremx_repr_action := Action mx_repr_is_action. Fact mx_repr_is_groupAction : is_groupAction [set: 'rV[R]_n] mx_repr_action. Proof. move=> x Gx /[!inE]; apply/andP; split; first by apply/subsetP=> u /[!inE]. by apply/morphicP=> /= u v _ _; rewrite !actpermE /= /mx_repr_act mulmxDl. Qed.
Canonical
character
[ "From HB Require Import structures", "From mathcomp Require Import ssreflect ssrbool ssrfun eqtype ssrnat seq path", "From mathcomp Require Import div choice fintype tuple finfun bigop prime", "From mathcomp Require Import ssralg poly finset fingroup morphism perm", "From mathcomp Require Import automorphis...
character/mxabelem.v
Structure
Structuremx_repr_groupAction := GroupAction mx_repr_is_groupAction.
Canonical
character
[ "From HB Require Import structures", "From mathcomp Require Import ssreflect ssrbool ssrfun eqtype ssrnat seq path", "From mathcomp Require Import div choice fintype tuple finfun bigop prime", "From mathcomp Require Import ssralg poly finset fingroup morphism perm", "From mathcomp Require Import automorphis...
character/mxabelem.v
Structure
scale_act(A : 'M[F]_(m, n)) (a : {unit F}) := val a *: A.
Definition
character
[ "From HB Require Import structures", "From mathcomp Require Import ssreflect ssrbool ssrfun eqtype ssrnat seq path", "From mathcomp Require Import div choice fintype tuple finfun bigop prime", "From mathcomp Require Import ssralg poly finset fingroup morphism perm", "From mathcomp Require Import automorphis...
character/mxabelem.v
scale_act
scale_actEA a : scale_act A a = val a *: A. Proof. by []. Qed. Fact scale_is_action : is_action setT scale_act. Proof. apply: is_total_action=> [A | A a b]; rewrite /scale_act ?scale1r //. by rewrite ?scalerA mulrC. Qed.
Lemma
character
[ "From HB Require Import structures", "From mathcomp Require Import ssreflect ssrbool ssrfun eqtype ssrnat seq path", "From mathcomp Require Import div choice fintype tuple finfun bigop prime", "From mathcomp Require Import ssralg poly finset fingroup morphism perm", "From mathcomp Require Import automorphis...
character/mxabelem.v
scale_actE
scale_action:= Action scale_is_action. Fact scale_is_groupAction : is_groupAction setT scale_action. Proof. move=> a _ /[1!inE]; apply/andP; split; first by apply/subsetP=> A /[!inE]. by apply/morphicP=> u A _ _ /=; rewrite !actpermE /= /scale_act scalerDr. Qed.
Canonical
character
[ "From HB Require Import structures", "From mathcomp Require Import ssreflect ssrbool ssrfun eqtype ssrnat seq path", "From mathcomp Require Import div choice fintype tuple finfun bigop prime", "From mathcomp Require Import ssralg poly finset fingroup morphism perm", "From mathcomp Require Import automorphis...
character/mxabelem.v
scale_action
scale_groupAction:= GroupAction scale_is_groupAction.
Canonical
character
[ "From HB Require Import structures", "From mathcomp Require Import ssreflect ssrbool ssrfun eqtype ssrnat seq path", "From mathcomp Require Import div choice fintype tuple finfun bigop prime", "From mathcomp Require Import ssralg poly finset fingroup morphism perm", "From mathcomp Require Import automorphis...
character/mxabelem.v
scale_groupAction
astab1_scale_actA : A != 0 -> 'C[A | scale_action] = 1%g. Proof. rewrite -mxrank_eq0=> nzA; apply/trivgP/subsetP=> a; apply: contraLR. rewrite !inE -val_eqE -subr_eq0 sub1set !inE => nz_a1. by rewrite -subr_eq0 -scaleN1r -scalerDl -mxrank_eq0 eqmx_scale. Qed.
Lemma
character
[ "From HB Require Import structures", "From mathcomp Require Import ssreflect ssrbool ssrfun eqtype ssrnat seq path", "From mathcomp Require Import div choice fintype tuple finfun bigop prime", "From mathcomp Require Import ssralg poly finset fingroup morphism perm", "From mathcomp Require Import automorphis...
character/mxabelem.v
astab1_scale_act
rowgm (A : 'M[F]_(m, n)) : {set rVn} := [set u | u <= A]%MS.
Definition
character
[ "From HB Require Import structures", "From mathcomp Require Import ssreflect ssrbool ssrfun eqtype ssrnat seq path", "From mathcomp Require Import div choice fintype tuple finfun bigop prime", "From mathcomp Require Import ssralg poly finset fingroup morphism perm", "From mathcomp Require Import automorphis...
character/mxabelem.v
rowg
mem_rowgm A v : (v \in @rowg m A) = (v <= A)%MS. Proof. by rewrite inE. Qed. Fact rowg_group_set m A : group_set (@rowg m A). Proof. by apply/group_setP; split=> [|u v]; rewrite !inE ?sub0mx //; apply: addmx_sub. Qed.
Lemma
character
[ "From HB Require Import structures", "From mathcomp Require Import ssreflect ssrbool ssrfun eqtype ssrnat seq path", "From mathcomp Require Import div choice fintype tuple finfun bigop prime", "From mathcomp Require Import ssralg poly finset fingroup morphism perm", "From mathcomp Require Import automorphis...
character/mxabelem.v
mem_rowg
rowg_groupm A := Group (@rowg_group_set m A).
Canonical
character
[ "From HB Require Import structures", "From mathcomp Require Import ssreflect ssrbool ssrfun eqtype ssrnat seq path", "From mathcomp Require Import div choice fintype tuple finfun bigop prime", "From mathcomp Require Import ssralg poly finset fingroup morphism perm", "From mathcomp Require Import automorphis...
character/mxabelem.v
rowg_group
rowg_stablem (A : 'M_(m, n)) : [acts setT, on rowg A | 'Zm]. Proof. by apply/actsP=> a _ v; rewrite !inE eqmx_scale // -unitfE (valP a). Qed.
Lemma
character
[ "From HB Require Import structures", "From mathcomp Require Import ssreflect ssrbool ssrfun eqtype ssrnat seq path", "From mathcomp Require Import div choice fintype tuple finfun bigop prime", "From mathcomp Require Import ssralg poly finset fingroup morphism perm", "From mathcomp Require Import automorphis...
character/mxabelem.v
rowg_stable
rowgSm1 m2 (A : 'M_(m1, n)) (B : 'M_(m2, n)) : (rowg A \subset rowg B) = (A <= B)%MS. Proof. apply/subsetP/idP=> sAB => [|u /[!inE] suA]; last exact: submx_trans sAB. by apply/row_subP=> i; have /[!(inE, row_sub)]-> := sAB (row i A). Qed.
Lemma
character
[ "From HB Require Import structures", "From mathcomp Require Import ssreflect ssrbool ssrfun eqtype ssrnat seq path", "From mathcomp Require Import div choice fintype tuple finfun bigop prime", "From mathcomp Require Import ssralg poly finset fingroup morphism perm", "From mathcomp Require Import automorphis...
character/mxabelem.v
rowgS
eq_rowgm1 m2 (A : 'M_(m1, n)) (B : 'M_(m2, n)) : (A :=: B)%MS -> rowg A = rowg B. Proof. by move=> eqAB; apply/eqP; rewrite eqEsubset !rowgS !eqAB andbb. Qed.
Lemma
character
[ "From HB Require Import structures", "From mathcomp Require Import ssreflect ssrbool ssrfun eqtype ssrnat seq path", "From mathcomp Require Import div choice fintype tuple finfun bigop prime", "From mathcomp Require Import ssralg poly finset fingroup morphism perm", "From mathcomp Require Import automorphis...
character/mxabelem.v
eq_rowg
rowg0m : rowg (0 : 'M_(m, n)) = 1%g. Proof. by apply/trivgP/subsetP=> v; rewrite !inE eqmx0 submx0. Qed.
Lemma
character
[ "From HB Require Import structures", "From mathcomp Require Import ssreflect ssrbool ssrfun eqtype ssrnat seq path", "From mathcomp Require Import div choice fintype tuple finfun bigop prime", "From mathcomp Require Import ssralg poly finset fingroup morphism perm", "From mathcomp Require Import automorphis...
character/mxabelem.v
rowg0
rowg1: rowg 1%:M = setT. Proof. by apply/setP=> x; rewrite !inE submx1. Qed.
Lemma
character
[ "From HB Require Import structures", "From mathcomp Require Import ssreflect ssrbool ssrfun eqtype ssrnat seq path", "From mathcomp Require Import div choice fintype tuple finfun bigop prime", "From mathcomp Require Import ssralg poly finset fingroup morphism perm", "From mathcomp Require Import automorphis...
character/mxabelem.v
rowg1
trivg_rowgm (A : 'M_(m, n)) : (rowg A == 1%g) = (A == 0). Proof. by rewrite -submx0 -rowgS rowg0 (sameP trivgP eqP). Qed.
Lemma
character
[ "From HB Require Import structures", "From mathcomp Require Import ssreflect ssrbool ssrfun eqtype ssrnat seq path", "From mathcomp Require Import div choice fintype tuple finfun bigop prime", "From mathcomp Require Import ssralg poly finset fingroup morphism perm", "From mathcomp Require Import automorphis...
character/mxabelem.v
trivg_rowg
rowg_mx(L : {set rVn}) := <<\matrix_(i < #|L|) enum_val i>>%MS.
Definition
character
[ "From HB Require Import structures", "From mathcomp Require Import ssreflect ssrbool ssrfun eqtype ssrnat seq path", "From mathcomp Require Import div choice fintype tuple finfun bigop prime", "From mathcomp Require Import ssralg poly finset fingroup morphism perm", "From mathcomp Require Import automorphis...
character/mxabelem.v
rowg_mx
rowgKm (A : 'M_(m, n)) : (rowg_mx (rowg A) :=: A)%MS. Proof. apply/eqmxP; rewrite !genmxE; apply/andP; split. by apply/row_subP=> i; rewrite rowK; have /[!inE] := enum_valP i. apply/row_subP=> i; set v := row i A. have Av: v \in rowg A by rewrite inE row_sub. by rewrite (eq_row_sub (enum_rank_in Av v)) // rowK enum_rankK_in. Qed.
Lemma
character
[ "From HB Require Import structures", "From mathcomp Require Import ssreflect ssrbool ssrfun eqtype ssrnat seq path", "From mathcomp Require Import div choice fintype tuple finfun bigop prime", "From mathcomp Require Import ssralg poly finset fingroup morphism perm", "From mathcomp Require Import automorphis...
character/mxabelem.v
rowgK
rowg_mxS(L M : {set 'rV[F]_n}) : L \subset M -> (rowg_mx L <= rowg_mx M)%MS. Proof. move/subsetP=> sLM; rewrite !genmxE; apply/row_subP=> i. rewrite rowK; move: (enum_val i) (sLM _ (enum_valP i)) => v Mv. by rewrite (eq_row_sub (enum_rank_in Mv v)) // rowK enum_rankK_in. Qed.
Lemma
character
[ "From HB Require Import structures", "From mathcomp Require Import ssreflect ssrbool ssrfun eqtype ssrnat seq path", "From mathcomp Require Import div choice fintype tuple finfun bigop prime", "From mathcomp Require Import ssralg poly finset fingroup morphism perm", "From mathcomp Require Import automorphis...
character/mxabelem.v
rowg_mxS
sub_rowg_mx(L : {set rVn}) : L \subset rowg (rowg_mx L). Proof. apply/subsetP=> v Lv; rewrite inE genmxE. by rewrite (eq_row_sub (enum_rank_in Lv v)) // rowK enum_rankK_in. Qed.
Lemma
character
[ "From HB Require Import structures", "From mathcomp Require Import ssreflect ssrbool ssrfun eqtype ssrnat seq path", "From mathcomp Require Import div choice fintype tuple finfun bigop prime", "From mathcomp Require Import ssralg poly finset fingroup morphism perm", "From mathcomp Require Import automorphis...
character/mxabelem.v
sub_rowg_mx
stable_rowg_mxK(L : {group rVn}) : [acts setT, on L | 'Zm] -> rowg (rowg_mx L) = L. Proof. move=> linL; apply/eqP; rewrite eqEsubset sub_rowg_mx andbT. apply/subsetP=> v; rewrite inE genmxE => /submxP[u ->{v}]. rewrite mulmx_sum_row group_prod // => i _. rewrite rowK; move: (enum_val i) (enum_valP i) => v Lv. have [->|] := eqVneq (u 0 i) 0; first by rewrite scale0r group1. by rewrite -unitfE => aP; rewrite ((actsP linL) (FinRing.Unit aP)) ?inE. Qed.
Lemma
character
[ "From HB Require Import structures", "From mathcomp Require Import ssreflect ssrbool ssrfun eqtype ssrnat seq path", "From mathcomp Require Import div choice fintype tuple finfun bigop prime", "From mathcomp Require Import ssralg poly finset fingroup morphism perm", "From mathcomp Require Import automorphis...
character/mxabelem.v
stable_rowg_mxK
rowg_mx1: rowg_mx 1%g = 0. Proof. by apply/eqP; rewrite -submx0 -(rowg0 0) rowgK sub0mx. Qed.
Lemma
character
[ "From HB Require Import structures", "From mathcomp Require Import ssreflect ssrbool ssrfun eqtype ssrnat seq path", "From mathcomp Require Import div choice fintype tuple finfun bigop prime", "From mathcomp Require Import ssralg poly finset fingroup morphism perm", "From mathcomp Require Import automorphis...
character/mxabelem.v
rowg_mx1
rowg_mx_eq0(L : {group rVn}) : (rowg_mx L == 0) = (L :==: 1%g). Proof. rewrite -trivg_rowg; apply/idP/eqP=> [|->]; last by rewrite rowg_mx1 rowg0. exact/contraTeq/subG1_contra/sub_rowg_mx. Qed.
Lemma
character
[ "From HB Require Import structures", "From mathcomp Require Import ssreflect ssrbool ssrfun eqtype ssrnat seq path", "From mathcomp Require Import div choice fintype tuple finfun bigop prime", "From mathcomp Require Import ssralg poly finset fingroup morphism perm", "From mathcomp Require Import automorphis...
character/mxabelem.v
rowg_mx_eq0
rowgIm1 m2 (A : 'M_(m1, n)) (B : 'M_(m2, n)) : rowg (A :&: B)%MS = rowg A :&: rowg B. Proof. by apply/setP=> u; rewrite !inE sub_capmx. Qed.
Lemma
character
[ "From HB Require Import structures", "From mathcomp Require Import ssreflect ssrbool ssrfun eqtype ssrnat seq path", "From mathcomp Require Import div choice fintype tuple finfun bigop prime", "From mathcomp Require Import ssralg poly finset fingroup morphism perm", "From mathcomp Require Import automorphis...
character/mxabelem.v
rowgI
card_rowgm (A : 'M_(m, n)) : #|rowg A| = (#|F| ^ \rank A)%N. Proof. rewrite -[\rank A]mul1n -card_mx. have injA: injective (mulmxr (row_base A)). have /row_freeP[A' A'K] := row_base_free A. by move=> ?; apply: can_inj (mulmxr A') _ => u; rewrite /= -mulmxA A'K mulmx1. rewrite -(card_image (injA _)); apply: eq_card => v. by rewrite inE -(eq_row_base A) (sameP submxP codomP). Qed.
Lemma
character
[ "From HB Require Import structures", "From mathcomp Require Import ssreflect ssrbool ssrfun eqtype ssrnat seq path", "From mathcomp Require Import div choice fintype tuple finfun bigop prime", "From mathcomp Require Import ssralg poly finset fingroup morphism perm", "From mathcomp Require Import automorphis...
character/mxabelem.v
card_rowg
rowgDm1 m2 (A : 'M_(m1, n)) (B : 'M_(m2, n)) : rowg (A + B)%MS = (rowg A * rowg B)%g. Proof. apply/eqP; rewrite eq_sym eqEcard mulG_subG /= !rowgS. rewrite addsmxSl addsmxSr -(@leq_pmul2r #|rowg A :&: rowg B|) ?cardG_gt0 //=. by rewrite -mul_cardG -rowgI !card_rowg -!expnD mxrank_sum_cap. Qed.
Lemma
character
[ "From HB Require Import structures", "From mathcomp Require Import ssreflect ssrbool ssrfun eqtype ssrnat seq path", "From mathcomp Require Import div choice fintype tuple finfun bigop prime", "From mathcomp Require Import ssralg poly finset fingroup morphism perm", "From mathcomp Require Import automorphis...
character/mxabelem.v
rowgD
cprod_rowgm1 m2 (A : 'M_(m1, n)) (B : 'M_(m2, n)) : (rowg A \* rowg B)%g = rowg (A + B)%MS. Proof. by rewrite rowgD cprodE // (sub_abelian_cent2 (zmod_abelian setT)). Qed.
Lemma
character
[ "From HB Require Import structures", "From mathcomp Require Import ssreflect ssrbool ssrfun eqtype ssrnat seq path", "From mathcomp Require Import div choice fintype tuple finfun bigop prime", "From mathcomp Require Import ssralg poly finset fingroup morphism perm", "From mathcomp Require Import automorphis...
character/mxabelem.v
cprod_rowg
dprod_rowgm1 m2 (A : 'M[F]_(m1, n)) (B : 'M[F]_(m2, n)) : mxdirect (A + B) -> rowg A \x rowg B = rowg (A + B)%MS. Proof. rewrite (sameP mxdirect_addsP eqP) -trivg_rowg rowgI => /eqP tiAB. by rewrite -cprod_rowg dprodEcp. Qed.
Lemma
character
[ "From HB Require Import structures", "From mathcomp Require Import ssreflect ssrbool ssrfun eqtype ssrnat seq path", "From mathcomp Require Import div choice fintype tuple finfun bigop prime", "From mathcomp Require Import ssralg poly finset fingroup morphism perm", "From mathcomp Require Import automorphis...
character/mxabelem.v
dprod_rowg
bigcprod_rowgm I r (P : pred I) (A : I -> 'M[F]_n) (B : 'M[F]_(m, n)) : (\sum_(i <- r | P i) A i :=: B)%MS -> \big[cprod/1%g]_(i <- r | P i) rowg (A i) = rowg B. Proof. by move/eq_rowg <-; apply/esym/big_morph=> [? ?|]; rewrite (rowg0, cprod_rowg). Qed.
Lemma
character
[ "From HB Require Import structures", "From mathcomp Require Import ssreflect ssrbool ssrfun eqtype ssrnat seq path", "From mathcomp Require Import div choice fintype tuple finfun bigop prime", "From mathcomp Require Import ssralg poly finset fingroup morphism perm", "From mathcomp Require Import automorphis...
character/mxabelem.v
bigcprod_rowg
bigdprod_rowgm (I : finType) (P : pred I) A (B : 'M[F]_(m, n)) : let S := (\sum_(i | P i) A i)%MS in (S :=: B)%MS -> mxdirect S -> \big[dprod/1%g]_(i | P i) rowg (A i) = rowg B. Proof. move=> S defS; rewrite mxdirectE defS /= => /eqP rankB. apply: bigcprod_card_dprod (bigcprod_rowg defS) (eq_leq _). by rewrite card_rowg rankB expn_sum; apply: eq_bigr => i; rewrite card_rowg. Qed.
Lemma
character
[ "From HB Require Import structures", "From mathcomp Require Import ssreflect ssrbool ssrfun eqtype ssrnat seq path", "From mathcomp Require Import div choice fintype tuple finfun bigop prime", "From mathcomp Require Import ssralg poly finset fingroup morphism perm", "From mathcomp Require Import automorphis...
character/mxabelem.v
bigdprod_rowg
GLrepr:= MxRepresentation GL_mx_repr.
Canonical
character
[ "From HB Require Import structures", "From mathcomp Require Import ssreflect ssrbool ssrfun eqtype ssrnat seq path", "From mathcomp Require Import div choice fintype tuple finfun bigop prime", "From mathcomp Require Import ssralg poly finset fingroup morphism perm", "From mathcomp Require Import automorphis...
character/mxabelem.v
GLrepr
GLmx_faithful: mx_faithful GLrepr. Proof. by apply/subsetP=> A; rewrite !inE mul1mx. Qed.
Lemma
character
[ "From HB Require Import structures", "From mathcomp Require Import ssreflect ssrbool ssrfun eqtype ssrnat seq path", "From mathcomp Require Import div choice fintype tuple finfun bigop prime", "From mathcomp Require Import ssralg poly finset fingroup morphism perm", "From mathcomp Require Import automorphis...
character/mxabelem.v
GLmx_faithful
reprGLmx : {'GL_n[F]} := insubd (1%g : {'GL_n[F]}) (rG x).
Definition
character
[ "From HB Require Import structures", "From mathcomp Require Import ssreflect ssrbool ssrfun eqtype ssrnat seq path", "From mathcomp Require Import div choice fintype tuple finfun bigop prime", "From mathcomp Require Import ssralg poly finset fingroup morphism perm", "From mathcomp Require Import automorphis...
character/mxabelem.v
reprGLm
val_reprGLmx : x \in G -> val (reprGLm x) = rG x. Proof. by move=> Gx; rewrite val_insubd (repr_mx_unitr rG). Qed.
Lemma
character
[ "From HB Require Import structures", "From mathcomp Require Import ssreflect ssrbool ssrfun eqtype ssrnat seq path", "From mathcomp Require Import div choice fintype tuple finfun bigop prime", "From mathcomp Require Import ssralg poly finset fingroup morphism perm", "From mathcomp Require Import automorphis...
character/mxabelem.v
val_reprGLm
comp_reprGLm: {in G, GLval \o reprGLm =1 rG}. Proof. exact: val_reprGLm. Qed.
Lemma
character
[ "From HB Require Import structures", "From mathcomp Require Import ssreflect ssrbool ssrfun eqtype ssrnat seq path", "From mathcomp Require Import div choice fintype tuple finfun bigop prime", "From mathcomp Require Import ssralg poly finset fingroup morphism perm", "From mathcomp Require Import automorphis...
character/mxabelem.v
comp_reprGLm
reprGLmM: {in G &, {morph reprGLm : x y / x * y}}%g. Proof. by move=> x y Gx Gy; apply: val_inj; rewrite /= !val_reprGLm ?groupM ?repr_mxM. Qed.
Lemma
character
[ "From HB Require Import structures", "From mathcomp Require Import ssreflect ssrbool ssrfun eqtype ssrnat seq path", "From mathcomp Require Import div choice fintype tuple finfun bigop prime", "From mathcomp Require Import ssralg poly finset fingroup morphism perm", "From mathcomp Require Import automorphis...
character/mxabelem.v
reprGLmM
reprGL_morphism:= Morphism reprGLmM.
Canonical
character
[ "From HB Require Import structures", "From mathcomp Require Import ssreflect ssrbool ssrfun eqtype ssrnat seq path", "From mathcomp Require Import div choice fintype tuple finfun bigop prime", "From mathcomp Require Import ssralg poly finset fingroup morphism perm", "From mathcomp Require Import automorphis...
character/mxabelem.v
reprGL_morphism
ker_reprGLm: 'ker reprGLm = rker rG. Proof. apply/setP=> x; rewrite !inE mul1mx; apply: andb_id2l => Gx. by rewrite -val_eqE val_reprGLm. Qed.
Lemma
character
[ "From HB Require Import structures", "From mathcomp Require Import ssreflect ssrbool ssrfun eqtype ssrnat seq path", "From mathcomp Require Import div choice fintype tuple finfun bigop prime", "From mathcomp Require Import ssralg poly finset fingroup morphism perm", "From mathcomp Require Import automorphis...
character/mxabelem.v
ker_reprGLm
astab_rowg_reprm (A : 'M_(m, n)) : 'C(rowg A | 'MR rG) = rstab rG A. Proof. apply/setP=> x /[!inE]/=; apply: andb_id2l => Gx. apply/subsetP/eqP=> cAx => [|u]; last first. by rewrite !inE mx_repr_actE // => /submxP[u' ->]; rewrite -mulmxA cAx. apply/row_matrixP=> i; apply/eqP; move/implyP: (cAx (row i A)). by rewrite !inE row_sub mx_repr_actE //= row_mul. Qed.
Lemma
character
[ "From HB Require Import structures", "From mathcomp Require Import ssreflect ssrbool ssrfun eqtype ssrnat seq path", "From mathcomp Require Import div choice fintype tuple finfun bigop prime", "From mathcomp Require Import ssralg poly finset fingroup morphism perm", "From mathcomp Require Import automorphis...
character/mxabelem.v
astab_rowg_repr
astabs_rowg_reprm (A : 'M_(m, n)) : 'N(rowg A | 'MR rG) = rstabs rG A. Proof. apply/setP=> x /[!inE]/=; apply: andb_id2l => Gx. apply/subsetP/idP=> nAx => [|u]; last first. by rewrite !inE mx_repr_actE // => Au; apply: (submx_trans (submxMr _ Au)). apply/row_subP=> i; move/implyP: (nAx (row i A)). by rewrite !inE row_sub mx_repr_actE //= row_mul. Qed.
Lemma
character
[ "From HB Require Import structures", "From mathcomp Require Import ssreflect ssrbool ssrfun eqtype ssrnat seq path", "From mathcomp Require Import div choice fintype tuple finfun bigop prime", "From mathcomp Require Import ssralg poly finset fingroup morphism perm", "From mathcomp Require Import automorphis...
character/mxabelem.v
astabs_rowg_repr
acts_rowg(A : 'M_n) : [acts G, on rowg A | 'MR rG] = mxmodule rG A. Proof. by rewrite astabs_rowg_repr. Qed.
Lemma
character
[ "From HB Require Import structures", "From mathcomp Require Import ssreflect ssrbool ssrfun eqtype ssrnat seq path", "From mathcomp Require Import div choice fintype tuple finfun bigop prime", "From mathcomp Require Import ssralg poly finset fingroup morphism perm", "From mathcomp Require Import automorphis...
character/mxabelem.v
acts_rowg