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import Mathlib.Algebra.MonoidAlgebra.Division import Mathlib.Algebra.Polynomial.Degree.Definitions import Mathlib.Algebra.Polynomial.Induction import Mathlib.Algebra.Polynomial.EraseLead import Mathlib.Order.Interval.Finset.Nat #align_import data.polynomial.inductions from "leanprover-community/mathlib"@"57e09a1296bf...
Mathlib/Algebra/Polynomial/Inductions.lean
207
228
theorem natDegree_ne_zero_induction_on {M : R[X] → Prop} {f : R[X]} (f0 : f.natDegree ≠ 0) (h_C_add : ∀ {a p}, M p → M (C a + p)) (h_add : ∀ {p q}, M p → M q → M (p + q)) (h_monomial : ∀ {n : ℕ} {a : R}, a ≠ 0 → n ≠ 0 → M (monomial n a)) : M f := by
suffices f.natDegree = 0 ∨ M f from Or.recOn this (fun h => (f0 h).elim) id refine Polynomial.induction_on f ?_ ?_ ?_ · exact fun a => Or.inl (natDegree_C _) · rintro p q (hp | hp) (hq | hq) · refine Or.inl ?_ rw [eq_C_of_natDegree_eq_zero hp, eq_C_of_natDegree_eq_zero hq, ← C_add, natDegree_C] ·...
import Mathlib.Data.Nat.Factorial.Basic import Mathlib.Order.Monotone.Basic #align_import data.nat.choose.basic from "leanprover-community/mathlib"@"2f3994e1b117b1e1da49bcfb67334f33460c3ce4" open Nat namespace Nat def choose : ℕ → ℕ → ℕ | _, 0 => 1 | 0, _ + 1 => 0 | n + 1, k + 1 => choose n k + choose n ...
Mathlib/Data/Nat/Choose/Basic.lean
378
378
theorem multichoose_zero_right (n : ℕ) : multichoose n 0 = 1 := by
cases n <;> simp [multichoose]
import Mathlib.Analysis.SpecificLimits.Basic import Mathlib.Topology.MetricSpace.IsometricSMul #align_import topology.metric_space.hausdorff_distance from "leanprover-community/mathlib"@"bc91ed7093bf098d253401e69df601fc33dde156" noncomputable section open NNReal ENNReal Topology Set Filter Pointwise Bornology u...
Mathlib/Topology/MetricSpace/HausdorffDistance.lean
226
248
theorem _root_.IsOpen.exists_iUnion_isClosed {U : Set α} (hU : IsOpen U) : ∃ F : ℕ → Set α, (∀ n, IsClosed (F n)) ∧ (∀ n, F n ⊆ U) ∧ ⋃ n, F n = U ∧ Monotone F := by
obtain ⟨a, a_pos, a_lt_one⟩ : ∃ a : ℝ≥0∞, 0 < a ∧ a < 1 := exists_between zero_lt_one let F := fun n : ℕ => (fun x => infEdist x Uᶜ) ⁻¹' Ici (a ^ n) have F_subset : ∀ n, F n ⊆ U := fun n x hx ↦ by by_contra h have : infEdist x Uᶜ ≠ 0 := ((ENNReal.pow_pos a_pos _).trans_le hx).ne' exact this (infEdist...
import Mathlib.Algebra.BigOperators.GroupWithZero.Finset import Mathlib.Data.Finite.Card import Mathlib.GroupTheory.Finiteness import Mathlib.GroupTheory.GroupAction.Quotient #align_import group_theory.index from "leanprover-community/mathlib"@"dc6c365e751e34d100e80fe6e314c3c3e0fd2988" namespace Subgroup open Ca...
Mathlib/GroupTheory/Index.lean
507
510
theorem index_ne_zero_of_finite [hH : Finite (G ⧸ H)] : H.index ≠ 0 := by
cases nonempty_fintype (G ⧸ H) rw [index_eq_card] exact Fintype.card_ne_zero
import Mathlib.Algebra.BigOperators.Finsupp import Mathlib.Algebra.Module.Basic import Mathlib.Algebra.Regular.SMul import Mathlib.Data.Finset.Preimage import Mathlib.Data.Rat.BigOperators import Mathlib.GroupTheory.GroupAction.Hom import Mathlib.Data.Set.Subsingleton #align_import data.finsupp.basic from "leanprover...
Mathlib/Data/Finsupp/Basic.lean
78
80
theorem mem_graph_iff {c : α × M} {f : α →₀ M} : c ∈ f.graph ↔ f c.1 = c.2 ∧ c.2 ≠ 0 := by
cases c exact mk_mem_graph_iff
import Mathlib.Algebra.MvPolynomial.Rename #align_import data.mv_polynomial.comap from "leanprover-community/mathlib"@"aba31c938d3243cc671be7091b28a1e0814647ee" namespace MvPolynomial variable {σ : Type*} {τ : Type*} {υ : Type*} {R : Type*} [CommSemiring R] noncomputable def comap (f : MvPolynomial σ R →ₐ[R] M...
Mathlib/Algebra/MvPolynomial/Comap.lean
83
87
theorem comap_eq_id_of_eq_id (f : MvPolynomial σ R →ₐ[R] MvPolynomial σ R) (hf : ∀ φ, f φ = φ) (x : σ → R) : comap f x = x := by
convert comap_id_apply x ext1 φ simp [hf, AlgHom.id_apply]
import Mathlib.MeasureTheory.Covering.DensityTheorem #align_import measure_theory.covering.liminf_limsup from "leanprover-community/mathlib"@"5f6e827d81dfbeb6151d7016586ceeb0099b9655" open Set Filter Metric MeasureTheory TopologicalSpace open scoped NNReal ENNReal Topology variable {α : Type*} [MetricSpace α] [...
Mathlib/MeasureTheory/Covering/LiminfLimsup.lean
41
150
theorem blimsup_cthickening_ae_le_of_eventually_mul_le_aux (p : ℕ → Prop) {s : ℕ → Set α} (hs : ∀ i, IsClosed (s i)) {r₁ r₂ : ℕ → ℝ} (hr : Tendsto r₁ atTop (𝓝[>] 0)) (hrp : 0 ≤ r₁) {M : ℝ} (hM : 0 < M) (hM' : M < 1) (hMr : ∀ᶠ i in atTop, M * r₁ i ≤ r₂ i) : (blimsup (fun i => cthickening (r₁ i) (s i)) atTop...
/- Sketch of proof: Assume that `p` is identically true for simplicity. Let `Y₁ i = cthickening (r₁ i) (s i)`, define `Y₂` similarly except using `r₂`, and let `(Z i) = ⋃_{j ≥ i} (Y₂ j)`. Our goal is equivalent to showing that `μ ((limsup Y₁) \ (Z i)) = 0` for all `i`. Assume for contradiction that `μ ((li...
import Mathlib.SetTheory.Ordinal.Basic import Mathlib.Data.Nat.SuccPred #align_import set_theory.ordinal.arithmetic from "leanprover-community/mathlib"@"31b269b60935483943542d547a6dd83a66b37dc7" assert_not_exists Field assert_not_exists Module noncomputable section open Function Cardinal Set Equiv Order open sc...
Mathlib/SetTheory/Ordinal/Arithmetic.lean
1,977
1,983
theorem isNormal_iff_lt_succ_and_blsub_eq {f : Ordinal.{u} → Ordinal.{max u v}} : IsNormal f ↔ (∀ a, f a < f (succ a)) ∧ ∀ o, IsLimit o → (blsub.{_, v} o fun x _ => f x) = f o := by
rw [isNormal_iff_lt_succ_and_bsup_eq.{u, v}, and_congr_right_iff] intro h constructor <;> intro H o ho <;> have := H o ho <;> rwa [← bsup_eq_blsub_of_lt_succ_limit ho fun a _ => h a] at *
import Mathlib.Algebra.BigOperators.Fin import Mathlib.Algebra.Order.BigOperators.Group.Finset import Mathlib.Data.Finset.Sort import Mathlib.Data.Set.Subsingleton #align_import combinatorics.composition from "leanprover-community/mathlib"@"92ca63f0fb391a9ca5f22d2409a6080e786d99f7" open List variable {n : ℕ} ...
Mathlib/Combinatorics/Enumerative/Composition.lean
544
545
theorem eq_ones_iff_le_length {c : Composition n} : c = ones n ↔ n ≤ c.length := by
simp [eq_ones_iff_length, le_antisymm_iff, c.length_le]
import Mathlib.Algebra.Polynomial.AlgebraMap import Mathlib.Algebra.Polynomial.Basic import Mathlib.RingTheory.Ideal.Maps import Mathlib.RingTheory.MvPowerSeries.Basic #align_import ring_theory.power_series.basic from "leanprover-community/mathlib"@"2d5739b61641ee4e7e53eca5688a08f66f2e6a60" noncomputable section ...
Mathlib/RingTheory/PowerSeries/Basic.lean
376
379
theorem coeff_succ_X_mul (n : ℕ) (φ : R⟦X⟧) : coeff R (n + 1) (X * φ) = coeff R n φ := by
simp only [coeff, Finsupp.single_add, add_comm n 1] convert φ.coeff_add_monomial_mul (single () 1) (single () n) _ rw [one_mul]; rfl
import Mathlib.MeasureTheory.Measure.MeasureSpace import Mathlib.MeasureTheory.Measure.Regular import Mathlib.Topology.Sets.Compacts #align_import measure_theory.measure.content from "leanprover-community/mathlib"@"d39590fc8728fbf6743249802486f8c91ffe07bc" universe u v w noncomputable section open Set Topologic...
Mathlib/MeasureTheory/Measure/Content.lean
219
223
theorem is_mul_left_invariant_innerContent [Group G] [TopologicalGroup G] (h : ∀ (g : G) {K : Compacts G}, μ (K.map _ <| continuous_mul_left g) = μ K) (g : G) (U : Opens G) : μ.innerContent (Opens.comap (Homeomorph.mulLeft g).toContinuousMap U) = μ.innerContent U := by
convert μ.innerContent_comap (Homeomorph.mulLeft g) (fun K => h g) U
import Mathlib.SetTheory.Ordinal.Arithmetic import Mathlib.SetTheory.Ordinal.Exponential #align_import set_theory.ordinal.fixed_point from "leanprover-community/mathlib"@"0dd4319a17376eda5763cd0a7e0d35bbaaa50e83" noncomputable section universe u v open Function Order namespace Ordinal section variable {ι ...
Mathlib/SetTheory/Ordinal/FixedPoint.lean
435
437
theorem iterate_le_nfp (f a n) : f^[n] a ≤ nfp f a := by
rw [← sup_iterate_eq_nfp] exact le_sup _ n
import Mathlib.Combinatorics.Quiver.Cast import Mathlib.Combinatorics.Quiver.Symmetric import Mathlib.Data.Sigma.Basic import Mathlib.Logic.Equiv.Basic import Mathlib.Tactic.Common #align_import combinatorics.quiver.covering from "leanprover-community/mathlib"@"188a411e916e1119e502dbe35b8b475716362401" open Funct...
Mathlib/Combinatorics/Quiver/Covering.lean
307
309
theorem Prefunctor.costar_conj_star (u : U) : φ.costar u = Quiver.starEquivCostar (φ.obj u) ∘ φ.star u ∘ (Quiver.starEquivCostar u).symm := by
ext ⟨v, f⟩ <;> simp
import Mathlib.Order.Antichain import Mathlib.Order.UpperLower.Basic import Mathlib.Order.Interval.Set.Basic import Mathlib.Order.RelIso.Set #align_import order.minimal from "leanprover-community/mathlib"@"59694bd07f0a39c5beccba34bd9f413a160782bf" open Function Set variable {α : Type*} (r r₁ r₂ : α → α → Prop) (s...
Mathlib/Order/Minimal.lean
113
115
theorem mem_minimals_iff_forall_lt_not_mem' (rlt : α → α → Prop) [IsNonstrictStrictOrder α r rlt] : x ∈ minimals r s ↔ x ∈ s ∧ ∀ ⦃y⦄, rlt y x → y ∉ s := by
simp [minimals, right_iff_left_not_left_of r rlt, not_imp_not, imp.swap (a := _ ∈ _)]
import Mathlib.Algebra.BigOperators.Pi import Mathlib.Algebra.BigOperators.Ring import Mathlib.Algebra.Order.BigOperators.Ring.Finset import Mathlib.Algebra.BigOperators.Fin import Mathlib.Algebra.Group.Submonoid.Membership import Mathlib.Data.Finsupp.Fin import Mathlib.Data.Finsupp.Indicator #align_import algebra.bi...
Mathlib/Algebra/BigOperators/Finsupp.lean
124
127
theorem sum_ite_self_eq_aux [DecidableEq α] {N : Type*} [AddCommMonoid N] (f : α →₀ N) (a : α) : (if a ∈ f.support then f a else 0) = f a := by
simp only [mem_support_iff, ne_eq, ite_eq_left_iff, not_not] exact fun h ↦ h.symm
import Mathlib.Analysis.Complex.UpperHalfPlane.Basic import Mathlib.LinearAlgebra.GeneralLinearGroup import Mathlib.LinearAlgebra.Matrix.GeneralLinearGroup import Mathlib.Topology.Instances.Matrix import Mathlib.Topology.Algebra.Module.FiniteDimension #align_import number_theory.modular from "leanprover-community/mat...
Mathlib/NumberTheory/Modular.lean
85
89
theorem bottom_row_coprime {R : Type*} [CommRing R] (g : SL(2, R)) : IsCoprime ((↑g : Matrix (Fin 2) (Fin 2) R) 1 0) ((↑g : Matrix (Fin 2) (Fin 2) R) 1 1) := by
use -(↑g : Matrix (Fin 2) (Fin 2) R) 0 1, (↑g : Matrix (Fin 2) (Fin 2) R) 0 0 rw [add_comm, neg_mul, ← sub_eq_add_neg, ← det_fin_two] exact g.det_coe
import Mathlib.Init.Core import Mathlib.LinearAlgebra.AffineSpace.Basis import Mathlib.LinearAlgebra.FiniteDimensional #align_import linear_algebra.affine_space.finite_dimensional from "leanprover-community/mathlib"@"67e606eaea14c7854bdc556bd53d98aefdf76ec0" noncomputable section open Affine section AffineSpace...
Mathlib/LinearAlgebra/AffineSpace/FiniteDimensional.lean
675
678
theorem Coplanar.finiteDimensional_vectorSpan {s : Set P} (h : Coplanar k s) : FiniteDimensional k (vectorSpan k s) := by
refine IsNoetherian.iff_fg.1 (IsNoetherian.iff_rank_lt_aleph0.2 (lt_of_le_of_lt h ?_)) exact Cardinal.lt_aleph0.2 ⟨2, rfl⟩
import Mathlib.Analysis.NormedSpace.Basic import Mathlib.Analysis.Normed.Group.Hom import Mathlib.Data.Real.Sqrt import Mathlib.RingTheory.Ideal.QuotientOperations import Mathlib.Topology.MetricSpace.HausdorffDistance #align_import analysis.normed.group.quotient from "leanprover-community/mathlib"@"2196ab363eb097c008...
Mathlib/Analysis/Normed/Group/Quotient.lean
147
148
theorem quotient_norm_sub_rev {S : AddSubgroup M} (x y : M ⧸ S) : ‖x - y‖ = ‖y - x‖ := by
rw [← neg_sub, quotient_norm_neg]
import Mathlib.Algebra.Group.Defs import Mathlib.Data.Int.Defs import Mathlib.Data.Rat.Init import Mathlib.Order.Basic import Mathlib.Tactic.Common #align_import data.rat.defs from "leanprover-community/mathlib"@"18a5306c091183ac90884daa9373fa3b178e8607" -- TODO: If `Inv` was defined earlier than `Algebra.Group.De...
Mathlib/Data/Rat/Defs.lean
537
540
theorem coe_int_num_of_den_eq_one {q : ℚ} (hq : q.den = 1) : (q.num : ℚ) = q := by
conv_rhs => rw [← num_divInt_den q, hq] rw [intCast_eq_divInt] rfl
import Mathlib.Algebra.CharP.Defs import Mathlib.RingTheory.Multiplicity import Mathlib.RingTheory.PowerSeries.Basic #align_import ring_theory.power_series.basic from "leanprover-community/mathlib"@"2d5739b61641ee4e7e53eca5688a08f66f2e6a60" noncomputable section open Polynomial open Finset (antidiagonal mem_anti...
Mathlib/RingTheory/PowerSeries/Order.lean
99
101
theorem coeff_of_lt_order (n : ℕ) (h : ↑n < order φ) : coeff R n φ = 0 := by
contrapose! h exact order_le _ h
import Mathlib.MeasureTheory.Constructions.Prod.Basic import Mathlib.MeasureTheory.Group.Measure #align_import measure_theory.group.prod from "leanprover-community/mathlib"@"fd5edc43dc4f10b85abfe544b88f82cf13c5f844" noncomputable section open Set hiding prod_eq open Function MeasureTheory open Filter hiding ma...
Mathlib/MeasureTheory/Group/Prod.lean
108
116
theorem measurable_measure_mul_right (hs : MeasurableSet s) : Measurable fun x => μ ((fun y => y * x) ⁻¹' s) := by
suffices Measurable fun y => μ ((fun x => (x, y)) ⁻¹' ((fun z : G × G => ((1 : G), z.1 * z.2)) ⁻¹' univ ×ˢ s)) by convert this using 1; ext1 x; congr 1 with y : 1; simp apply measurable_measure_prod_mk_right apply measurable_const.prod_mk measurable_mul (MeasurableSet.univ.prod hs) infer_instance...
import Mathlib.LinearAlgebra.CliffordAlgebra.Basic import Mathlib.LinearAlgebra.Alternating.Basic #align_import linear_algebra.exterior_algebra.basic from "leanprover-community/mathlib"@"b8d2eaa69d69ce8f03179a5cda774fc0cde984e4" universe u1 u2 u3 u4 u5 variable (R : Type u1) [CommRing R] variable (M : Type u2) [...
Mathlib/LinearAlgebra/ExteriorAlgebra/Basic.lean
274
286
theorem ι_mul_prod_list {n : ℕ} (f : Fin n → M) (i : Fin n) : (ι R <| f i) * (List.ofFn fun i => ι R <| f i).prod = 0 := by
induction' n with n hn · exact i.elim0 · rw [List.ofFn_succ, List.prod_cons, ← mul_assoc] by_cases h : i = 0 · rw [h, ι_sq_zero, zero_mul] · replace hn := congr_arg (ι R (f 0) * ·) <| hn (fun i => f <| Fin.succ i) (i.pred h) simp only at hn rw [Fin.succ_pred, ← mul_assoc, mul_zero...
import Mathlib.Data.Finsupp.ToDFinsupp import Mathlib.LinearAlgebra.Finsupp import Mathlib.LinearAlgebra.LinearIndependent #align_import linear_algebra.dfinsupp from "leanprover-community/mathlib"@"a148d797a1094ab554ad4183a4ad6f130358ef64" variable {ι : Type*} {R : Type*} {S : Type*} {M : ι → Type*} {N : Type*} n...
Mathlib/LinearAlgebra/DFinsupp.lean
206
209
theorem mapRange.linearMap_id : (mapRange.linearMap fun i => (LinearMap.id : β₂ i →ₗ[R] _)) = LinearMap.id := by
ext simp [linearMap]
import Mathlib.Topology.Sets.Closeds #align_import topology.noetherian_space from "leanprover-community/mathlib"@"dc6c365e751e34d100e80fe6e314c3c3e0fd2988" variable (α β : Type*) [TopologicalSpace α] [TopologicalSpace β] namespace TopologicalSpace @[mk_iff] class NoetherianSpace : Prop where wellFounded_open...
Mathlib/Topology/NoetherianSpace.lean
53
56
theorem noetherianSpace_iff_opens : NoetherianSpace α ↔ ∀ s : Opens α, IsCompact (s : Set α) := by
rw [noetherianSpace_iff, CompleteLattice.wellFounded_iff_isSupFiniteCompact, CompleteLattice.isSupFiniteCompact_iff_all_elements_compact] exact forall_congr' Opens.isCompactElement_iff
import Mathlib.GroupTheory.QuotientGroup import Mathlib.GroupTheory.Solvable import Mathlib.GroupTheory.PGroup import Mathlib.GroupTheory.Sylow import Mathlib.Data.Nat.Factorization.Basic import Mathlib.Tactic.TFAE #align_import group_theory.nilpotent from "leanprover-community/mathlib"@"2bbc7e3884ba234309d2a43b19144...
Mathlib/GroupTheory/Nilpotent.lean
384
392
theorem least_ascending_central_series_length_eq_nilpotencyClass : Nat.find ((nilpotent_iff_finite_ascending_central_series G).mp hG) = Group.nilpotencyClass G := by
refine le_antisymm (Nat.find_mono ?_) (Nat.find_mono ?_) · intro n hn exact ⟨upperCentralSeries G, upperCentralSeries_isAscendingCentralSeries G, hn⟩ · rintro n ⟨H, ⟨hH, hn⟩⟩ rw [← top_le_iff, ← hn] exact ascending_central_series_le_upper H hH n
import Mathlib.CategoryTheory.Subobject.Lattice #align_import category_theory.subobject.limits from "leanprover-community/mathlib"@"956af7c76589f444f2e1313911bad16366ea476d" universe v u noncomputable section open CategoryTheory CategoryTheory.Category CategoryTheory.Limits CategoryTheory.Subobject Opposite var...
Mathlib/CategoryTheory/Subobject/Limits.lean
98
100
theorem kernelSubobject_arrow : (kernelSubobjectIso f).hom ≫ kernel.ι f = (kernelSubobject f).arrow := by
simp [kernelSubobjectIso]
import Mathlib.Analysis.SpecialFunctions.Trigonometric.Angle import Mathlib.Analysis.SpecialFunctions.Trigonometric.Inverse #align_import analysis.special_functions.complex.arg from "leanprover-community/mathlib"@"2c1d8ca2812b64f88992a5294ea3dba144755cd1" open Filter Metric Set open scoped ComplexConjugate Real To...
Mathlib/Analysis/SpecialFunctions/Complex/Arg.lean
439
440
theorem arg_inv_coe_angle (x : ℂ) : (arg x⁻¹ : Real.Angle) = -arg x := by
by_cases h : arg x = π <;> simp [arg_inv, h]
import Mathlib.Data.Set.Pairwise.Basic import Mathlib.Data.Set.Lattice import Mathlib.Data.SetLike.Basic #align_import order.chain from "leanprover-community/mathlib"@"c227d107bbada5d0d9d20287e3282c0a7f1651a0" open scoped Classical open Set variable {α β : Type*} section Chain variable (r : α → α → Prop) ...
Mathlib/Order/Chain.lean
107
110
theorem Monotone.isChain_range [LinearOrder α] [Preorder β] {f : α → β} (hf : Monotone f) : IsChain (· ≤ ·) (range f) := by
rw [← image_univ] exact (isChain_of_trichotomous _).image (· ≤ ·) _ _ hf
import Mathlib.LinearAlgebra.Contraction import Mathlib.LinearAlgebra.Matrix.Charpoly.Coeff #align_import linear_algebra.trace from "leanprover-community/mathlib"@"4cf7ca0e69e048b006674cf4499e5c7d296a89e0" noncomputable section universe u v w namespace LinearMap open Matrix open FiniteDimensional open Tensor...
Mathlib/LinearAlgebra/Trace.lean
186
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theorem trace_one : trace R M 1 = (finrank R M : R) := by
cases subsingleton_or_nontrivial R · simp [eq_iff_true_of_subsingleton] have b := Module.Free.chooseBasis R M rw [trace_eq_matrix_trace R b, toMatrix_one, finrank_eq_card_chooseBasisIndex] simp
import Mathlib.Analysis.Calculus.Deriv.Pow import Mathlib.Analysis.Calculus.Deriv.Inv #align_import analysis.calculus.deriv.zpow from "leanprover-community/mathlib"@"3bce8d800a6f2b8f63fe1e588fd76a9ff4adcebe" universe u v w open scoped Classical open Topology Filter open Filter Asymptotics Set variable {𝕜 : Typ...
Mathlib/Analysis/Calculus/Deriv/ZPow.lean
138
140
theorem iter_deriv_inv (k : ℕ) (x : 𝕜) : deriv^[k] Inv.inv x = (∏ i ∈ Finset.range k, (-1 - i : 𝕜)) * x ^ (-1 - k : ℤ) := by
simpa only [zpow_neg_one, Int.cast_neg, Int.cast_one] using iter_deriv_zpow (-1) x k
import Mathlib.Order.Filter.Cofinite #align_import topology.bornology.basic from "leanprover-community/mathlib"@"8631e2d5ea77f6c13054d9151d82b83069680cb1" open Set Filter variable {ι α β : Type*} class Bornology (α : Type*) where cobounded' : Filter α le_cofinite' : cobounded' ≤ cofinite #align borno...
Mathlib/Topology/Bornology/Basic.lean
294
295
theorem isBounded_sUnion {S : Set (Set α)} (hs : S.Finite) : IsBounded (⋃₀ S) ↔ ∀ s ∈ S, IsBounded s := by
rw [sUnion_eq_biUnion, isBounded_biUnion hs]
import Mathlib.AlgebraicTopology.DoldKan.Normalized #align_import algebraic_topology.dold_kan.homotopy_equivalence from "leanprover-community/mathlib"@"f951e201d416fb50cc7826171d80aa510ec20747" open CategoryTheory CategoryTheory.Category CategoryTheory.Limits CategoryTheory.Preadditive Simplicial DoldKan nonco...
Mathlib/AlgebraicTopology/DoldKan/HomotopyEquivalence.lean
52
58
theorem homotopyPToId_eventually_constant {q n : ℕ} (hqn : n < q) : ((homotopyPToId X (q + 1)).hom n (n + 1) : X _[n] ⟶ X _[n + 1]) = (homotopyPToId X q).hom n (n + 1) := by
simp only [homotopyHσToZero, AlternatingFaceMapComplex.obj_X, Nat.add_eq, Homotopy.trans_hom, Homotopy.ofEq_hom, Pi.zero_apply, Homotopy.add_hom, Homotopy.compLeft_hom, add_zero, Homotopy.nullHomotopy'_hom, ComplexShape.down_Rel, hσ'_eq_zero hqn (c_mk (n + 1) n rfl), dite_eq_ite, ite_self, comp_zero, zer...
import Mathlib.Analysis.Complex.AbsMax import Mathlib.Analysis.Asymptotics.SuperpolynomialDecay #align_import analysis.complex.phragmen_lindelof from "leanprover-community/mathlib"@"f2ce6086713c78a7f880485f7917ea547a215982" open Set Function Filter Asymptotics Metric Complex Bornology open scoped Topology Filter R...
Mathlib/Analysis/Complex/PhragmenLindelof.lean
529
550
theorem quadrant_III (hd : DiffContOnCl ℂ f (Iio 0 ×ℂ Iio 0)) (hB : ∃ c < (2 : ℝ), ∃ B, f =O[cobounded ℂ ⊓ 𝓟 (Iio 0 ×ℂ Iio 0)] fun z => expR (B * abs z ^ c)) (hre : ∀ x : ℝ, x ≤ 0 → ‖f x‖ ≤ C) (him : ∀ x : ℝ, x ≤ 0 → ‖f (x * I)‖ ≤ C) (hz_re : z.re ≤ 0) (hz_im : z.im ≤ 0) : ‖f z‖ ≤ C := by
obtain ⟨z, rfl⟩ : ∃ z', -z' = z := ⟨-z, neg_neg z⟩ simp only [neg_re, neg_im, neg_nonpos] at hz_re hz_im change ‖(f ∘ Neg.neg) z‖ ≤ C have H : MapsTo Neg.neg (Ioi 0 ×ℂ Ioi 0) (Iio 0 ×ℂ Iio 0) := by intro w hw simpa only [mem_reProdIm, neg_re, neg_im, neg_lt_zero, mem_Iio] using hw refine quadrant...
import Mathlib.Logic.Relation import Mathlib.Data.List.Forall2 import Mathlib.Data.List.Lex import Mathlib.Data.List.Infix #align_import data.list.chain from "leanprover-community/mathlib"@"dd71334db81d0bd444af1ee339a29298bef40734" -- Make sure we haven't imported `Data.Nat.Order.Basic` assert_not_exists OrderedSu...
Mathlib/Data/List/Chain.lean
223
225
theorem chain'_append_cons_cons {b c : α} {l₁ l₂ : List α} : Chain' R (l₁ ++ b :: c :: l₂) ↔ Chain' R (l₁ ++ [b]) ∧ R b c ∧ Chain' R (c :: l₂) := by
rw [chain'_split, chain'_cons]
import Mathlib.Algebra.Order.BigOperators.Ring.Finset import Mathlib.Analysis.Convex.Hull import Mathlib.LinearAlgebra.AffineSpace.Basis #align_import analysis.convex.combination from "leanprover-community/mathlib"@"92bd7b1ffeb306a89f450bee126ddd8a284c259d" open Set Function open scoped Classical open Pointwise ...
Mathlib/Analysis/Convex/Combination.lean
191
194
theorem Convex.sum_mem (hs : Convex R s) (h₀ : ∀ i ∈ t, 0 ≤ w i) (h₁ : ∑ i ∈ t, w i = 1) (hz : ∀ i ∈ t, z i ∈ s) : (∑ i ∈ t, w i • z i) ∈ s := by
simpa only [h₁, centerMass, inv_one, one_smul] using hs.centerMass_mem h₀ (h₁.symm ▸ zero_lt_one) hz
import Mathlib.Algebra.DirectSum.Module import Mathlib.Algebra.Module.Submodule.Basic #align_import algebra.direct_sum.decomposition from "leanprover-community/mathlib"@"4e861f25ba5ceef42ba0712d8ffeb32f38ad6441" variable {ι R M σ : Type*} open DirectSum namespace DirectSum section AddCommMonoid variable [Deci...
Mathlib/Algebra/DirectSum/Decomposition.lean
145
147
theorem degree_eq_of_mem_mem {x : M} {i j : ι} (hxi : x ∈ ℳ i) (hxj : x ∈ ℳ j) (hx : x ≠ 0) : i = j := by
contrapose! hx; rw [← decompose_of_mem_same ℳ hxj, decompose_of_mem_ne ℳ hxi hx]
import Mathlib.Topology.Sheaves.PUnit import Mathlib.Topology.Sheaves.Stalks import Mathlib.Topology.Sheaves.Functors #align_import topology.sheaves.skyscraper from "leanprover-community/mathlib"@"70fd9563a21e7b963887c9360bd29b2393e6225a" noncomputable section open TopologicalSpace TopCat CategoryTheory CategoryT...
Mathlib/Topology/Sheaves/Skyscraper.lean
68
74
theorem skyscraperPresheaf_eq_pushforward [hd : ∀ U : Opens (TopCat.of PUnit.{u + 1}), Decidable (PUnit.unit ∈ U)] : skyscraperPresheaf p₀ A = ContinuousMap.const (TopCat.of PUnit) p₀ _* skyscraperPresheaf (X := TopCat.of PUnit) PUnit.unit A := by
convert_to @skyscraperPresheaf X p₀ (fun U => hd <| (Opens.map <| ContinuousMap.const _ p₀).obj U) C _ _ A = _ <;> congr
import Mathlib.Analysis.Calculus.FormalMultilinearSeries import Mathlib.Analysis.SpecificLimits.Normed import Mathlib.Logic.Equiv.Fin import Mathlib.Topology.Algebra.InfiniteSum.Module #align_import analysis.analytic.basic from "leanprover-community/mathlib"@"32253a1a1071173b33dc7d6a218cf722c6feb514" noncomputable...
Mathlib/Analysis/Analytic/Basic.lean
284
289
theorem summable_norm_apply (p : FormalMultilinearSeries 𝕜 E F) {x : E} (hx : x ∈ EMetric.ball (0 : E) p.radius) : Summable fun n : ℕ => ‖p n fun _ => x‖ := by
rw [mem_emetric_ball_zero_iff] at hx refine .of_nonneg_of_le (fun _ ↦ norm_nonneg _) (fun n ↦ ((p n).le_opNorm _).trans_eq ?_) (p.summable_norm_mul_pow hx) simp
import Mathlib.Algebra.Order.Field.Power import Mathlib.NumberTheory.Padics.PadicVal #align_import number_theory.padics.padic_norm from "leanprover-community/mathlib"@"92ca63f0fb391a9ca5f22d2409a6080e786d99f7" def padicNorm (p : ℕ) (q : ℚ) : ℚ := if q = 0 then 0 else (p : ℚ) ^ (-padicValRat p q) #align padic_n...
Mathlib/NumberTheory/Padics/PadicNorm.lean
348
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theorem sum_le' {α : Type*} {F : α → ℚ} {t : ℚ} {s : Finset α} (hF : ∀ i ∈ s, padicNorm p (F i) ≤ t) (ht : 0 ≤ t) : padicNorm p (∑ i ∈ s, F i) ≤ t := by
obtain rfl | hs := Finset.eq_empty_or_nonempty s · simp [ht] · exact sum_le hs hF
import Mathlib.MeasureTheory.Group.Measure assert_not_exists NormedSpace namespace MeasureTheory open Measure TopologicalSpace open scoped ENNReal variable {G : Type*} [MeasurableSpace G] {μ : Measure G} {g : G} section MeasurableMul variable [Group G] [MeasurableMul G] @[to_additive "Translating a fu...
Mathlib/MeasureTheory/Group/LIntegral.lean
46
49
theorem lintegral_mul_right_eq_self [IsMulRightInvariant μ] (f : G → ℝ≥0∞) (g : G) : (∫⁻ x, f (x * g) ∂μ) = ∫⁻ x, f x ∂μ := by
convert (lintegral_map_equiv f <| MeasurableEquiv.mulRight g).symm using 1 simp [map_mul_right_eq_self μ g]
import Mathlib.Topology.Instances.ENNReal import Mathlib.MeasureTheory.Measure.Dirac #align_import probability.probability_mass_function.basic from "leanprover-community/mathlib"@"4ac69b290818724c159de091daa3acd31da0ee6d" noncomputable section variable {α β γ : Type*} open scoped Classical open NNReal ENNReal M...
Mathlib/Probability/ProbabilityMassFunction/Basic.lean
136
138
theorem coe_le_one (p : PMF α) (a : α) : p a ≤ 1 := by
refine hasSum_le (fun b => ?_) (hasSum_ite_eq a (p a)) (hasSum_coe_one p) split_ifs with h <;> simp only [h, zero_le', le_rfl]
import Mathlib.Data.List.Nodup #align_import data.list.duplicate from "leanprover-community/mathlib"@"f694c7dead66f5d4c80f446c796a5aad14707f0e" variable {α : Type*} namespace List inductive Duplicate (x : α) : List α → Prop | cons_mem {l : List α} : x ∈ l → Duplicate x (x :: l) | cons_duplicate {y : α} {l ...
Mathlib/Data/List/Duplicate.lean
98
99
theorem Duplicate.of_duplicate_cons {y : α} (h : x ∈+ y :: l) (hx : x ≠ y) : x ∈+ l := by
simpa [duplicate_cons_iff, hx.symm] using h
import Mathlib.Algebra.Group.Subgroup.Pointwise import Mathlib.Data.Set.Basic import Mathlib.Data.Setoid.Basic import Mathlib.GroupTheory.Coset #align_import group_theory.double_coset from "leanprover-community/mathlib"@"4c19a16e4b705bf135cf9a80ac18fcc99c438514" -- Porting note: removed import -- import Mathlib.Tac...
Mathlib/GroupTheory/DoubleCoset.lean
199
205
theorem left_bot_eq_left_quot (H : Subgroup G) : Quotient (⊥ : Subgroup G).1 (H : Set G) = (G ⧸ H) := by
unfold Quotient congr ext simp_rw [← bot_rel_eq_leftRel H] rfl
import Mathlib.Analysis.Convex.Combination import Mathlib.Analysis.Convex.Strict import Mathlib.Topology.Connected.PathConnected import Mathlib.Topology.Algebra.Affine import Mathlib.Topology.Algebra.Module.Basic #align_import analysis.convex.topology from "leanprover-community/mathlib"@"0e3aacdc98d25e0afe035c452d876...
Mathlib/Analysis/Convex/Topology.lean
228
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theorem Convex.add_smul_mem_interior' {s : Set E} (hs : Convex 𝕜 s) {x y : E} (hx : x ∈ closure s) (hy : x + y ∈ interior s) {t : 𝕜} (ht : t ∈ Ioc (0 : 𝕜) 1) : x + t • y ∈ interior s := by
simpa only [add_sub_cancel_left] using hs.add_smul_sub_mem_interior' hx hy ht
import Mathlib.Data.Set.Pointwise.Interval import Mathlib.Topology.Algebra.Field import Mathlib.Topology.Algebra.Order.Group #align_import topology.algebra.order.field from "leanprover-community/mathlib"@"9a59dcb7a2d06bf55da57b9030169219980660cd" open Set Filter TopologicalSpace Function open scoped Pointwise Top...
Mathlib/Topology/Algebra/Order/Field.lean
94
97
theorem Filter.Tendsto.atBot_mul {C : 𝕜} (hC : 0 < C) (hf : Tendsto f l atBot) (hg : Tendsto g l (𝓝 C)) : Tendsto (fun x => f x * g x) l atBot := by
have := (tendsto_neg_atBot_atTop.comp hf).atTop_mul hC hg simpa [(· ∘ ·)] using tendsto_neg_atTop_atBot.comp this
import Mathlib.Data.Nat.Factorial.Basic import Mathlib.Order.Monotone.Basic #align_import data.nat.choose.basic from "leanprover-community/mathlib"@"2f3994e1b117b1e1da49bcfb67334f33460c3ce4" open Nat namespace Nat def choose : ℕ → ℕ → ℕ | _, 0 => 1 | 0, _ + 1 => 0 | n + 1, k + 1 => choose n k + choose n ...
Mathlib/Data/Nat/Choose/Basic.lean
257
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theorem choose_eq_asc_factorial_div_factorial (n k : ℕ) : (n + k).choose k = (n + 1).ascFactorial k / k ! := by
apply Nat.mul_left_cancel k.factorial_pos rw [← ascFactorial_eq_factorial_mul_choose] exact (Nat.mul_div_cancel' <| factorial_dvd_ascFactorial _ _).symm
import Mathlib.Algebra.BigOperators.Group.Finset import Mathlib.Algebra.Order.Module.OrderedSMul import Mathlib.Algebra.Order.Group.Instances import Mathlib.Data.Prod.Lex import Mathlib.Data.Set.Image import Mathlib.GroupTheory.Perm.Support import Mathlib.Order.Monotone.Monovary import Mathlib.Tactic.Abel #align_impo...
Mathlib/Algebra/Order/Rearrangement.lean
308
310
theorem Antivary.sum_smul_lt_sum_smul_comp_perm_iff (hfg : Antivary f g) : ((∑ i, f i • g i) < ∑ i, f i • g (σ i)) ↔ ¬Antivary f (g ∘ σ) := by
simp [(hfg.antivaryOn _).sum_smul_lt_sum_smul_comp_perm_iff fun _ _ ↦ mem_univ _]
import Mathlib.Data.Finset.Image import Mathlib.Data.List.FinRange #align_import data.fintype.basic from "leanprover-community/mathlib"@"d78597269638367c3863d40d45108f52207e03cf" assert_not_exists MonoidWithZero assert_not_exists MulAction open Function open Nat universe u v variable {α β γ : Type*} class Fi...
Mathlib/Data/Fintype/Basic.lean
268
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theorem insert_inj_on' (s : Finset α) : Set.InjOn (fun a => insert a s) (sᶜ : Finset α) := by
rw [coe_compl] exact s.insert_inj_on
import Mathlib.CategoryTheory.Sites.Sheaf #align_import category_theory.sites.plus from "leanprover-community/mathlib"@"70fd9563a21e7b963887c9360bd29b2393e6225a" namespace CategoryTheory.GrothendieckTopology open CategoryTheory open CategoryTheory.Limits open Opposite universe w v u variable {C : Type u} [Ca...
Mathlib/CategoryTheory/Sites/Plus.lean
323
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theorem plus_hom_ext {P Q : Cᵒᵖ ⥤ D} (η γ : J.plusObj P ⟶ Q) (hQ : Presheaf.IsSheaf J Q) (h : J.toPlus P ≫ η = J.toPlus P ≫ γ) : η = γ := by
have : γ = J.plusLift (J.toPlus P ≫ γ) hQ := by apply plusLift_unique rfl rw [this] apply plusLift_unique exact h
import Mathlib.Algebra.Order.BigOperators.Ring.Finset import Mathlib.Data.Nat.Totient import Mathlib.GroupTheory.OrderOfElement import Mathlib.GroupTheory.Subgroup.Simple import Mathlib.Tactic.Group import Mathlib.GroupTheory.Exponent #align_import group_theory.specific_groups.cyclic from "leanprover-community/mathli...
Mathlib/GroupTheory/SpecificGroups/Cyclic.lean
178
185
theorem isCyclic_of_surjective {H G F : Type*} [Group H] [Group G] [hH : IsCyclic H] [FunLike F H G] [MonoidHomClass F H G] (f : F) (hf : Function.Surjective f) : IsCyclic G := by
obtain ⟨x, hx⟩ := hH refine ⟨f x, fun a ↦ ?_⟩ obtain ⟨a, rfl⟩ := hf a obtain ⟨n, rfl⟩ := hx a exact ⟨n, (map_zpow _ _ _).symm⟩
import Mathlib.Data.PFunctor.Multivariate.Basic import Mathlib.Data.PFunctor.Univariate.M #align_import data.pfunctor.multivariate.M from "leanprover-community/mathlib"@"2738d2ca56cbc63be80c3bd48e9ed90ad94e947d" set_option linter.uppercaseLean3 false universe u open MvFunctor namespace MvPFunctor open TypeVec...
Mathlib/Data/PFunctor/Multivariate/M.lean
318
325
theorem M.dest_map {α β : TypeVec n} (g : α ⟹ β) (x : P.M α) : M.dest P (g <$$> x) = (appendFun g fun x => g <$$> x) <$$> M.dest P x := by
cases' x with a f rw [map_eq] conv => rhs rw [M.dest, M.dest', map_eq, appendFun_comp_splitFun] rfl
import Mathlib.Algebra.BigOperators.Ring.List import Mathlib.Data.Nat.ModEq import Mathlib.Data.Nat.GCD.BigOperators namespace Nat variable {ι : Type*} lemma modEq_list_prod_iff {a b} {l : List ℕ} (co : l.Pairwise Coprime) : a ≡ b [MOD l.prod] ↔ ∀ i, a ≡ b [MOD l.get i] := by induction' l with m l ih · si...
Mathlib/Data/Nat/ChineseRemainder.lean
93
105
theorem chineseRemainderOfList_modEq_unique (l : List ι) (co : l.Pairwise (Coprime on s)) {z} (hz : ∀ i ∈ l, z ≡ a i [MOD s i]) : z ≡ chineseRemainderOfList a s l co [MOD (l.map s).prod] := by
induction' l with i l ih · simp [modEq_one] · simp only [List.map_cons, List.prod_cons, chineseRemainderOfList] have : Coprime (s i) (l.map s).prod := by simp only [coprime_list_prod_right_iff, List.mem_map, forall_exists_index, and_imp, forall_apply_eq_imp_iff₂] intro j hj exact (L...
import Mathlib.GroupTheory.GroupAction.ConjAct import Mathlib.GroupTheory.GroupAction.Quotient import Mathlib.GroupTheory.QuotientGroup import Mathlib.Topology.Algebra.Monoid import Mathlib.Topology.Algebra.Constructions #align_import topology.algebra.group.basic from "leanprover-community/mathlib"@"3b1890e71632be9e3...
Mathlib/Topology/Algebra/Group/Basic.lean
605
606
theorem tendsto_inv_nhdsWithin_Iio_inv {a : H} : Tendsto Inv.inv (𝓝[<] a⁻¹) (𝓝[>] a) := by
simpa only [inv_inv] using @tendsto_inv_nhdsWithin_Iio _ _ _ _ a⁻¹
import Mathlib.Algebra.MonoidAlgebra.Degree import Mathlib.Algebra.Polynomial.Coeff import Mathlib.Algebra.Polynomial.Monomial import Mathlib.Data.Fintype.BigOperators import Mathlib.Data.Nat.WithBot import Mathlib.Data.Nat.Cast.WithTop import Mathlib.Data.Nat.SuccPred #align_import data.polynomial.degree.definitions...
Mathlib/Algebra/Polynomial/Degree/Definitions.lean
418
425
theorem sum_fin [AddCommMonoid S] (f : ℕ → R → S) (hf : ∀ i, f i 0 = 0) {n : ℕ} {p : R[X]} (hn : p.degree < n) : (∑ i : Fin n, f i (p.coeff i)) = p.sum f := by
by_cases hp : p = 0 · rw [hp, sum_zero_index, Finset.sum_eq_zero] intro i _ exact hf i rw [sum_over_range' _ hf n ((natDegree_lt_iff_degree_lt hp).mpr hn), Fin.sum_univ_eq_sum_range fun i => f i (p.coeff i)]
import Mathlib.Algebra.Group.Equiv.TypeTags import Mathlib.GroupTheory.FreeAbelianGroup import Mathlib.GroupTheory.FreeGroup.IsFreeGroup import Mathlib.LinearAlgebra.Dimension.StrongRankCondition #align_import group_theory.free_abelian_group_finsupp from "leanprover-community/mathlib"@"47b51515e69f59bca5cf34ef456e600...
Mathlib/GroupTheory/FreeAbelianGroupFinsupp.lean
54
59
theorem FreeAbelianGroup.toFinsupp_comp_toFreeAbelianGroup : toFinsupp.comp toFreeAbelianGroup = AddMonoidHom.id (X →₀ ℤ) := by
ext x y; simp only [AddMonoidHom.id_comp] rw [AddMonoidHom.comp_assoc, Finsupp.toFreeAbelianGroup_comp_singleAddHom] simp only [toFinsupp, AddMonoidHom.coe_comp, Finsupp.singleAddHom_apply, Function.comp_apply, one_smul, lift.of, AddMonoidHom.flip_apply, smulAddHom_apply, AddMonoidHom.id_apply]
import Mathlib.Analysis.NormedSpace.OperatorNorm.Basic suppress_compilation open Bornology open Filter hiding map_smul open scoped Classical NNReal Topology Uniformity -- the `ₗ` subscript variables are for special cases about linear (as opposed to semilinear) maps variable {𝕜 𝕜₂ 𝕜₃ E Eₗ F Fₗ G Gₗ 𝓕 : Type*} ...
Mathlib/Analysis/NormedSpace/OperatorNorm/NNNorm.lean
210
220
theorem sSup_closed_unit_ball_eq_nnnorm {𝕜 𝕜₂ E F : Type*} [NormedAddCommGroup E] [SeminormedAddCommGroup F] [DenselyNormedField 𝕜] [NontriviallyNormedField 𝕜₂] {σ₁₂ : 𝕜 →+* 𝕜₂} [NormedSpace 𝕜 E] [NormedSpace 𝕜₂ F] [RingHomIsometric σ₁₂] (f : E →SL[σ₁₂] F) : sSup ((fun x => ‖f x‖₊) '' closedBall 0 1...
have hbdd : ∀ y ∈ (fun x => ‖f x‖₊) '' closedBall 0 1, y ≤ ‖f‖₊ := by rintro - ⟨x, hx, rfl⟩ exact f.unit_le_opNorm x (mem_closedBall_zero_iff.1 hx) refine le_antisymm (csSup_le ((nonempty_closedBall.mpr zero_le_one).image _) hbdd) ?_ rw [← sSup_unit_ball_eq_nnnorm] exact csSup_le_csSup ⟨‖f‖₊, hbdd⟩ ((n...
import Mathlib.MeasureTheory.Measure.Trim import Mathlib.MeasureTheory.MeasurableSpace.CountablyGenerated #align_import measure_theory.measure.ae_measurable from "leanprover-community/mathlib"@"3310acfa9787aa171db6d4cba3945f6f275fe9f2" open scoped Classical open MeasureTheory MeasureTheory.Measure Filter Set Funct...
Mathlib/MeasureTheory/Measure/AEMeasurable.lean
238
243
theorem aemeasurable_const' (h : ∀ᵐ (x) (y) ∂μ, f x = f y) : AEMeasurable f μ := by
rcases eq_or_ne μ 0 with (rfl | hμ) · exact aemeasurable_zero_measure · haveI := ae_neBot.2 hμ rcases h.exists with ⟨x, hx⟩ exact ⟨const α (f x), measurable_const, EventuallyEq.symm hx⟩
import Mathlib.Algebra.Order.Monoid.Unbundled.MinMax import Mathlib.Algebra.Order.Monoid.WithTop import Mathlib.Data.Finset.Image import Mathlib.Data.Multiset.Fold #align_import data.finset.fold from "leanprover-community/mathlib"@"9003f28797c0664a49e4179487267c494477d853" -- TODO: -- assert_not_exists OrderedComm...
Mathlib/Data/Finset/Fold.lean
50
52
theorem fold_cons (h : a ∉ s) : (cons a s h).fold op b f = f a * s.fold op b f := by
dsimp only [fold] rw [cons_val, Multiset.map_cons, fold_cons_left]
import Mathlib.Order.Partition.Equipartition #align_import combinatorics.simple_graph.regularity.equitabilise from "leanprover-community/mathlib"@"bf7ef0e83e5b7e6c1169e97f055e58a2e4e9d52d" open Finset Nat namespace Finpartition variable {α : Type*} [DecidableEq α] {s t : Finset α} {m n a b : ℕ} {P : Finpartitio...
Mathlib/Combinatorics/SimpleGraph/Regularity/Equitabilise.lean
205
215
theorem exists_equipartition_card_eq (hn : n ≠ 0) (hs : n ≤ s.card) : ∃ P : Finpartition s, P.IsEquipartition ∧ P.parts.card = n := by
rw [← pos_iff_ne_zero] at hn have : (n - s.card % n) * (s.card / n) + s.card % n * (s.card / n + 1) = s.card := by rw [tsub_mul, mul_add, ← add_assoc, tsub_add_cancel_of_le (Nat.mul_le_mul_right _ (mod_lt _ hn).le), mul_one, add_comm, mod_add_div] refine ⟨(indiscrete (card_pos.1 <| hn.trans_l...
import Mathlib.Algebra.GradedMonoid import Mathlib.Algebra.Order.Monoid.Canonical.Defs import Mathlib.Algebra.MvPolynomial.Basic #align_import ring_theory.mv_polynomial.weighted_homogeneous from "leanprover-community/mathlib"@"2f5b500a507264de86d666a5f87ddb976e2d8de4" noncomputable section open Set Function Fins...
Mathlib/RingTheory/MvPolynomial/WeightedHomogeneous.lean
168
173
theorem weightedHomogeneousSubmodule_eq_finsupp_supported (w : σ → M) (m : M) : weightedHomogeneousSubmodule R w m = Finsupp.supported R R { d | weightedDegree w d = m } := by
ext x rw [mem_supported, Set.subset_def] simp only [Finsupp.mem_support_iff, mem_coe] rfl
import Mathlib.Algebra.Polynomial.Degree.CardPowDegree import Mathlib.Analysis.SpecialFunctions.Pow.Real import Mathlib.NumberTheory.ClassNumber.AdmissibleAbsoluteValue import Mathlib.RingTheory.Ideal.LocalRing #align_import number_theory.class_number.admissible_card_pow_degree from "leanprover-community/mathlib"@"0b...
Mathlib/NumberTheory/ClassNumber/AdmissibleCardPowDegree.lean
178
243
theorem exists_partition_polynomial_aux (n : ℕ) {ε : ℝ} (hε : 0 < ε) {b : Fq[X]} (hb : b ≠ 0) (A : Fin n → Fq[X]) : ∃ t : Fin n → Fin (Fintype.card Fq ^ ⌈-log ε / log (Fintype.card Fq)⌉₊), ∀ i₀ i₁ : Fin n, t i₀ = t i₁ ↔ (cardPowDegree (A i₁ % b - A i₀ % b) : ℝ) < cardPowDegree b • ε := by
have hbε : 0 < cardPowDegree b • ε := by rw [Algebra.smul_def, eq_intCast] exact mul_pos (Int.cast_pos.mpr (AbsoluteValue.pos _ hb)) hε -- We go by induction on the size `A`. induction' n with n ih · refine ⟨finZeroElim, finZeroElim⟩ -- Show `anti_archimedean` also holds for real distances. have an...
import Mathlib.NumberTheory.LegendreSymbol.QuadraticReciprocity #align_import number_theory.legendre_symbol.jacobi_symbol from "leanprover-community/mathlib"@"74a27133cf29446a0983779e37c8f829a85368f3" section Jacobi open Nat ZMod -- Since we need the fact that the factors are prime, we use `List.pmap`. def ...
Mathlib/NumberTheory/LegendreSymbol/JacobiSymbol.lean
331
337
theorem value_at (a : ℤ) {R : Type*} [CommSemiring R] (χ : R →* ℤ) (hp : ∀ (p : ℕ) (pp : p.Prime), p ≠ 2 → @legendreSym p ⟨pp⟩ a = χ p) {b : ℕ} (hb : Odd b) : J(a | b) = χ b := by
conv_rhs => rw [← prod_factors hb.pos.ne', cast_list_prod, map_list_prod χ] rw [jacobiSym, List.map_map, ← List.pmap_eq_map Nat.Prime _ _ fun _ => prime_of_mem_factors] congr 1; apply List.pmap_congr exact fun p h pp _ => hp p pp (hb.ne_two_of_dvd_nat <| dvd_of_mem_factors h)
import Mathlib.Data.Nat.Choose.Basic import Mathlib.Data.List.Perm import Mathlib.Data.List.Range #align_import data.list.sublists from "leanprover-community/mathlib"@"ccad6d5093bd2f5c6ca621fc74674cce51355af6" universe u v w variable {α : Type u} {β : Type v} {γ : Type w} open Nat namespace List @[simp] theo...
Mathlib/Data/List/Sublists.lean
385
386
theorem nodup_sublists' {l : List α} : Nodup (sublists' l) ↔ Nodup l := by
rw [sublists'_eq_sublists, nodup_map_iff reverse_injective, nodup_sublists, nodup_reverse]
import Mathlib.LinearAlgebra.Dimension.Free import Mathlib.Algebra.Module.Torsion #align_import linear_algebra.dimension from "leanprover-community/mathlib"@"47a5f8186becdbc826190ced4312f8199f9db6a5" noncomputable section universe u v v' u₁' w w' variable {R S : Type u} {M : Type v} {M' : Type v'} {M₁ : Type v}...
Mathlib/LinearAlgebra/Dimension/Constructions.lean
538
541
theorem subalgebra_top_rank_eq_submodule_top_rank : Module.rank F (⊤ : Subalgebra F E) = Module.rank F (⊤ : Submodule F E) := by
rw [← Algebra.top_toSubmodule] rfl
import Mathlib.Geometry.Euclidean.Circumcenter #align_import geometry.euclidean.monge_point from "leanprover-community/mathlib"@"1a4df69ca1a9a0e5e26bfe12e2b92814216016d0" noncomputable section open scoped Classical open scoped RealInnerProductSpace namespace Affine namespace Simplex open Finset AffineSubspac...
Mathlib/Geometry/Euclidean/MongePoint.lean
297
327
theorem eq_mongePoint_of_forall_mem_mongePlane {n : ℕ} {s : Simplex ℝ P (n + 2)} {i₁ : Fin (n + 3)} {p : P} (h : ∀ i₂, i₁ ≠ i₂ → p ∈ s.mongePlane i₁ i₂) : p = s.mongePoint := by
rw [← @vsub_eq_zero_iff_eq V] have h' : ∀ i₂, i₁ ≠ i₂ → p -ᵥ s.mongePoint ∈ (ℝ ∙ s.points i₁ -ᵥ s.points i₂)ᗮ ⊓ vectorSpan ℝ (Set.range s.points) := by intro i₂ hne rw [← s.direction_mongePlane, vsub_right_mem_direction_iff_mem s.mongePoint_mem_mongePlane] exact h i₂ hne have hi : p -ᵥ s.mongeP...
import Mathlib.Data.Multiset.Bind import Mathlib.Control.Traversable.Lemmas import Mathlib.Control.Traversable.Instances #align_import data.multiset.functor from "leanprover-community/mathlib"@"1f0096e6caa61e9c849ec2adbd227e960e9dff58" universe u namespace Multiset open List instance functor : Functor Multiset...
Mathlib/Data/Multiset/Functor.lean
137
143
theorem naturality {G H : Type _ → Type _} [Applicative G] [Applicative H] [CommApplicative G] [CommApplicative H] (eta : ApplicativeTransformation G H) {α β : Type _} (f : α → G β) (x : Multiset α) : eta (traverse f x) = traverse (@eta _ ∘ f) x := by
refine Quotient.inductionOn x ?_ intro simp only [quot_mk_to_coe, traverse, lift_coe, Function.comp_apply, ApplicativeTransformation.preserves_map, LawfulTraversable.naturality]
import Mathlib.Analysis.NormedSpace.IndicatorFunction import Mathlib.MeasureTheory.Function.EssSup import Mathlib.MeasureTheory.Function.AEEqFun import Mathlib.MeasureTheory.Function.SpecialFunctions.Basic #align_import measure_theory.function.lp_seminorm from "leanprover-community/mathlib"@"c4015acc0a223449d44061e27...
Mathlib/MeasureTheory/Function/LpSeminorm/Basic.lean
117
120
theorem lintegral_rpow_nnnorm_eq_rpow_snorm' {f : α → F} (hq0_lt : 0 < q) : (∫⁻ a, (‖f a‖₊ : ℝ≥0∞) ^ q ∂μ) = snorm' f q μ ^ q := by
rw [snorm', ← ENNReal.rpow_mul, one_div, inv_mul_cancel, ENNReal.rpow_one] exact (ne_of_lt hq0_lt).symm
import Mathlib.Topology.Category.TopCat.Limits.Products #align_import topology.category.Top.limits.pullbacks from "leanprover-community/mathlib"@"178a32653e369dce2da68dc6b2694e385d484ef1" -- Porting note: every ML3 decl has an uppercase letter set_option linter.uppercaseLean3 false open TopologicalSpace open Cat...
Mathlib/Topology/Category/TopCat/Limits/Pullbacks.lean
424
441
theorem pullback_fst_image_snd_preimage (f : X ⟶ Z) (g : Y ⟶ Z) (U : Set Y) : (pullback.fst : pullback f g ⟶ _) '' ((pullback.snd : pullback f g ⟶ _) ⁻¹' U) = f ⁻¹' (g '' U) := by
ext x constructor · rintro ⟨(y : (forget TopCat).obj _), hy, rfl⟩ exact ⟨(pullback.snd : pullback f g ⟶ _) y, hy, (ConcreteCategory.congr_hom pullback.condition y).symm⟩ · rintro ⟨y, hy, eq⟩ -- next 5 lines were -- `exact ⟨(TopCat.pullbackIsoProdSubtype f g).inv ⟨⟨_, _⟩, eq.symm⟩, by ...
import Mathlib.Analysis.BoxIntegral.Box.Basic import Mathlib.Analysis.SpecificLimits.Basic #align_import analysis.box_integral.box.subbox_induction from "leanprover-community/mathlib"@"f2ce6086713c78a7f880485f7917ea547a215982" open Set Finset Function Filter Metric Classical Topology Filter ENNReal noncomputable...
Mathlib/Analysis/BoxIntegral/Box/SubboxInduction.lean
53
62
theorem mem_splitCenterBox {s : Set ι} {y : ι → ℝ} : y ∈ I.splitCenterBox s ↔ y ∈ I ∧ ∀ i, (I.lower i + I.upper i) / 2 < y i ↔ i ∈ s := by
simp only [splitCenterBox, mem_def, ← forall_and] refine forall_congr' fun i ↦ ?_ dsimp only [Set.piecewise] split_ifs with hs <;> simp only [hs, iff_true_iff, iff_false_iff, not_lt] exacts [⟨fun H ↦ ⟨⟨(left_lt_add_div_two.2 (I.lower_lt_upper i)).trans H.1, H.2⟩, H.1⟩, fun H ↦ ⟨H.2, H.1.2⟩⟩, ⟨fun H...
import Mathlib.Analysis.SpecialFunctions.Pow.Complex import Qq #align_import analysis.special_functions.pow.real from "leanprover-community/mathlib"@"4fa54b337f7d52805480306db1b1439c741848c8" noncomputable section open scoped Classical open Real ComplexConjugate open Finset Set namespace Real variable {x y z...
Mathlib/Analysis/SpecialFunctions/Pow/Real.lean
158
158
theorem one_rpow (x : ℝ) : (1 : ℝ) ^ x = 1 := by
simp [rpow_def]
import Mathlib.MeasureTheory.OuterMeasure.Basic open Filter Set open scoped ENNReal namespace MeasureTheory variable {α β F : Type*} [FunLike F (Set α) ℝ≥0∞] [OuterMeasureClass F α] {μ : F} {s t : Set α} def ae (μ : F) : Filter α := .ofCountableUnion (μ · = 0) (fun _S hSc ↦ (measure_sUnion_null_iff hSc).2) fu...
Mathlib/MeasureTheory/OuterMeasure/AE.lean
216
218
theorem union_ae_eq_right_of_ae_eq_empty (h : s =ᵐ[μ] (∅ : Set α)) : (s ∪ t : Set α) =ᵐ[μ] t := by
convert ae_eq_set_union h (ae_eq_refl t) rw [empty_union]
import Mathlib.Algebra.Algebra.Operations import Mathlib.Algebra.Algebra.Subalgebra.Prod import Mathlib.Algebra.Algebra.Subalgebra.Tower import Mathlib.LinearAlgebra.Basis import Mathlib.LinearAlgebra.Prod import Mathlib.LinearAlgebra.Finsupp import Mathlib.LinearAlgebra.Prod #align_import ring_theory.adjoin.basic fr...
Mathlib/RingTheory/Adjoin/Basic.lean
247
258
theorem mem_adjoin_of_map_mul {s} {x : A} {f : A →ₗ[R] B} (hf : ∀ a₁ a₂, f (a₁ * a₂) = f a₁ * f a₂) (h : x ∈ adjoin R s) : f x ∈ adjoin R (f '' (s ∪ {1})) := by
refine @adjoin_induction R A _ _ _ _ (fun a => f a ∈ adjoin R (f '' (s ∪ {1}))) x h (fun a ha => subset_adjoin ⟨a, ⟨Set.subset_union_left ha, rfl⟩⟩) (fun r => ?_) (fun y z hy hz => by simpa [hy, hz] using Subalgebra.add_mem _ hy hz) fun y z hy hz => by simpa [hy, hz, hf y z] using Subalgebra.mu...
import Mathlib.Data.Fin.Fin2 import Mathlib.Data.PFun import Mathlib.Data.Vector3 import Mathlib.NumberTheory.PellMatiyasevic #align_import number_theory.dioph from "leanprover-community/mathlib"@"a66d07e27d5b5b8ac1147cacfe353478e5c14002" open Fin2 Function Nat Sum local infixr:67 " ::ₒ " => Option.elim' local ...
Mathlib/NumberTheory/Dioph.lean
225
232
theorem induction {C : Poly α → Prop} (H1 : ∀ i, C (proj i)) (H2 : ∀ n, C (const n)) (H3 : ∀ f g, C f → C g → C (f - g)) (H4 : ∀ f g, C f → C g → C (f * g)) (f : Poly α) : C f := by
cases' f with f pf induction' pf with i n f g pf pg ihf ihg f g pf pg ihf ihg · apply H1 · apply H2 · apply H3 _ _ ihf ihg · apply H4 _ _ ihf ihg
import Mathlib.CategoryTheory.Preadditive.ProjectiveResolution import Mathlib.Algebra.Homology.HomotopyCategory import Mathlib.Tactic.SuppressCompilation suppress_compilation noncomputable section universe v u namespace CategoryTheory variable {C : Type u} [Category.{v} C] open Category Limits Projective set_...
Mathlib/CategoryTheory/Abelian/ProjectiveResolution.lean
99
102
theorem lift_commutes {Y Z : C} (f : Y ⟶ Z) (P : ProjectiveResolution Y) (Q : ProjectiveResolution Z) : lift f P Q ≫ Q.π = P.π ≫ (ChainComplex.single₀ C).map f := by
ext simp [lift, liftFZero, liftFOne]
import Mathlib.Algebra.Polynomial.AlgebraMap import Mathlib.Algebra.Polynomial.BigOperators import Mathlib.Algebra.Polynomial.Degree.Lemmas import Mathlib.Algebra.Polynomial.Div #align_import data.polynomial.ring_division from "leanprover-community/mathlib"@"8efcf8022aac8e01df8d302dcebdbc25d6a886c8" noncomputable ...
Mathlib/Algebra/Polynomial/RingDivision.lean
401
407
theorem nmem_nonZeroDivisors_iff {P : R[X]} : P ∉ R[X]⁰ ↔ ∃ a : R, a ≠ 0 ∧ a • P = 0 := by
refine ⟨fun hP ↦ ?_, fun ⟨a, ha, h⟩ h1 ↦ ha <| C_eq_zero.1 <| (h1 _) <| smul_eq_C_mul a ▸ h⟩ by_contra! h obtain ⟨Q, hQ⟩ := _root_.nmem_nonZeroDivisors_iff.1 hP refine hQ.2 (eq_zero_of_mul_eq_zero_of_smul P (fun a ha ↦ ?_) Q (mul_comm P _ ▸ hQ.1)) contrapose! ha exact h a ha
import Mathlib.Tactic.Qify import Mathlib.Data.ZMod.Basic import Mathlib.NumberTheory.DiophantineApproximation import Mathlib.NumberTheory.Zsqrtd.Basic #align_import number_theory.pell from "leanprover-community/mathlib"@"7ad820c4997738e2f542f8a20f32911f52020e26" namespace Pell open Zsqrtd theorem is_pell_s...
Mathlib/NumberTheory/Pell.lean
234
237
theorem d_pos_of_one_lt_x {a : Solution₁ d} (ha : 1 < a.x) : 0 < d := by
refine pos_of_mul_pos_left ?_ (sq_nonneg a.y) rw [a.prop_y, sub_pos] exact one_lt_pow ha two_ne_zero
import Mathlib.Order.Filter.AtTopBot #align_import order.filter.indicator_function from "leanprover-community/mathlib"@"8631e2d5ea77f6c13054d9151d82b83069680cb1" variable {α β M E : Type*} open Set Filter @[to_additive]
Mathlib/Order/Filter/IndicatorFunction.lean
63
66
theorem Monotone.mulIndicator_eventuallyEq_iUnion {ι} [Preorder ι] [One β] (s : ι → Set α) (hs : Monotone s) (f : α → β) (a : α) : (fun i => mulIndicator (s i) f a) =ᶠ[atTop] fun _ ↦ mulIndicator (⋃ i, s i) f a := by
classical exact hs.piecewise_eventually_eq_iUnion f 1 a
import Mathlib.Algebra.Ring.Divisibility.Basic import Mathlib.Init.Data.Ordering.Lemmas import Mathlib.SetTheory.Ordinal.Principal import Mathlib.Tactic.NormNum #align_import set_theory.ordinal.notation from "leanprover-community/mathlib"@"b67044ba53af18680e1dd246861d9584e968495d" set_option linter.uppercaseLean3 ...
Mathlib/SetTheory/Ordinal/Notation.lean
784
791
theorem nf_repr_split {o o' m} [NF o] (h : split o = (o', m)) : NF o' ∧ repr o = repr o' + m := by
cases' e : split' o with a n cases' nf_repr_split' e with s₁ s₂ rw [split_eq_scale_split' e] at h injection h; substs o' n simp only [repr_scale, repr, opow_zero, Nat.succPNat_coe, Nat.cast_one, mul_one, add_zero, opow_one, s₂.symm, and_true] infer_instance
import Mathlib.Analysis.Calculus.FDeriv.Basic import Mathlib.Analysis.NormedSpace.OperatorNorm.NormedSpace #align_import analysis.calculus.deriv.basic from "leanprover-community/mathlib"@"3bce8d800a6f2b8f63fe1e588fd76a9ff4adcebe" universe u v w noncomputable section open scoped Classical Topology Filter ENNReal ...
Mathlib/Analysis/Calculus/Deriv/Basic.lean
561
569
theorem derivWithin_Ioi_eq_Ici {E : Type*} [NormedAddCommGroup E] [NormedSpace ℝ E] (f : ℝ → E) (x : ℝ) : derivWithin f (Ioi x) x = derivWithin f (Ici x) x := by
by_cases H : DifferentiableWithinAt ℝ f (Ioi x) x · have A := H.hasDerivWithinAt.Ici_of_Ioi have B := (differentiableWithinAt_Ioi_iff_Ici.1 H).hasDerivWithinAt simpa using (uniqueDiffOn_Ici x).eq left_mem_Ici A B · rw [derivWithin_zero_of_not_differentiableWithinAt H, derivWithin_zero_of_not_differ...
import Mathlib.Topology.Constructions #align_import topology.continuous_on from "leanprover-community/mathlib"@"d4f691b9e5f94cfc64639973f3544c95f8d5d494" open Set Filter Function Topology Filter variable {α : Type*} {β : Type*} {γ : Type*} {δ : Type*} variable [TopologicalSpace α] @[simp] theorem nhds_bind_nhdsW...
Mathlib/Topology/ContinuousOn.lean
75
76
theorem nhdsWithin_univ (a : α) : 𝓝[Set.univ] a = 𝓝 a := by
rw [nhdsWithin, principal_univ, inf_top_eq]
import Mathlib.Order.Filter.Basic import Mathlib.Order.Filter.CountableInter import Mathlib.SetTheory.Cardinal.Ordinal import Mathlib.SetTheory.Cardinal.Cofinality open Set Filter Cardinal universe u variable {ι : Type u} {α β : Type u} {c : Cardinal.{u}} class CardinalInterFilter (l : Filter α) (c : Cardinal.{...
Mathlib/Order/Filter/CardinalInter.lean
102
105
theorem eventually_cardinal_forall {p : α → ι → Prop} (hic : #ι < c) : (∀ᶠ x in l, ∀ i, p x i) ↔ ∀ i, ∀ᶠ x in l, p x i := by
simp only [Filter.Eventually, setOf_forall] exact cardinal_iInter_mem hic
import Mathlib.SetTheory.Cardinal.Ordinal #align_import set_theory.cardinal.continuum from "leanprover-community/mathlib"@"e08a42b2dd544cf11eba72e5fc7bf199d4349925" namespace Cardinal universe u v open Cardinal def continuum : Cardinal.{u} := 2 ^ ℵ₀ #align cardinal.continuum Cardinal.continuum scoped notat...
Mathlib/SetTheory/Cardinal/Continuum.lean
52
54
theorem lift_le_continuum {c : Cardinal.{u}} : lift.{v} c ≤ 𝔠 ↔ c ≤ 𝔠 := by
-- Porting note: added explicit universes rw [← lift_continuum.{u,v}, lift_le]
import Mathlib.CategoryTheory.Adjunction.Whiskering import Mathlib.CategoryTheory.Sites.PreservesSheafification #align_import category_theory.sites.adjunction from "leanprover-community/mathlib"@"70fd9563a21e7b963887c9360bd29b2393e6225a" namespace CategoryTheory open GrothendieckTopology CategoryTheory Limits Op...
Mathlib/CategoryTheory/Sites/Adjunction.lean
148
160
theorem adjunctionToTypes_counit_app_val {G : Type max v u ⥤ D} (adj : G ⊣ forget D) (X : Sheaf J D) : ((adjunctionToTypes J adj).counit.app X).val = sheafifyLift J ((Functor.associator _ _ _).hom ≫ (adj.whiskerRight _).counit.app _) X.2 := by
apply sheafifyLift_unique dsimp only [adjunctionToTypes, Adjunction.comp, NatTrans.comp_app, instCategorySheaf_comp_val, instCategorySheaf_id_val] rw [adjunction_counit_app_val] erw [Category.id_comp, sheafifyMap_sheafifyLift, toSheafify_sheafifyLift] ext dsimp [sheafEquivSheafOfTypes, Equivalence.symm...
import Mathlib.Algebra.Order.Ring.Basic import Mathlib.Algebra.Order.Ring.Int import Mathlib.Algebra.Ring.Divisibility.Basic import Mathlib.Data.Nat.Cast.Order #align_import algebra.order.ring.abs from "leanprover-community/mathlib"@"10b4e499f43088dd3bb7b5796184ad5216648ab1" #align_import data.nat.parity from "leanpr...
Mathlib/Algebra/Order/Ring/Abs.lean
192
193
theorem abs_dvd (a b : α) : |a| ∣ b ↔ a ∣ b := by
cases' abs_choice a with h h <;> simp only [h, neg_dvd]
import Mathlib.Algebra.IsPrimePow import Mathlib.Data.Nat.Factorization.Basic #align_import data.nat.factorization.prime_pow from "leanprover-community/mathlib"@"6ca1a09bc9aa75824bf97388c9e3b441fc4ccf3f" variable {R : Type*} [CommMonoidWithZero R] (n p : R) (k : ℕ) theorem IsPrimePow.minFac_pow_factorization_eq ...
Mathlib/Data/Nat/Factorization/PrimePow.lean
63
73
theorem IsPrimePow.exists_ord_compl_eq_one {n : ℕ} (h : IsPrimePow n) : ∃ p : ℕ, p.Prime ∧ ord_compl[p] n = 1 := by
rcases eq_or_ne n 0 with (rfl | hn0); · cases not_isPrimePow_zero h rcases isPrimePow_iff_factorization_eq_single.mp h with ⟨p, k, hk0, h1⟩ rcases em' p.Prime with (pp | pp) · refine absurd ?_ hk0.ne' simp [← Nat.factorization_eq_zero_of_non_prime n pp, h1] refine ⟨p, pp, ?_⟩ refine Nat.eq_of_factoriza...
import Mathlib.Order.Filter.Lift import Mathlib.Topology.Defs.Filter #align_import topology.basic from "leanprover-community/mathlib"@"e354e865255654389cc46e6032160238df2e0f40" noncomputable section open Set Filter universe u v w x def TopologicalSpace.ofClosed {X : Type u} (T : Set (Set X)) (empty_mem : ∅ ∈...
Mathlib/Topology/Basic.lean
1,045
1,047
theorem clusterPt_principal_iff_frequently : ClusterPt x (𝓟 s) ↔ ∃ᶠ y in 𝓝 x, y ∈ s := by
simp only [clusterPt_principal_iff, frequently_iff, Set.Nonempty, exists_prop, mem_inter_iff]
import Mathlib.GroupTheory.OrderOfElement import Mathlib.Data.Finset.NoncommProd import Mathlib.Data.Fintype.BigOperators import Mathlib.Data.Nat.GCD.BigOperators import Mathlib.Order.SupIndep #align_import group_theory.noncomm_pi_coprod from "leanprover-community/mathlib"@"6f9f36364eae3f42368b04858fd66d6d9ae730d8" ...
Mathlib/GroupTheory/NoncommPiCoprod.lean
125
137
theorem noncommPiCoprod_mulSingle (i : ι) (y : N i) : noncommPiCoprod ϕ hcomm (Pi.mulSingle i y) = ϕ i y := by
change Finset.univ.noncommProd (fun j => ϕ j (Pi.mulSingle i y j)) (fun _ _ _ _ h => hcomm h _ _) = ϕ i y rw [← Finset.insert_erase (Finset.mem_univ i)] rw [Finset.noncommProd_insert_of_not_mem _ _ _ _ (Finset.not_mem_erase i _)] rw [Pi.mulSingle_eq_same] rw [Finset.noncommProd_eq_pow_card] · rw [one_p...
import Mathlib.Data.Fintype.Option import Mathlib.Data.Fintype.Prod import Mathlib.Data.Fintype.Pi import Mathlib.Data.Vector.Basic import Mathlib.Data.PFun import Mathlib.Logic.Function.Iterate import Mathlib.Order.Basic import Mathlib.Tactic.ApplyFun #align_import computability.turing_machine from "leanprover-commu...
Mathlib/Computability/TuringMachine.lean
869
875
theorem reaches_eval {σ} {f : σ → Option σ} {a b} (ab : Reaches f a b) : eval f a = eval f b := by
refine Part.ext fun _ ↦ ⟨fun h ↦ ?_, fun h ↦ ?_⟩ · have ⟨ac, c0⟩ := mem_eval.1 h exact mem_eval.2 ⟨(or_iff_left_of_imp fun cb ↦ (eval_maximal h).1 cb ▸ ReflTransGen.refl).1 (reaches_total ab ac), c0⟩ · have ⟨bc, c0⟩ := mem_eval.1 h exact mem_eval.2 ⟨ab.trans bc, c0⟩
import Mathlib.Data.ZMod.Basic import Mathlib.GroupTheory.Index import Mathlib.GroupTheory.GroupAction.ConjAct import Mathlib.GroupTheory.GroupAction.Quotient import Mathlib.GroupTheory.Perm.Cycle.Type import Mathlib.GroupTheory.SpecificGroups.Cyclic import Mathlib.Tactic.IntervalCases #align_import group_theory.p_gr...
Mathlib/GroupTheory/PGroup.lean
144
152
theorem card_eq_or_dvd : Nat.card G = 1 ∨ p ∣ Nat.card G := by
cases fintypeOrInfinite G · obtain ⟨n, hn⟩ := iff_card.mp hG rw [Nat.card_eq_fintype_card, hn] cases' n with n n · exact Or.inl rfl · exact Or.inr ⟨p ^ n, by rw [pow_succ']⟩ · rw [Nat.card_eq_zero_of_infinite] exact Or.inr ⟨0, rfl⟩
import Mathlib.Topology.Compactness.SigmaCompact import Mathlib.Topology.Connected.TotallyDisconnected import Mathlib.Topology.Inseparable #align_import topology.separation from "leanprover-community/mathlib"@"d91e7f7a7f1c7e9f0e18fdb6bde4f652004c735d" open Function Set Filter Topology TopologicalSpace open scoped...
Mathlib/Topology/Separation.lean
864
866
theorem continuousAt_of_tendsto_nhds [TopologicalSpace Y] [T1Space Y] {f : X → Y} {x : X} {y : Y} (h : Tendsto f (𝓝 x) (𝓝 y)) : ContinuousAt f x := by
rwa [ContinuousAt, eq_of_tendsto_nhds h]
import Mathlib.NumberTheory.ZetaValues import Mathlib.NumberTheory.LSeries.RiemannZeta open Complex Real Set open scoped Nat namespace HurwitzZeta variable {k : ℕ} {x : ℝ} theorem cosZeta_two_mul_nat (hk : k ≠ 0) (hx : x ∈ Icc 0 1) : cosZeta x (2 * k) = (-1) ^ (k + 1) * (2 * π) ^ (2 * k) / 2 / (2 * k)! * ...
Mathlib/NumberTheory/LSeries/HurwitzZetaValues.lean
113
124
theorem sinZeta_two_mul_nat_add_one' (hk : k ≠ 0) (hx : x ∈ Icc (0 : ℝ) 1) : sinZeta x (2 * k + 1) = (-1) ^ (k + 1) / (2 * k + 1) / Gammaℂ (2 * k + 1) * ((Polynomial.bernoulli (2 * k + 1)).map (algebraMap ℚ ℂ)).eval (x : ℂ) := by
rw [sinZeta_two_mul_nat_add_one hk hx] congr 1 have : (2 * k + 1)! = (2 * k + 1) * Complex.Gamma (2 * k + 1) := by rw [(by simp : Complex.Gamma (2 * k + 1) = Complex.Gamma (↑(2 * k) + 1)), Complex.Gamma_nat_eq_factorial, ← Nat.cast_ofNat (R := ℂ), ← Nat.cast_mul, ← Nat.cast_add_one, ← Nat.cast_m...
import Mathlib.Topology.Instances.ENNReal import Mathlib.MeasureTheory.Measure.Dirac #align_import probability.probability_mass_function.basic from "leanprover-community/mathlib"@"4ac69b290818724c159de091daa3acd31da0ee6d" noncomputable section variable {α β γ : Type*} open scoped Classical open NNReal ENNReal M...
Mathlib/Probability/ProbabilityMassFunction/Basic.lean
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theorem toOuterMeasure_apply_singleton (a : α) : p.toOuterMeasure {a} = p a := by
refine (p.toOuterMeasure_apply {a}).trans ((tsum_eq_single a fun b hb => ?_).trans ?_) · exact ite_eq_right_iff.2 fun hb' => False.elim <| hb hb' · exact ite_eq_left_iff.2 fun ha' => False.elim <| ha' rfl
import Mathlib.Topology.Algebra.Constructions import Mathlib.Topology.Bases import Mathlib.Topology.UniformSpace.Basic #align_import topology.uniform_space.cauchy from "leanprover-community/mathlib"@"22131150f88a2d125713ffa0f4693e3355b1eb49" universe u v open scoped Classical open Filter TopologicalSpace Set Uni...
Mathlib/Topology/UniformSpace/Cauchy.lean
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theorem cauchySeq_iff {u : ℕ → α} : CauchySeq u ↔ ∀ V ∈ 𝓤 α, ∃ N, ∀ k ≥ N, ∀ l ≥ N, (u k, u l) ∈ V := by
simp only [cauchySeq_iff', Filter.eventually_atTop_prod_self', mem_preimage, Prod.map_apply]
import Mathlib.Data.Fin.VecNotation import Mathlib.GroupTheory.Abelianization import Mathlib.GroupTheory.Perm.ViaEmbedding import Mathlib.GroupTheory.Subgroup.Simple import Mathlib.SetTheory.Cardinal.Basic #align_import group_theory.solvable from "leanprover-community/mathlib"@"dc6c365e751e34d100e80fe6e314c3c3e0fd298...
Mathlib/GroupTheory/Solvable.lean
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theorem derivedSeries_normal (n : ℕ) : (derivedSeries G n).Normal := by
induction' n with n ih · exact (⊤ : Subgroup G).normal_of_characteristic · exact @Subgroup.commutator_normal G _ (derivedSeries G n) (derivedSeries G n) ih ih
import Mathlib.SetTheory.Ordinal.Basic import Mathlib.Data.Nat.SuccPred #align_import set_theory.ordinal.arithmetic from "leanprover-community/mathlib"@"31b269b60935483943542d547a6dd83a66b37dc7" assert_not_exists Field assert_not_exists Module noncomputable section open Function Cardinal Set Equiv Order open sc...
Mathlib/SetTheory/Ordinal/Arithmetic.lean
2,039
2,041
theorem exists_of_lt_mex {ι} {f : ι → Ordinal} {a} (ha : a < mex f) : ∃ i, f i = a := by
by_contra! ha' exact ha.not_le (mex_le_of_ne ha')
import Mathlib.Algebra.GroupWithZero.Divisibility import Mathlib.Algebra.Order.Ring.Nat import Mathlib.Tactic.NthRewrite #align_import data.nat.gcd.basic from "leanprover-community/mathlib"@"e8638a0fcaf73e4500469f368ef9494e495099b3" namespace Nat theorem gcd_greatest {a b d : ℕ} (hda : d ∣ a) (hdb : d ∣ b) (hd ...
Mathlib/Data/Nat/GCD/Basic.lean
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theorem coprime_mul_left_add_right (m n k : ℕ) : Coprime m (m * k + n) ↔ Coprime m n := by
rw [Coprime, Coprime, gcd_mul_left_add_right]
import Mathlib.Algebra.Polynomial.AlgebraMap import Mathlib.FieldTheory.Minpoly.IsIntegrallyClosed import Mathlib.RingTheory.PowerBasis #align_import ring_theory.is_adjoin_root from "leanprover-community/mathlib"@"f7fc89d5d5ff1db2d1242c7bb0e9062ce47ef47c" open scoped Polynomial open Polynomial noncomputable sec...
Mathlib/RingTheory/IsAdjoinRoot.lean
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theorem lift_algebraMap (h : IsAdjoinRoot S f) (a : R) : h.lift i x hx (algebraMap R S a) = i a := by
rw [h.algebraMap_apply, lift_map, eval₂_C]
import Mathlib.Algebra.Order.Field.Basic import Mathlib.Data.Nat.Cast.Order import Mathlib.Data.Nat.Choose.Basic import Mathlib.Data.Nat.Cast.Order #align_import data.nat.choose.bounds from "leanprover-community/mathlib"@"550b58538991c8977703fdeb7c9d51a5aa27df11" open Nat variable {α : Type*} [LinearOrderedSemif...
Mathlib/Data/Nat/Choose/Bounds.lean
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theorem choose_le_pow (r n : ℕ) : (n.choose r : α) ≤ (n ^ r : α) / r ! := by
rw [le_div_iff'] · norm_cast rw [← Nat.descFactorial_eq_factorial_mul_choose] exact n.descFactorial_le_pow r exact mod_cast r.factorial_pos
import Mathlib.Tactic.Ring import Mathlib.Data.PNat.Prime #align_import data.pnat.xgcd from "leanprover-community/mathlib"@"6afc9b06856ad973f6a2619e3e8a0a8d537a58f2" open Nat namespace PNat structure XgcdType where wp : ℕ x : ℕ y : ℕ zp : ℕ ap : ℕ bp : ℕ deriving Inhabited #alig...
Mathlib/Data/PNat/Xgcd.lean
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theorem finish_isReduced : u.finish.IsReduced := by
dsimp [IsReduced] rfl
import Mathlib.GroupTheory.Solvable import Mathlib.FieldTheory.PolynomialGaloisGroup import Mathlib.RingTheory.RootsOfUnity.Basic #align_import field_theory.abel_ruffini from "leanprover-community/mathlib"@"e3f4be1fcb5376c4948d7f095bec45350bfb9d1a" noncomputable section open scoped Classical Polynomial Intermedi...
Mathlib/FieldTheory/AbelRuffini.lean
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theorem gal_X_isSolvable : IsSolvable (X : F[X]).Gal := by
infer_instance