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import Mathlib.Algebra.Field.Basic import Mathlib.Algebra.Order.Group.Basic import Mathlib.Algebra.Order.Ring.Basic import Mathlib.RingTheory.Int.Basic import Mathlib.Tactic.Ring import Mathlib.Tactic.FieldSimp import Mathlib.Data.Int.NatPrime import Mathlib.Data.ZMod.Basic #align_import number_theory.pythagorean_tri...
Mathlib/NumberTheory/PythagoreanTriples.lean
164
182
theorem gcd_dvd : (Int.gcd x y : ℤ) ∣ z := by
by_cases h0 : Int.gcd x y = 0 · have hx : x = 0 := by apply Int.natAbs_eq_zero.mp apply Nat.eq_zero_of_gcd_eq_zero_left h0 have hy : y = 0 := by apply Int.natAbs_eq_zero.mp apply Nat.eq_zero_of_gcd_eq_zero_right h0 have hz : z = 0 := by simpa only [PythagoreanTriple, hx, hy, a...
import Mathlib.Data.Finset.Sort import Mathlib.Data.List.FinRange import Mathlib.Data.Prod.Lex import Mathlib.GroupTheory.Perm.Basic import Mathlib.Order.Interval.Finset.Fin #align_import data.fin.tuple.sort from "leanprover-community/mathlib"@"8631e2d5ea77f6c13054d9151d82b83069680cb1" namespace Tuple open List ...
Mathlib/Data/Fin/Tuple/Sort.lean
120
145
theorem lt_card_le_iff_apply_le_of_monotone [PartialOrder α] [DecidableRel (α := α) LE.le] {m : ℕ} (f : Fin m → α) (a : α) (h_sorted : Monotone f) (j : Fin m) : j < Fintype.card {i // f i ≤ a} ↔ f j ≤ a := by
suffices h1 : ∀ k : Fin m, (k < Fintype.card {i // f i ≤ a}) → f k ≤ a by refine ⟨h1 j, fun h ↦ ?_⟩ by_contra! hc let p : Fin m → Prop := fun x ↦ f x ≤ a let q : Fin m → Prop := fun x ↦ x < Fintype.card {i // f i ≤ a} let q' : {i // f i ≤ a} → Prop := fun x ↦ q x have hw : 0 < Fintype.card {j...
import Mathlib.MeasureTheory.Group.Action import Mathlib.MeasureTheory.Integral.SetIntegral import Mathlib.MeasureTheory.Group.Pointwise #align_import measure_theory.group.fundamental_domain from "leanprover-community/mathlib"@"3b52265189f3fb43aa631edffce5d060fafaf82f" open scoped ENNReal Pointwise Topology NNRea...
Mathlib/MeasureTheory/Group/FundamentalDomain.lean
290
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theorem set_lintegral_eq_tsum' (h : IsFundamentalDomain G s μ) (f : α → ℝ≥0∞) (t : Set α) : ∫⁻ x in t, f x ∂μ = ∑' g : G, ∫⁻ x in g • t ∩ s, f (g⁻¹ • x) ∂μ := calc ∫⁻ x in t, f x ∂μ = ∑' g : G, ∫⁻ x in t ∩ g • s, f x ∂μ := h.set_lintegral_eq_tsum f t _ = ∑' g : G, ∫⁻ x in t ∩ g⁻¹ • s, f x ∂μ := ((Equiv.in...
simp only [smul_set_inter, inv_smul_smul] _ = ∑' g : G, ∫⁻ x in g • t ∩ s, f (g⁻¹ • x) ∂μ := tsum_congr fun g => Eq.symm <| (measurePreserving_smul g⁻¹ μ).set_lintegral_comp_emb (measurableEmbedding_const_smul _) _ _
import Mathlib.AlgebraicTopology.DoldKan.EquivalenceAdditive import Mathlib.AlgebraicTopology.DoldKan.Compatibility import Mathlib.CategoryTheory.Idempotents.SimplicialObject #align_import algebraic_topology.dold_kan.equivalence_pseudoabelian from "leanprover-community/mathlib"@"32a7e535287f9c73f2e4d2aef306a39190f0b5...
Mathlib/AlgebraicTopology/DoldKan/EquivalencePseudoabelian.lean
129
144
theorem hε : Compatibility.υ (isoN₁) = (Γ₂N₁ : (toKaroubiEquivalence _).functor ≅ (N₁ : SimplicialObject C ⥤ _) ⋙ Preadditive.DoldKan.equivalence.inverse) := by
dsimp only [isoN₁] ext1 rw [← cancel_epi Γ₂N₁.inv, Iso.inv_hom_id] ext X : 2 rw [NatTrans.comp_app] erw [compatibility_Γ₂N₁_Γ₂N₂_natTrans X] rw [Compatibility.υ_hom_app, Preadditive.DoldKan.equivalence_unitIso, Iso.app_inv, assoc] erw [← NatTrans.comp_app_assoc, IsIso.hom_inv_id] rw [NatTrans.id_app,...
import Mathlib.CategoryTheory.Preadditive.AdditiveFunctor import Mathlib.CategoryTheory.Monoidal.Functor #align_import category_theory.monoidal.preadditive from "leanprover-community/mathlib"@"986c4d5761f938b2e1c43c01f001b6d9d88c2055" noncomputable section open scoped Classical namespace CategoryTheory open Cat...
Mathlib/CategoryTheory/Monoidal/Preadditive.lean
171
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theorem leftDistributor_hom_comp_biproduct_π {J : Type} [Fintype J] (X : C) (f : J → C) (j : J) : (leftDistributor X f).hom ≫ biproduct.π _ j = X ◁ biproduct.π _ j := by
simp [leftDistributor_hom, Preadditive.sum_comp, biproduct.ι_π, comp_dite]
import Mathlib.Algebra.BigOperators.Group.Finset #align_import data.nat.gcd.big_operators from "leanprover-community/mathlib"@"008205aa645b3f194c1da47025c5f110c8406eab" namespace Nat variable {ι : Type*} theorem coprime_list_prod_left_iff {l : List ℕ} {k : ℕ} : Coprime l.prod k ↔ ∀ n ∈ l, Coprime n k := by ...
Mathlib/Data/Nat/GCD/BigOperators.lean
40
42
theorem coprime_prod_right_iff {x : ℕ} {t : Finset ι} {s : ι → ℕ} : Coprime x (∏ i ∈ t, s i) ↔ ∀ i ∈ t, Coprime x (s i) := by
simpa using coprime_multiset_prod_right_iff (m := t.val.map s)
import Mathlib.Analysis.Calculus.Deriv.Pow import Mathlib.Analysis.Calculus.MeanValue #align_import analysis.calculus.fderiv_symmetric from "leanprover-community/mathlib"@"2c1d8ca2812b64f88992a5294ea3dba144755cd1" open Asymptotics Set open scoped Topology variable {E F : Type*} [NormedAddCommGroup E] [NormedSpa...
Mathlib/Analysis/Calculus/FDeriv/Symmetric.lean
68
172
theorem Convex.taylor_approx_two_segment {v w : E} (hv : x + v ∈ interior s) (hw : x + v + w ∈ interior s) : (fun h : ℝ => f (x + h • v + h • w) - f (x + h • v) - h • f' x w - h ^ 2 • f'' v w - (h ^ 2 / 2) • f'' w w) =o[𝓝[>] 0] fun h => h ^ 2 := by
-- it suffices to check that the expression is bounded by `ε * ((‖v‖ + ‖w‖) * ‖w‖) * h^2` for -- small enough `h`, for any positive `ε`. refine IsLittleO.trans_isBigO (isLittleO_iff.2 fun ε εpos => ?_) (isBigO_const_mul_self ((‖v‖ + ‖w‖) * ‖w‖) _ _) -- consider a ball of radius `δ` around `x` in which the ...
import Mathlib.FieldTheory.IsAlgClosed.AlgebraicClosure import Mathlib.FieldTheory.Galois universe u v w open scoped Classical Polynomial open Polynomial variable (k : Type u) [Field k] (K : Type v) [Field K] class IsSepClosed : Prop where splits_of_separable : ∀ p : k[X], p.Separable → (p.Splits <| RingHom....
Mathlib/FieldTheory/IsSepClosed.lean
118
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theorem exists_eq_mul_self [IsSepClosed k] (x : k) [h2 : NeZero (2 : k)] : ∃ z, x = z * z := by
rcases exists_pow_nat_eq x 2 with ⟨z, rfl⟩ exact ⟨z, sq z⟩
import Mathlib.CategoryTheory.Monoidal.Braided.Basic import Mathlib.CategoryTheory.Monoidal.Discrete import Mathlib.CategoryTheory.Monoidal.CoherenceLemmas import Mathlib.CategoryTheory.Limits.Shapes.Terminal import Mathlib.Algebra.PUnitInstances #align_import category_theory.monoidal.Mon_ from "leanprover-community/...
Mathlib/CategoryTheory/Monoidal/Mon_.lean
80
81
theorem mul_one_hom {Z : C} (f : Z ⟶ M.X) : (f ⊗ M.one) ≫ M.mul = (ρ_ Z).hom ≫ f := by
rw [tensorHom_def_assoc, M.mul_one, rightUnitor_naturality]
import Mathlib.Analysis.Convex.Side import Mathlib.Geometry.Euclidean.Angle.Oriented.Rotation import Mathlib.Geometry.Euclidean.Angle.Unoriented.Affine #align_import geometry.euclidean.angle.oriented.affine from "leanprover-community/mathlib"@"46b633fd842bef9469441c0209906f6dddd2b4f5" noncomputable section open ...
Mathlib/Geometry/Euclidean/Angle/Oriented/Affine.lean
630
633
theorem _root_.Sbtw.oangle_eq_left_right {p₁ p₁' p₂ p₃ p₃' : P} (h₁ : Sbtw ℝ p₁ p₂ p₁') (h₃ : Sbtw ℝ p₃ p₂ p₃') : ∡ p₁ p₂ p₃ = ∡ p₁' p₂ p₃' := by
rw [h₁.oangle_eq_add_pi_left h₃.left_ne, h₃.oangle_eq_add_pi_right h₁.right_ne, add_assoc, Real.Angle.coe_pi_add_coe_pi, add_zero]
import Mathlib.Tactic.FinCases import Mathlib.Data.Nat.Choose.Sum import Mathlib.LinearAlgebra.Finsupp import Mathlib.Algebra.Field.IsField #align_import ring_theory.ideal.basic from "leanprover-community/mathlib"@"dc6c365e751e34d100e80fe6e314c3c3e0fd2988" universe u v w variable {α : Type u} {β : Type v} open ...
Mathlib/RingTheory/Ideal/Basic.lean
811
817
theorem exists_not_isUnit_of_not_isField [Nontrivial R] (hf : ¬IsField R) : ∃ (x : R) (_hx : x ≠ (0 : R)), ¬IsUnit x := by
have : ¬_ := fun h => hf ⟨exists_pair_ne R, mul_comm, h⟩ simp_rw [isUnit_iff_exists_inv] push_neg at this ⊢ obtain ⟨x, hx, not_unit⟩ := this exact ⟨x, hx, not_unit⟩
import Mathlib.Algebra.Polynomial.Expand import Mathlib.Algebra.Polynomial.Splits import Mathlib.Algebra.Squarefree.Basic import Mathlib.FieldTheory.Minpoly.Field import Mathlib.RingTheory.PowerBasis #align_import field_theory.separable from "leanprover-community/mathlib"@"92ca63f0fb391a9ca5f22d2409a6080e786d99f7" ...
Mathlib/FieldTheory/Separable.lean
189
197
theorem multiplicity_le_one_of_separable {p q : R[X]} (hq : ¬IsUnit q) (hsep : Separable p) : multiplicity q p ≤ 1 := by
contrapose! hq apply isUnit_of_self_mul_dvd_separable hsep rw [← sq] apply multiplicity.pow_dvd_of_le_multiplicity have h : ⟨Part.Dom 1 ∧ Part.Dom 1, fun _ ↦ 2⟩ ≤ multiplicity q p := PartENat.add_one_le_of_lt hq rw [and_self] at h exact h
import Mathlib.Analysis.SpecialFunctions.Pow.NNReal import Mathlib.Analysis.SpecialFunctions.Pow.Continuity import Mathlib.Analysis.SumOverResidueClass #align_import analysis.p_series from "leanprover-community/mathlib"@"0b9eaaa7686280fad8cce467f5c3c57ee6ce77f8" def SuccDiffBounded (C : ℕ) (u : ℕ → ℕ) : Prop :=...
Mathlib/Analysis/PSeries.lean
84
98
theorem sum_schlomilch_le' (hf : ∀ ⦃m n⦄, 1 < m → m ≤ n → f n ≤ f m) (h_pos : ∀ n, 0 < u n) (hu : Monotone u) (n : ℕ) : (∑ k ∈ range n, (u (k + 1) - u k) • f (u (k + 1))) ≤ ∑ k ∈ Ico (u 0 + 1) (u n + 1), f k := by
induction' n with n ihn · simp suffices (u (n + 1) - u n) • f (u (n + 1)) ≤ ∑ k ∈ Ico (u n + 1) (u (n + 1) + 1), f k by rw [sum_range_succ, ← sum_Ico_consecutive] exacts [add_le_add ihn this, (add_le_add_right (hu n.zero_le) _ : u 0 + 1 ≤ u n + 1), add_le_add_right (hu n.le_succ) _] have : ...
import Mathlib.Algebra.GroupWithZero.Divisibility import Mathlib.Algebra.Ring.Divisibility.Basic import Mathlib.Algebra.Ring.Hom.Defs import Mathlib.GroupTheory.GroupAction.Units import Mathlib.Logic.Basic import Mathlib.Tactic.Ring #align_import ring_theory.coprime.basic from "leanprover-community/mathlib"@"a95b16cb...
Mathlib/RingTheory/Coprime/Basic.lean
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theorem IsRelPrime.of_add_mul_left_right (h : IsRelPrime x (y + x * z)) : IsRelPrime x y := by
rw [isRelPrime_comm] at h ⊢ exact h.of_add_mul_left_left
import Mathlib.Geometry.Manifold.VectorBundle.Tangent #align_import geometry.manifold.mfderiv from "leanprover-community/mathlib"@"e473c3198bb41f68560cab68a0529c854b618833" noncomputable section open scoped Classical Topology Manifold open Set ChartedSpace section DerivativesDefinitions variable {𝕜 : Type*} ...
Mathlib/Geometry/Manifold/MFDeriv/Defs.lean
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theorem mdifferentiableAt_iff (f : M → M') (x : M) : MDifferentiableAt I I' f x ↔ ContinuousAt f x ∧ DifferentiableWithinAt 𝕜 (writtenInExtChartAt I I' x f) (range I) ((extChartAt I x) x) := by
rw [MDifferentiableAt, liftPropAt_iff] congrm _ ∧ ?_ simp [DifferentiableWithinAtProp, Set.univ_inter] -- Porting note: `rfl` wasn't needed rfl
import Mathlib.Algebra.Star.Basic import Mathlib.Algebra.Order.CauSeq.Completion #align_import data.real.basic from "leanprover-community/mathlib"@"cb42593171ba005beaaf4549fcfe0dece9ada4c9" assert_not_exists Finset assert_not_exists Module assert_not_exists Submonoid assert_not_exists FloorRing structure Real w...
Mathlib/Data/Real/Basic.lean
316
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theorem mk_zero : mk 0 = 0 := by
rw [← ofCauchy_zero]; rfl
import Mathlib.Algebra.Category.ModuleCat.Adjunctions import Mathlib.Algebra.Category.ModuleCat.Limits import Mathlib.Algebra.Category.ModuleCat.Colimits import Mathlib.Algebra.Category.ModuleCat.Monoidal.Symmetric import Mathlib.CategoryTheory.Elementwise import Mathlib.RepresentationTheory.Action.Monoidal import Mat...
Mathlib/RepresentationTheory/Rep.lean
598
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theorem to_Module_monoidAlgebra_map_aux {k G : Type*} [CommRing k] [Monoid G] (V W : Type*) [AddCommGroup V] [AddCommGroup W] [Module k V] [Module k W] (ρ : G →* V →ₗ[k] V) (σ : G →* W →ₗ[k] W) (f : V →ₗ[k] W) (w : ∀ g : G, f.comp (ρ g) = (σ g).comp f) (r : MonoidAlgebra k G) (x : V) : f ((((MonoidAlgeb...
apply MonoidAlgebra.induction_on r · intro g simp only [one_smul, MonoidAlgebra.lift_single, MonoidAlgebra.of_apply] exact LinearMap.congr_fun (w g) x · intro g h gw hw; simp only [map_add, add_left_inj, LinearMap.add_apply, hw, gw] · intro r g w simp only [AlgHom.map_smul, w, RingHom.id_apply, Lin...
import Mathlib.Data.Matrix.Invertible import Mathlib.LinearAlgebra.Matrix.NonsingularInverse import Mathlib.LinearAlgebra.Matrix.PosDef #align_import linear_algebra.matrix.schur_complement from "leanprover-community/mathlib"@"a176cb1219e300e85793d44583dede42377b51af" variable {l m n α : Type*} namespace Matrix ...
Mathlib/LinearAlgebra/Matrix/SchurComplement.lean
184
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theorem isUnit_fromBlocks_zero₂₁ {A : Matrix m m α} {B : Matrix m n α} {D : Matrix n n α} : IsUnit (fromBlocks A B 0 D) ↔ IsUnit A ∧ IsUnit D := by
simp only [← nonempty_invertible_iff_isUnit, ← nonempty_prod, (fromBlocksZero₂₁InvertibleEquiv _ _ _).nonempty_congr]
import Mathlib.Probability.ProbabilityMassFunction.Monad #align_import probability.probability_mass_function.constructions from "leanprover-community/mathlib"@"4ac69b290818724c159de091daa3acd31da0ee6d" universe u namespace PMF noncomputable section variable {α β γ : Type*} open scoped Classical open NNReal ENN...
Mathlib/Probability/ProbabilityMassFunction/Constructions.lean
87
88
theorem map_const : p.map (Function.const α b) = pure b := by
simp only [map, Function.comp, bind_const, Function.const]
import Mathlib.Combinatorics.Quiver.Basic import Mathlib.Combinatorics.Quiver.Path #align_import combinatorics.quiver.cast from "leanprover-community/mathlib"@"fc2ed6f838ce7c9b7c7171e58d78eaf7b438fb0e" universe v v₁ v₂ u u₁ u₂ variable {U : Type*} [Quiver.{u + 1} U] namespace Quiver def Hom.cast {u v u' v...
Mathlib/Combinatorics/Quiver/Cast.lean
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theorem cast_eq_of_cons_eq_cons {u v v' w : U} {p : Path u v} {p' : Path u v'} {e : v ⟶ w} {e' : v' ⟶ w} (h : p.cons e = p'.cons e') : p.cast rfl (obj_eq_of_cons_eq_cons h) = p' := by
rw [Path.cast_eq_iff_heq] exact heq_of_cons_eq_cons h
import Mathlib.Data.Nat.Bitwise import Mathlib.SetTheory.Game.Birthday import Mathlib.SetTheory.Game.Impartial #align_import set_theory.game.nim from "leanprover-community/mathlib"@"92ca63f0fb391a9ca5f22d2409a6080e786d99f7" noncomputable section universe u namespace SetTheory open scoped PGame namespace PGame...
Mathlib/SetTheory/Game/Nim.lean
234
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theorem nim_add_equiv_zero_iff (o₁ o₂ : Ordinal) : (nim o₁ + nim o₂ ≈ 0) ↔ o₁ = o₂ := by
constructor · refine not_imp_not.1 fun hne : _ ≠ _ => (Impartial.not_equiv_zero_iff (nim o₁ + nim o₂)).2 ?_ wlog h : o₁ < o₂ · exact (fuzzy_congr_left add_comm_equiv).1 (this _ _ hne.symm (hne.lt_or_lt.resolve_left h)) rw [Impartial.fuzzy_zero_iff_gf, zero_lf_le, nim_def o₂] refine ⟨toLeftMovesAdd ...
import Mathlib.Algebra.BigOperators.Ring import Mathlib.Combinatorics.SimpleGraph.Density import Mathlib.Data.Nat.Cast.Field import Mathlib.Order.Partition.Equipartition import Mathlib.SetTheory.Ordinal.Basic #align_import combinatorics.simple_graph.regularity.uniform from "leanprover-community/mathlib"@"bf7ef0e83e5b...
Mathlib/Combinatorics/SimpleGraph/Regularity/Uniform.lean
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theorem not_isUniform_iff : ¬G.IsUniform ε s t ↔ ∃ s', s' ⊆ s ∧ ∃ t', t' ⊆ t ∧ ↑s.card * ε ≤ s'.card ∧ ↑t.card * ε ≤ t'.card ∧ ε ≤ |G.edgeDensity s' t' - G.edgeDensity s t| := by
unfold IsUniform simp only [not_forall, not_lt, exists_prop, exists_and_left, Rat.cast_abs, Rat.cast_sub]
import Mathlib.Data.Vector.Basic import Mathlib.Data.Vector.Snoc set_option autoImplicit true namespace Vector section Fold section Comm variable (xs ys : Vector α n) theorem map₂_comm (f : α → α → β) (comm : ∀ a₁ a₂, f a₁ a₂ = f a₂ a₁) : map₂ f xs ys = map₂ f ys xs := by induction xs, ys using Vec...
Mathlib/Data/Vector/MapLemmas.lean
373
375
theorem mapAccumr₂_comm (f : α → α → σ → σ × γ) (comm : ∀ a₁ a₂ s, f a₁ a₂ s = f a₂ a₁ s) : mapAccumr₂ f xs ys s = mapAccumr₂ f ys xs s := by
induction xs, ys using Vector.inductionOn₂ generalizing s <;> simp_all
import Mathlib.Algebra.ModEq import Mathlib.Algebra.Module.Defs import Mathlib.Algebra.Order.Archimedean import Mathlib.Algebra.Periodic import Mathlib.Data.Int.SuccPred import Mathlib.GroupTheory.QuotientGroup import Mathlib.Order.Circular import Mathlib.Data.List.TFAE import Mathlib.Data.Set.Lattice #align_import a...
Mathlib/Algebra/Order/ToIntervalMod.lean
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theorem toIocMod_eq_toIocMod : toIocMod hp a b = toIocMod hp a c ↔ ∃ n : ℤ, c - b = n • p := by
refine ⟨fun h => ⟨toIocDiv hp a c - toIocDiv hp a b, ?_⟩, fun h => ?_⟩ · conv_lhs => rw [← toIocMod_add_toIocDiv_zsmul hp a b, ← toIocMod_add_toIocDiv_zsmul hp a c] rw [h, sub_smul] abel · rcases h with ⟨z, hz⟩ rw [sub_eq_iff_eq_add] at hz rw [hz, toIocMod_zsmul_add]
import Mathlib.Analysis.Analytic.Basic import Mathlib.Analysis.Analytic.CPolynomial import Mathlib.Analysis.Calculus.Deriv.Basic import Mathlib.Analysis.Calculus.ContDiff.Defs import Mathlib.Analysis.Calculus.FDeriv.Add #align_import analysis.calculus.fderiv_analytic from "leanprover-community/mathlib"@"3bce8d800a6f2...
Mathlib/Analysis/Calculus/FDeriv/Analytic.lean
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theorem AnalyticOn.fderiv [CompleteSpace F] (h : AnalyticOn 𝕜 f s) : AnalyticOn 𝕜 (fderiv 𝕜 f) s := by
intro y hy rcases h y hy with ⟨p, r, hp⟩ exact hp.fderiv.analyticAt
import Mathlib.Data.Set.Image import Mathlib.Data.SProd #align_import data.set.prod from "leanprover-community/mathlib"@"48fb5b5280e7c81672afc9524185ae994553ebf4" open Function namespace Set section Prod variable {α β γ δ : Type*} {s s₁ s₂ : Set α} {t t₁ t₂ : Set β} {a : α} {b : β} theorem Subsingleton.pro...
Mathlib/Data/Set/Prod.lean
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theorem mk_preimage_prod_left (hb : b ∈ t) : (fun a => (a, b)) ⁻¹' s ×ˢ t = s := by
ext a simp [hb]
import Mathlib.Data.Finset.Pointwise import Mathlib.Data.Fintype.BigOperators import Mathlib.Data.DFinsupp.Order import Mathlib.Order.Interval.Finset.Basic #align_import data.dfinsupp.interval from "leanprover-community/mathlib"@"1d29de43a5ba4662dd33b5cfeecfc2a27a5a8a29" open DFinsupp Finset open Pointwise vari...
Mathlib/Data/DFinsupp/Interval.lean
64
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theorem mem_dfinsupp_iff_of_support_subset {t : Π₀ i, Finset (α i)} (ht : t.support ⊆ s) : f ∈ s.dfinsupp t ↔ ∀ i, f i ∈ t i := by
refine mem_dfinsupp_iff.trans (forall_and.symm.trans <| forall_congr' fun i => ⟨ fun h => ?_, fun h => ⟨fun hi => ht <| mem_support_iff.2 fun H => mem_support_iff.1 hi ?_, fun _ => h⟩⟩) · by_cases hi : i ∈ s · exact h.2 hi · rw [not_mem_support_iff.1 (mt h.1 hi), not_mem_support_iff.1 (not_me...
import Mathlib.Algebra.Associated import Mathlib.Algebra.BigOperators.Group.Finset import Mathlib.Algebra.SMulWithZero import Mathlib.Data.Nat.PartENat import Mathlib.Tactic.Linarith #align_import ring_theory.multiplicity from "leanprover-community/mathlib"@"e8638a0fcaf73e4500469f368ef9494e495099b3" variable {α β...
Mathlib/RingTheory/Multiplicity.lean
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theorem get_one_right {a : α} (ha : Finite a 1) : get (multiplicity a 1) ha = 0 := by
rw [PartENat.get_eq_iff_eq_coe, eq_coe_iff, _root_.pow_zero] simp [not_dvd_one_of_finite_one_right ha]
import Mathlib.CategoryTheory.Subobject.Limits #align_import algebra.homology.image_to_kernel from "leanprover-community/mathlib"@"618ea3d5c99240cd7000d8376924906a148bf9ff" universe v u w open CategoryTheory CategoryTheory.Limits variable {ι : Type*} variable {V : Type u} [Category.{v} V] [HasZeroMorphisms V] o...
Mathlib/Algebra/Homology/ImageToKernel.lean
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theorem imageToKernel_arrow (w : f ≫ g = 0) : imageToKernel f g w ≫ (kernelSubobject g).arrow = (imageSubobject f).arrow := by
simp [imageToKernel]
import Mathlib.LinearAlgebra.Dimension.StrongRankCondition import Mathlib.LinearAlgebra.FreeModule.Basic #align_import linear_algebra.free_module.pid from "leanprover-community/mathlib"@"d87199d51218d36a0a42c66c82d147b5a7ff87b3" universe u v section IsDomain variable {ι : Type*} {R : Type*} [CommRing R] [IsDoma...
Mathlib/LinearAlgebra/FreeModule/PID.lean
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theorem dvd_generator_iff {I : Ideal R} [I.IsPrincipal] {x : R} (hx : x ∈ I) : x ∣ generator I ↔ I = Ideal.span {x} := by
conv_rhs => rw [← span_singleton_generator I] rw [Ideal.submodule_span_eq, Ideal.span_singleton_eq_span_singleton, ← dvd_dvd_iff_associated, ← mem_iff_generator_dvd] exact ⟨fun h ↦ ⟨hx, h⟩, fun h ↦ h.2⟩
import Mathlib.LinearAlgebra.CliffordAlgebra.Conjugation #align_import linear_algebra.clifford_algebra.fold from "leanprover-community/mathlib"@"446eb51ce0a90f8385f260d2b52e760e2004246b" universe u1 u2 u3 variable {R M N : Type*} variable [CommRing R] [AddCommGroup M] [AddCommGroup N] variable [Module R M] [Modu...
Mathlib/LinearAlgebra/CliffordAlgebra/Fold.lean
161
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theorem left_induction {P : CliffordAlgebra Q → Prop} (algebraMap : ∀ r : R, P (algebraMap _ _ r)) (add : ∀ x y, P x → P y → P (x + y)) (ι_mul : ∀ x m, P x → P (ι Q m * x)) : ∀ x, P x := by
refine reverse_involutive.surjective.forall.2 ?_ intro x induction' x using CliffordAlgebra.right_induction with r x y hx hy m x hx · simpa only [reverse.commutes] using algebraMap r · simpa only [map_add] using add _ _ hx hy · simpa only [reverse.map_mul, reverse_ι] using ι_mul _ _ hx
import Mathlib.Data.Sym.Sym2 import Mathlib.Logic.Relation #align_import order.game_add from "leanprover-community/mathlib"@"fee218fb033b2fd390c447f8be27754bc9093be9" set_option autoImplicit true variable {α β : Type*} {rα : α → α → Prop} {rβ : β → β → Prop} namespace Prod variable (rα rβ) inductive Game...
Mathlib/Order/GameAdd.lean
60
67
theorem gameAdd_iff {rα rβ} {x y : α × β} : GameAdd rα rβ x y ↔ rα x.1 y.1 ∧ x.2 = y.2 ∨ rβ x.2 y.2 ∧ x.1 = y.1 := by
constructor · rintro (@⟨a₁, a₂, b, h⟩ | @⟨a, b₁, b₂, h⟩) exacts [Or.inl ⟨h, rfl⟩, Or.inr ⟨h, rfl⟩] · revert x y rintro ⟨a₁, b₁⟩ ⟨a₂, b₂⟩ (⟨h, rfl : b₁ = b₂⟩ | ⟨h, rfl : a₁ = a₂⟩) exacts [GameAdd.fst h, GameAdd.snd h]
import Mathlib.Topology.ContinuousFunction.Bounded import Mathlib.Topology.UniformSpace.Compact import Mathlib.Topology.CompactOpen import Mathlib.Topology.Sets.Compacts import Mathlib.Analysis.Normed.Group.InfiniteSum #align_import topology.continuous_function.compact from "leanprover-community/mathlib"@"d3af0609f6d...
Mathlib/Topology/ContinuousFunction/Compact.lean
132
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theorem dist_apply_le_dist (x : α) : dist (f x) (g x) ≤ dist f g := by
simp only [← dist_mkOfCompact, dist_coe_le_dist, ← mkOfCompact_apply]
import Mathlib.Combinatorics.SimpleGraph.Basic import Mathlib.Combinatorics.SimpleGraph.Connectivity import Mathlib.LinearAlgebra.Matrix.Trace import Mathlib.LinearAlgebra.Matrix.Symmetric #align_import combinatorics.simple_graph.adj_matrix from "leanprover-community/mathlib"@"3e068ece210655b7b9a9477c3aff38a492400aa1...
Mathlib/Combinatorics/SimpleGraph/AdjMatrix.lean
115
117
theorem isSymm_compl [Zero α] [One α] (h : A.IsSymm) : A.compl.IsSymm := by
ext simp [compl, h.apply, eq_comm]
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
101
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theorem graph_injective (α M) [Zero M] : Injective (@graph α M _) := by
intro f g h classical have hsup : f.support = g.support := by rw [← image_fst_graph, h, image_fst_graph] refine ext_iff'.2 ⟨hsup, fun x hx => apply_eq_of_mem_graph <| h.symm ▸ ?_⟩ exact mk_mem_graph _ (hsup ▸ hx)
import Mathlib.Algebra.Homology.Homotopy import Mathlib.Algebra.Category.ModuleCat.Abelian import Mathlib.Algebra.Category.ModuleCat.Subobject import Mathlib.CategoryTheory.Limits.Shapes.ConcreteCategory #align_import algebra.homology.Module from "leanprover-community/mathlib"@"70fd9563a21e7b963887c9360bd29b2393e6225...
Mathlib/Algebra/Homology/ModuleCat.lean
61
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theorem cycles'_ext {C : HomologicalComplex (ModuleCat.{u} R) c} {i : ι} {x y : (C.cycles' i : Type u)} (w : (C.cycles' i).arrow x = (C.cycles' i).arrow y) : x = y := by
apply_fun (C.cycles' i).arrow using (ModuleCat.mono_iff_injective _).mp (cycles' C i).arrow_mono exact w
import Mathlib.Algebra.BigOperators.Fin import Mathlib.LinearAlgebra.Finsupp import Mathlib.LinearAlgebra.Prod import Mathlib.SetTheory.Cardinal.Basic import Mathlib.Tactic.FinCases import Mathlib.Tactic.LinearCombination import Mathlib.Lean.Expr.ExtraRecognizers import Mathlib.Data.Set.Subsingleton #align_import lin...
Mathlib/LinearAlgebra/LinearIndependent.lean
472
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theorem linearIndependent_comp_subtype_disjoint {s : Set ι} : LinearIndependent R (v ∘ (↑) : s → M) ↔ Disjoint (Finsupp.supported R R s) (LinearMap.ker <| Finsupp.total ι M R v) := by
rw [linearIndependent_comp_subtype, LinearMap.disjoint_ker]
import Mathlib.Topology.ContinuousFunction.Bounded import Mathlib.Topology.UniformSpace.Compact import Mathlib.Topology.CompactOpen import Mathlib.Topology.Sets.Compacts import Mathlib.Analysis.Normed.Group.InfiniteSum #align_import topology.continuous_function.compact from "leanprover-community/mathlib"@"d3af0609f6d...
Mathlib/Topology/ContinuousFunction/Compact.lean
154
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theorem dist_lt_iff (C0 : (0 : ℝ) < C) : dist f g < C ↔ ∀ x : α, dist (f x) (g x) < C := by
rw [← dist_mkOfCompact, dist_lt_iff_of_compact C0] simp only [mkOfCompact_apply]
import Mathlib.RingTheory.Ideal.Cotangent import Mathlib.RingTheory.DedekindDomain.Basic import Mathlib.RingTheory.Valuation.ValuationRing import Mathlib.RingTheory.Nakayama #align_import ring_theory.discrete_valuation_ring.tfae from "leanprover-community/mathlib"@"f0c8bf9245297a541f468be517f1bde6195105e9" variab...
Mathlib/RingTheory/DiscreteValuationRing/TFAE.lean
166
205
theorem tfae_of_isNoetherianRing_of_localRing_of_isDomain [IsNoetherianRing R] [LocalRing R] [IsDomain R] : List.TFAE [IsPrincipalIdealRing R, ValuationRing R, IsDedekindDomain R, IsIntegrallyClosed R ∧ ∀ P : Ideal R, P ≠ ⊥ → P.IsPrime → P = maximalIdeal R, (maximalIdeal R).IsPrincipal, ...
tfae_have 1 → 2 · exact fun _ ↦ inferInstance tfae_have 2 → 1 · exact fun _ ↦ ((IsBezout.TFAE (R := R)).out 0 1).mp ‹_› tfae_have 1 → 4 · intro H exact ⟨inferInstance, fun P hP hP' ↦ eq_maximalIdeal (hP'.isMaximal hP)⟩ tfae_have 4 → 3 · exact fun ⟨h₁, h₂⟩ ↦ { h₁ with maximalOfPrime := (h₂ _ · · ▸ m...
import Mathlib.Analysis.Seminorm import Mathlib.Topology.Algebra.Equicontinuity import Mathlib.Topology.MetricSpace.Equicontinuity import Mathlib.Topology.Algebra.FilterBasis import Mathlib.Topology.Algebra.Module.LocallyConvex #align_import analysis.locally_convex.with_seminorms from "leanprover-community/mathlib"@"...
Mathlib/Analysis/LocallyConvex/WithSeminorms.lean
92
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theorem basisSets_nonempty [Nonempty ι] : p.basisSets.Nonempty := by
let i := Classical.arbitrary ι refine nonempty_def.mpr ⟨(p i).ball 0 1, ?_⟩ exact p.basisSets_singleton_mem i zero_lt_one
import Mathlib.Analysis.Calculus.FDeriv.Add import Mathlib.Analysis.Calculus.FDeriv.Equiv import Mathlib.Analysis.Calculus.FDeriv.Prod import Mathlib.Analysis.Calculus.Monotone import Mathlib.Data.Set.Function import Mathlib.Algebra.Group.Basic import Mathlib.Tactic.WLOG #align_import analysis.bounded_variation from ...
Mathlib/Analysis/BoundedVariation.lean
225
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theorem _root_.BoundedVariationOn.dist_le {E : Type*} [PseudoMetricSpace E] {f : α → E} {s : Set α} (h : BoundedVariationOn f s) {x y : α} (hx : x ∈ s) (hy : y ∈ s) : dist (f x) (f y) ≤ (eVariationOn f s).toReal := by
rw [← ENNReal.ofReal_le_ofReal_iff ENNReal.toReal_nonneg, ENNReal.ofReal_toReal h, ← edist_dist] exact edist_le f hx hy
import Mathlib.Analysis.Convex.Basic import Mathlib.Analysis.InnerProductSpace.Orthogonal import Mathlib.Analysis.InnerProductSpace.Symmetric import Mathlib.Analysis.NormedSpace.RCLike import Mathlib.Analysis.RCLike.Lemmas import Mathlib.Algebra.DirectSum.Decomposition #align_import analysis.inner_product_space.proje...
Mathlib/Analysis/InnerProductSpace/Projection.lean
333
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theorem norm_eq_iInf_iff_inner_eq_zero {u : E} {v : E} (hv : v ∈ K) : (‖u - v‖ = ⨅ w : K, ‖u - w‖) ↔ ∀ w ∈ K, ⟪u - v, w⟫ = 0 := by
letI : InnerProductSpace ℝ E := InnerProductSpace.rclikeToReal 𝕜 E letI : Module ℝ E := RestrictScalars.module ℝ 𝕜 E let K' : Submodule ℝ E := K.restrictScalars ℝ constructor · intro H have A : ∀ w ∈ K, re ⟪u - v, w⟫ = 0 := (norm_eq_iInf_iff_real_inner_eq_zero K' hv).1 H intro w hw apply ext ...
import Mathlib.Logic.Encodable.Lattice import Mathlib.MeasureTheory.MeasurableSpace.Defs #align_import measure_theory.pi_system from "leanprover-community/mathlib"@"98e83c3d541c77cdb7da20d79611a780ff8e7d90" open MeasurableSpace Set open scoped Classical open MeasureTheory def IsPiSystem {α} (C : Set (Set α)) :...
Mathlib/MeasureTheory/PiSystem.lean
502
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theorem measurableSet_iSup_of_mem_piiUnionInter (m : ι → MeasurableSpace α) (S : Set ι) (t : Set α) (ht : t ∈ piiUnionInter (fun n => { s | MeasurableSet[m n] s }) S) : MeasurableSet[⨆ i ∈ S, m i] t := by
rcases ht with ⟨pt, hpt, ft, ht_m, rfl⟩ refine pt.measurableSet_biInter fun i hi => ?_ suffices h_le : m i ≤ ⨆ i ∈ S, m i from h_le (ft i) (ht_m i hi) have hi' : i ∈ S := hpt hi exact le_iSup₂ (f := fun i (_ : i ∈ S) => m i) i hi'
import Mathlib.LinearAlgebra.Quotient import Mathlib.LinearAlgebra.Prod #align_import linear_algebra.projection from "leanprover-community/mathlib"@"6d584f1709bedbed9175bd9350df46599bdd7213" noncomputable section Ring variable {R : Type*} [Ring R] {E : Type*} [AddCommGroup E] [Module R E] variable {F : Type*} [Ad...
Mathlib/LinearAlgebra/Projection.lean
396
410
theorem isProj_iff_idempotent (f : M →ₗ[S] M) : (∃ p : Submodule S M, IsProj p f) ↔ f ∘ₗ f = f := by
constructor · intro h obtain ⟨p, hp⟩ := h ext x rw [comp_apply] exact hp.map_id (f x) (hp.map_mem x) · intro h use range f constructor · intro x exact mem_range_self f x · intro x hx obtain ⟨y, hy⟩ := mem_range.1 hx rw [← hy, ← comp_apply, h]
import Mathlib.Algebra.Group.Commute.Basic import Mathlib.Data.Fintype.Card import Mathlib.GroupTheory.Perm.Basic #align_import group_theory.perm.support from "leanprover-community/mathlib"@"9003f28797c0664a49e4179487267c494477d853" open Equiv Finset namespace Equiv.Perm variable {α : Type*} section support v...
Mathlib/GroupTheory/Perm/Support.lean
324
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theorem support_congr (h : f.support ⊆ g.support) (h' : ∀ x ∈ g.support, f x = g x) : f = g := by
ext x by_cases hx : x ∈ g.support · exact h' x hx · rw [not_mem_support.mp hx, ← not_mem_support] exact fun H => hx (h H)
import Mathlib.CategoryTheory.Monad.Types import Mathlib.CategoryTheory.Monad.Limits import Mathlib.CategoryTheory.Equivalence import Mathlib.Topology.Category.CompHaus.Basic import Mathlib.Topology.Category.Profinite.Basic import Mathlib.Data.Set.Constructions #align_import topology.category.Compactum from "leanprov...
Mathlib/Topology/Category/Compactum.lean
158
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theorem join_distrib (X : Compactum) (uux : Ultrafilter (Ultrafilter X)) : X.str (X.join uux) = X.str (map X.str uux) := by
change ((β ).μ.app _ ≫ X.a) _ = _ rw [Monad.Algebra.assoc] rfl
import Mathlib.Data.Matrix.Basic import Mathlib.LinearAlgebra.Matrix.Trace #align_import data.matrix.basis from "leanprover-community/mathlib"@"320df450e9abeb5fc6417971e75acb6ae8bc3794" variable {l m n : Type*} variable {R α : Type*} namespace Matrix open Matrix variable [DecidableEq l] [DecidableEq m] [Decida...
Mathlib/Data/Matrix/Basis.lean
65
79
theorem matrix_eq_sum_std_basis [Fintype m] [Fintype n] (x : Matrix m n α) : x = ∑ i : m, ∑ j : n, stdBasisMatrix i j (x i j) := by
ext i j; symm iterate 2 rw [Finset.sum_apply] -- Porting note: was `convert` refine (Fintype.sum_eq_single i ?_).trans ?_; swap · -- Porting note: `simp` seems unwilling to apply `Fintype.sum_apply` simp (config := { unfoldPartialApp := true }) only [stdBasisMatrix] rw [Fintype.sum_apply, Fintype.sum...
import Mathlib.RingTheory.GradedAlgebra.HomogeneousIdeal import Mathlib.Topology.Category.TopCat.Basic import Mathlib.Topology.Sets.Opens import Mathlib.Data.Set.Subsingleton #align_import algebraic_geometry.projective_spectrum.topology from "leanprover-community/mathlib"@"d39590fc8728fbf6743249802486f8c91ffe07bc" ...
Mathlib/AlgebraicGeometry/ProjectiveSpectrum/Topology.lean
210
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theorem vanishingIdeal_univ : vanishingIdeal (∅ : Set (ProjectiveSpectrum 𝒜)) = ⊤ := by
simpa using (gc_ideal _).u_top
import Mathlib.CategoryTheory.Limits.Shapes.BinaryProducts import Mathlib.CategoryTheory.Limits.Preserves.Basic #align_import category_theory.limits.preserves.shapes.binary_products from "leanprover-community/mathlib"@"024a4231815538ac739f52d08dd20a55da0d6b23" noncomputable section universe v₁ v₂ u₁ u₂ open Cat...
Mathlib/CategoryTheory/Limits/Preserves/Shapes/BinaryProducts.lean
106
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theorem PreservesLimitPair.iso_inv_snd : (PreservesLimitPair.iso G X Y).inv ≫ G.map prod.snd = prod.snd := by
rw [← Iso.cancel_iso_hom_left (PreservesLimitPair.iso G X Y), ← Category.assoc, Iso.hom_inv_id] simp
import Mathlib.Data.SetLike.Basic import Mathlib.Data.Finset.Preimage import Mathlib.ModelTheory.Semantics #align_import model_theory.definability from "leanprover-community/mathlib"@"70fd9563a21e7b963887c9360bd29b2393e6225a" universe u v w u₁ namespace Set variable {M : Type w} (A : Set M) (L : FirstOrder.Lang...
Mathlib/ModelTheory/Definability.lean
106
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theorem Definable.inter {f g : Set (α → M)} (hf : A.Definable L f) (hg : A.Definable L g) : A.Definable L (f ∩ g) := by
rcases hf with ⟨φ, rfl⟩ rcases hg with ⟨θ, rfl⟩ refine ⟨φ ⊓ θ, ?_⟩ ext simp
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
118
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theorem sum_mongePointWeightsWithCircumcenter (n : ℕ) : ∑ i, mongePointWeightsWithCircumcenter n i = 1 := by
simp_rw [sum_pointsWithCircumcenter, mongePointWeightsWithCircumcenter, sum_const, card_fin, nsmul_eq_mul] -- Porting note: replaced -- have hn1 : (n + 1 : ℝ) ≠ 0 := mod_cast Nat.succ_ne_zero _ field_simp [n.cast_add_one_ne_zero] ring
import Mathlib.Order.UpperLower.Basic import Mathlib.Data.Finset.Preimage #align_import combinatorics.young.young_diagram from "leanprover-community/mathlib"@"59694bd07f0a39c5beccba34bd9f413a160782bf" open Function @[ext] structure YoungDiagram where cells : Finset (ℕ × ℕ) isLowerSet : IsLowerSet (cel...
Mathlib/Combinatorics/Young/YoungDiagram.lean
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theorem row_eq_prod {μ : YoungDiagram} {i : ℕ} : μ.row i = {i} ×ˢ Finset.range (μ.rowLen i) := by
ext ⟨a, b⟩ simp only [Finset.mem_product, Finset.mem_singleton, Finset.mem_range, mem_row_iff, mem_iff_lt_rowLen, and_comm, and_congr_right_iff] rintro rfl rfl
import Mathlib.Algebra.BigOperators.Finsupp import Mathlib.Algebra.BigOperators.Finprod import Mathlib.Data.Fintype.BigOperators import Mathlib.LinearAlgebra.Finsupp import Mathlib.LinearAlgebra.LinearIndependent import Mathlib.SetTheory.Cardinal.Cofinality #align_import linear_algebra.basis from "leanprover-communit...
Mathlib/LinearAlgebra/Basis.lean
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theorem total_repr : Finsupp.total _ _ _ b (b.repr x) = x := by
rw [← b.coe_repr_symm] exact b.repr.symm_apply_apply x
import Mathlib.Algebra.BigOperators.Group.List import Mathlib.Algebra.Group.Prod import Mathlib.Data.Multiset.Basic #align_import algebra.big_operators.multiset.basic from "leanprover-community/mathlib"@"6c5f73fd6f6cc83122788a80a27cdd54663609f4" assert_not_exists MonoidWithZero variable {F ι α β γ : Type*} names...
Mathlib/Algebra/BigOperators/Group/Multiset.lean
136
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theorem prod_map_eq_pow_single [DecidableEq ι] (i : ι) (hf : ∀ i' ≠ i, i' ∈ m → f i' = 1) : (m.map f).prod = f i ^ m.count i := by
induction' m using Quotient.inductionOn with l simp [List.prod_map_eq_pow_single i f hf]
import Mathlib.SetTheory.Cardinal.Ordinal import Mathlib.SetTheory.Ordinal.FixedPoint #align_import set_theory.cardinal.cofinality from "leanprover-community/mathlib"@"7c2ce0c2da15516b4e65d0c9e254bb6dc93abd1f" noncomputable section open Function Cardinal Set Order open scoped Classical open Cardinal Ordinal un...
Mathlib/SetTheory/Cardinal/Cofinality.lean
80
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theorem le_cof {r : α → α → Prop} [IsRefl α r] (c : Cardinal) : c ≤ cof r ↔ ∀ {S : Set α}, (∀ a, ∃ b ∈ S, r a b) → c ≤ #S := by
rw [cof, le_csInf_iff'' (cof_nonempty r)] use fun H S h => H _ ⟨S, h, rfl⟩ rintro H d ⟨S, h, rfl⟩ exact H h
import Mathlib.Algebra.BigOperators.Ring import Mathlib.Data.Fintype.Basic import Mathlib.Data.Int.GCD import Mathlib.RingTheory.Coprime.Basic #align_import ring_theory.coprime.lemmas from "leanprover-community/mathlib"@"509de852e1de55e1efa8eacfa11df0823f26f226" universe u v section IsCoprime variable {R : Type ...
Mathlib/RingTheory/Coprime/Lemmas.lean
94
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theorem Finset.prod_dvd_of_coprime : (t : Set I).Pairwise (IsCoprime on s) → (∀ i ∈ t, s i ∣ z) → (∏ x ∈ t, s x) ∣ z := by
classical exact Finset.induction_on t (fun _ _ ↦ one_dvd z) (by intro a r har ih Hs Hs1 rw [Finset.prod_insert har] have aux1 : a ∈ (↑(insert a r) : Set I) := Finset.mem_insert_self a r refine (IsCoprime.prod_right fun i hir ↦ Hs aux1 (Finset.mem_insert_of_mem hir)...
import Mathlib.Topology.MetricSpace.HausdorffDistance #align_import topology.metric_space.pi_nat from "leanprover-community/mathlib"@"49b7f94aab3a3bdca1f9f34c5d818afb253b3993" noncomputable section open scoped Classical open Topology Filter open TopologicalSpace Set Metric Filter Function attribute [local simp...
Mathlib/Topology/MetricSpace/PiNat.lean
274
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theorem dist_eq_of_ne {x y : ∀ n, E n} (h : x ≠ y) : dist x y = (1 / 2 : ℝ) ^ firstDiff x y := by
simp [dist, h]
import Mathlib.Analysis.SpecialFunctions.Pow.Real #align_import analysis.special_functions.pow.nnreal from "leanprover-community/mathlib"@"4fa54b337f7d52805480306db1b1439c741848c8" noncomputable section open scoped Classical open Real NNReal ENNReal ComplexConjugate open Finset Function Set namespace NNReal var...
Mathlib/Analysis/SpecialFunctions/Pow/NNReal.lean
325
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theorem eq_rpow_one_div_iff {x y : ℝ≥0} {z : ℝ} (hz : z ≠ 0) : x = y ^ (1 / z) ↔ x ^ z = y := by
rw [← rpow_eq_rpow_iff hz, rpow_self_rpow_inv hz]
import Mathlib.CategoryTheory.Closed.Cartesian import Mathlib.CategoryTheory.Limits.Preserves.Shapes.BinaryProducts import Mathlib.CategoryTheory.Adjunction.FullyFaithful #align_import category_theory.closed.functor from "leanprover-community/mathlib"@"cea27692b3fdeb328a2ddba6aabf181754543184" noncomputable secti...
Mathlib/CategoryTheory/Closed/Functor.lean
128
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theorem frobeniusMorphism_mate (h : L ⊣ F) (A : C) : transferNatTransSelf (h.comp (exp.adjunction A)) ((exp.adjunction (F.obj A)).comp h) (frobeniusMorphism F h A) = expComparison F A := by
rw [← Equiv.eq_symm_apply] ext B : 2 dsimp [frobeniusMorphism, transferNatTransSelf, transferNatTrans, Adjunction.comp] simp only [id_comp, comp_id] rw [← L.map_comp_assoc, prod.map_id_comp, assoc] -- Porting note: need to use `erw` here. -- https://github.com/leanprover-community/mathlib4/issues/5164 ...
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 flip_v : (flip u).v = u.v.swap := by
dsimp [v] ext · simp only ring · simp only ring
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
708
708
theorem frontier_empty : frontier (∅ : Set X) = ∅ := by
simp [frontier]
import Mathlib.RingTheory.Ideal.Maps #align_import ring_theory.ideal.prod from "leanprover-community/mathlib"@"052f6013363326d50cb99c6939814a4b8eb7b301" universe u v variable {R : Type u} {S : Type v} [Semiring R] [Semiring S] (I I' : Ideal R) (J J' : Ideal S) namespace Ideal def prod : Ideal (R × S) where ...
Mathlib/RingTheory/Ideal/Prod.lean
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theorem isPrime_of_isPrime_prod_top {I : Ideal R} (h : (Ideal.prod I (⊤ : Ideal S)).IsPrime) : I.IsPrime := by
constructor · contrapose! h rw [h, prod_top_top, isPrime_iff] simp [isPrime_iff, h] · intro x y hxy have : (⟨x, 1⟩ : R × S) * ⟨y, 1⟩ ∈ prod I ⊤ := by rw [Prod.mk_mul_mk, mul_one, mem_prod] exact ⟨hxy, trivial⟩ simpa using h.mem_or_mem this
import Mathlib.Data.Int.Bitwise import Mathlib.LinearAlgebra.Matrix.NonsingularInverse import Mathlib.LinearAlgebra.Matrix.Symmetric #align_import linear_algebra.matrix.zpow from "leanprover-community/mathlib"@"03fda9112aa6708947da13944a19310684bfdfcb" open Matrix namespace Matrix variable {n' : Type*} [Decidab...
Mathlib/LinearAlgebra/Matrix/ZPow.lean
57
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theorem pow_inv_comm' (A : M) (m n : ℕ) : A⁻¹ ^ m * A ^ n = A ^ n * A⁻¹ ^ m := by
induction' n with n IH generalizing m · simp cases' m with m m · simp rcases nonsing_inv_cancel_or_zero A with (⟨h, h'⟩ | h) · calc A⁻¹ ^ (m + 1) * A ^ (n + 1) = A⁻¹ ^ m * (A⁻¹ * A) * A ^ n := by simp only [pow_succ A⁻¹, pow_succ' A, Matrix.mul_assoc] _ = A ^ n * A⁻¹ ^ m := by simp onl...
import Mathlib.Analysis.BoxIntegral.Partition.Filter import Mathlib.Analysis.BoxIntegral.Partition.Measure import Mathlib.Topology.UniformSpace.Compact import Mathlib.Init.Data.Bool.Lemmas #align_import analysis.box_integral.basic from "leanprover-community/mathlib"@"f2ce6086713c78a7f880485f7917ea547a215982" open...
Mathlib/Analysis/BoxIntegral/Basic.lean
646
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theorem sum_integral_congr (h : Integrable I l f vol) {π₁ π₂ : Prepartition I} (hU : π₁.iUnion = π₂.iUnion) : ∑ J ∈ π₁.boxes, integral J l f vol = ∑ J ∈ π₂.boxes, integral J l f vol := by
refine tendsto_nhds_unique (h.tendsto_integralSum_sum_integral π₁) ?_ rw [l.toFilteriUnion_congr _ hU] exact h.tendsto_integralSum_sum_integral π₂
import Mathlib.Analysis.NormedSpace.Star.ContinuousFunctionalCalculus.Restrict import Mathlib.Analysis.NormedSpace.Star.ContinuousFunctionalCalculus import Mathlib.Analysis.NormedSpace.Star.Spectrum import Mathlib.Analysis.NormedSpace.Star.Unitization import Mathlib.Topology.ContinuousFunction.UniqueCFC noncomputab...
Mathlib/Analysis/NormedSpace/Star/ContinuousFunctionalCalculus/Instances.lean
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theorem RCLike.nonUnitalContinuousFunctionalCalculus : NonUnitalContinuousFunctionalCalculus 𝕜 (p : A → Prop) where exists_cfc_of_predicate a ha := by
let ψ : C(σₙ 𝕜 a, 𝕜)₀ →⋆ₙₐ[𝕜] A := comp (inrRangeEquiv 𝕜 A).symm <| codRestrict (cfcₙAux hp₁ a ha) _ (cfcₙAux_mem_range_inr hp₁ a ha) have coe_ψ (f : C(σₙ 𝕜 a, 𝕜)₀) : ψ f = cfcₙAux hp₁ a ha f := congr_arg Subtype.val <| (inrRangeEquiv 𝕜 A).apply_symm_apply ⟨cfcₙAux hp₁ a ha f, cfcₙAu...
import Mathlib.Data.Nat.Bits import Mathlib.Order.Lattice #align_import data.nat.size from "leanprover-community/mathlib"@"18a5306c091183ac90884daa9373fa3b178e8607" namespace Nat section set_option linter.deprecated false theorem shiftLeft_eq_mul_pow (m) : ∀ n, m <<< n = m * 2 ^ n := shiftLeft_eq _ #align nat....
Mathlib/Data/Nat/Size.lean
141
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theorem size_pos {n : ℕ} : 0 < size n ↔ 0 < n := by
rw [lt_size]; rfl
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
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theorem iUnion_coe_splitCenterBox (I : Box ι) : ⋃ s, (I.splitCenterBox s : Set (ι → ℝ)) = I := by
ext x simp
import Mathlib.Analysis.InnerProductSpace.Projection import Mathlib.Geometry.Euclidean.PerpBisector import Mathlib.Algebra.QuadraticDiscriminant #align_import geometry.euclidean.basic from "leanprover-community/mathlib"@"2de9c37fa71dde2f1c6feff19876dd6a7b1519f0" noncomputable section open scoped Classical open ...
Mathlib/Geometry/Euclidean/Basic.lean
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theorem reflection_eq_iff_orthogonalProjection_eq (s₁ s₂ : AffineSubspace ℝ P) [Nonempty s₁] [Nonempty s₂] [HasOrthogonalProjection s₁.direction] [HasOrthogonalProjection s₂.direction] (p : P) : reflection s₁ p = reflection s₂ p ↔ (orthogonalProjection s₁ p : P) = orthogonalProjection s₂ p := by
rw [reflection_apply, reflection_apply] constructor · intro h rw [← @vsub_eq_zero_iff_eq V, vsub_vadd_eq_vsub_sub, vadd_vsub_assoc, add_comm, add_sub_assoc, vsub_sub_vsub_cancel_right, ← two_smul ℝ ((orthogonalProjection s₁ p : P) -ᵥ orthogonalProjection s₂ p), smul_eq_zero] at h norm_num at ...
import Mathlib.Order.BoundedOrder import Mathlib.Order.MinMax import Mathlib.Algebra.NeZero import Mathlib.Algebra.Order.Monoid.Defs #align_import algebra.order.monoid.canonical.defs from "leanprover-community/mathlib"@"e8638a0fcaf73e4500469f368ef9494e495099b3" universe u variable {α : Type u} class ExistsMulOf...
Mathlib/Algebra/Order/Monoid/Canonical/Defs.lean
257
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theorem le_mul_left (h : a ≤ c) : a ≤ b * c := calc a = 1 * a := by
simp _ ≤ b * c := mul_le_mul' (one_le _) h
import Mathlib.Order.Filter.Bases import Mathlib.Order.ConditionallyCompleteLattice.Basic #align_import order.filter.lift from "leanprover-community/mathlib"@"8631e2d5ea77f6c13054d9151d82b83069680cb1" open Set Classical Filter Function namespace Filter variable {α β γ : Type*} {ι : Sort*} section lift protect...
Mathlib/Order/Filter/Lift.lean
78
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theorem sInter_lift_sets (hg : Monotone g) : ⋂₀ { s | s ∈ f.lift g } = ⋂ s ∈ f, ⋂₀ { t | t ∈ g s } := by
simp only [sInter_eq_biInter, mem_setOf_eq, Filter.mem_sets, mem_lift_sets hg, iInter_exists, iInter_and, @iInter_comm _ (Set β)]
import Mathlib.Order.Interval.Set.Monotone import Mathlib.Topology.MetricSpace.Basic import Mathlib.Topology.MetricSpace.Bounded import Mathlib.Topology.Order.MonotoneConvergence #align_import analysis.box_integral.box.basic from "leanprover-community/mathlib"@"f2ce6086713c78a7f880485f7917ea547a215982" open Set Fu...
Mathlib/Analysis/BoxIntegral/Box/Basic.lean
518
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theorem nndist_le_distortion_mul (I : Box ι) (i : ι) : nndist I.lower I.upper ≤ I.distortion * nndist (I.lower i) (I.upper i) := calc nndist I.lower I.upper = nndist I.lower I.upper / nndist (I.lower i) (I.upper i) * nndist (I.lower i) (I.upper i) := (div_mul_cancel₀ _ <| mt nndist_eq_zero.1 (I....
apply mul_le_mul_right' apply Finset.le_sup (Finset.mem_univ i)
import Mathlib.Analysis.InnerProductSpace.PiL2 import Mathlib.LinearAlgebra.Matrix.Block #align_import analysis.inner_product_space.gram_schmidt_ortho from "leanprover-community/mathlib"@"1a4df69ca1a9a0e5e26bfe12e2b92814216016d0" open Finset Submodule FiniteDimensional variable (𝕜 : Type*) {E : Type*} [RCLike �...
Mathlib/Analysis/InnerProductSpace/GramSchmidtOrtho.lean
380
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theorem gramSchmidtOrthonormalBasis_inv_triangular' {i j : ι} (hij : i < j) : (gramSchmidtOrthonormalBasis h f).repr (f i) j = 0 := by
simpa [OrthonormalBasis.repr_apply_apply] using gramSchmidtOrthonormalBasis_inv_triangular h f hij
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
455
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theorem sigma_eq_iff_blocks_eq {c : Σn, Composition n} {c' : Σn, Composition n} : c = c' ↔ c.2.blocks = c'.2.blocks := by
refine ⟨fun H => by rw [H], fun H => ?_⟩ rcases c with ⟨n, c⟩ rcases c' with ⟨n', c'⟩ have : n = n' := by rw [← c.blocks_sum, ← c'.blocks_sum, H] induction this congr ext1 exact H
import Mathlib.Analysis.InnerProductSpace.TwoDim import Mathlib.Geometry.Euclidean.Angle.Unoriented.Basic #align_import geometry.euclidean.angle.oriented.basic from "leanprover-community/mathlib"@"f0c8bf9245297a541f468be517f1bde6195105e9" noncomputable section open FiniteDimensional Complex open scoped Real Rea...
Mathlib/Geometry/Euclidean/Angle/Oriented/Basic.lean
471
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theorem oangle_ne_zero_and_ne_pi_iff_linearIndependent {x y : V} : o.oangle x y ≠ 0 ∧ o.oangle x y ≠ π ↔ LinearIndependent ℝ ![x, y] := by
rw [← not_or, ← not_iff_not, Classical.not_not, oangle_eq_zero_or_eq_pi_iff_not_linearIndependent]
import Mathlib.GroupTheory.GroupAction.Pointwise import Mathlib.Analysis.LocallyConvex.Basic import Mathlib.Analysis.LocallyConvex.BalancedCoreHull import Mathlib.Analysis.Seminorm import Mathlib.Topology.Bornology.Basic import Mathlib.Topology.Algebra.UniformGroup import Mathlib.Topology.UniformSpace.Cauchy import Ma...
Mathlib/Analysis/LocallyConvex/Bounded.lean
80
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theorem _root_.Filter.HasBasis.isVonNBounded_iff {q : ι → Prop} {s : ι → Set E} {A : Set E} (h : (𝓝 (0 : E)).HasBasis q s) : IsVonNBounded 𝕜 A ↔ ∀ i, q i → Absorbs 𝕜 (s i) A := by
refine ⟨fun hA i hi => hA (h.mem_of_mem hi), fun hA V hV => ?_⟩ rcases h.mem_iff.mp hV with ⟨i, hi, hV⟩ exact (hA i hi).mono_left hV
import Mathlib.Algebra.DirectSum.Module import Mathlib.Algebra.Module.BigOperators import Mathlib.LinearAlgebra.Isomorphisms import Mathlib.GroupTheory.Torsion import Mathlib.RingTheory.Coprime.Ideal import Mathlib.RingTheory.Finiteness import Mathlib.Data.Set.Lattice #align_import algebra.module.torsion from "leanpr...
Mathlib/Algebra/Module/Torsion.lean
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theorem torsionOf_zero : torsionOf R M (0 : M) = ⊤ := by
simp [torsionOf]
import Mathlib.Algebra.MvPolynomial.Variables #align_import data.mv_polynomial.supported from "leanprover-community/mathlib"@"2f5b500a507264de86d666a5f87ddb976e2d8de4" universe u v w namespace MvPolynomial variable {σ τ : Type*} {R : Type u} {S : Type v} {r : R} {e : ℕ} {n m : σ} section CommSemiring variable...
Mathlib/Algebra/MvPolynomial/Supported.lean
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theorem supported_eq_range_rename (s : Set σ) : supported R s = (rename ((↑) : s → σ)).range := by
rw [supported, Set.image_eq_range, adjoin_range_eq_range_aeval, rename] congr
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
539
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theorem IsNormal.le_iff_deriv {f} (H : IsNormal f) {a} : f a ≤ a ↔ ∃ o, deriv f o = a := by
unfold deriv rw [← le_iff_derivFamily fun _ : Unit => H] exact ⟨fun h _ => h, fun h => h Unit.unit⟩
import Mathlib.Topology.Algebra.Algebra import Mathlib.Topology.ContinuousFunction.Compact import Mathlib.Topology.UrysohnsLemma import Mathlib.Analysis.RCLike.Basic import Mathlib.Analysis.NormedSpace.Units import Mathlib.Topology.Algebra.Module.CharacterSpace #align_import topology.continuous_function.ideals from "...
Mathlib/Topology/ContinuousFunction/Ideals.lean
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theorem mem_setOfIdeal {I : Ideal C(X, R)} {x : X} : x ∈ setOfIdeal I ↔ ∃ f ∈ I, (f : C(X, R)) x ≠ 0 := by
simp_rw [setOfIdeal, Set.mem_compl_iff, Set.mem_setOf]; push_neg; rfl
import Mathlib.RingTheory.Polynomial.Basic import Mathlib.RingTheory.Ideal.LocalRing #align_import data.polynomial.expand from "leanprover-community/mathlib"@"bbeb185db4ccee8ed07dc48449414ebfa39cb821" universe u v w open Polynomial open Finset namespace Polynomial section CommSemiring variable (R : Type u) [...
Mathlib/Algebra/Polynomial/Expand.lean
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theorem expand_aeval {A : Type*} [Semiring A] [Algebra R A] (p : ℕ) (P : R[X]) (r : A) : aeval r (expand R p P) = aeval (r ^ p) P := by
refine Polynomial.induction_on P (fun a => by simp) (fun f g hf hg => ?_) fun n a _ => by simp rw [AlgHom.map_add, aeval_add, aeval_add, hf, hg]
import Mathlib.RingTheory.Nilpotent.Basic import Mathlib.RingTheory.UniqueFactorizationDomain #align_import algebra.squarefree from "leanprover-community/mathlib"@"00d163e35035c3577c1c79fa53b68de17781ffc1" variable {R : Type*} def Squarefree [Monoid R] (r : R) : Prop := ∀ x : R, x * x ∣ r → IsUnit x #align sq...
Mathlib/Algebra/Squarefree/Basic.lean
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theorem Squarefree.eq_zero_or_one_of_pow_of_not_isUnit [CommMonoid R] {x : R} {n : ℕ} (h : Squarefree (x ^ n)) (h' : ¬ IsUnit x) : n = 0 ∨ n = 1 := by
contrapose! h' replace h' : 2 ≤ n := by omega have : x * x ∣ x ^ n := by rw [← sq]; exact pow_dvd_pow x h' exact h.squarefree_of_dvd this x (refl _)
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
1,958
1,960
theorem IsNormal.bsup_eq {f : Ordinal.{u} → Ordinal.{max u v}} (H : IsNormal f) {o : Ordinal.{u}} (h : IsLimit o) : (Ordinal.bsup.{_, v} o fun x _ => f x) = f o := by
rw [← IsNormal.bsup.{u, u, v} H (fun x _ => x) h.1, bsup_id_limit h.2]
import Mathlib.Analysis.Normed.Group.Pointwise import Mathlib.Analysis.NormedSpace.Real #align_import analysis.normed_space.pointwise from "leanprover-community/mathlib"@"bc91ed7093bf098d253401e69df601fc33dde156" open Metric Set open Pointwise Topology variable {𝕜 E : Type*} variable [NormedField 𝕜] sectio...
Mathlib/Analysis/NormedSpace/Pointwise.lean
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theorem closedBall_sub_ball (hε : 0 ≤ ε) (hδ : 0 < δ) (a b : E) : closedBall a ε - ball b δ = ball (a - b) (ε + δ) := by
simp_rw [sub_eq_add_neg, neg_ball, closedBall_add_ball hε hδ]
import Mathlib.Probability.Kernel.CondDistrib #align_import probability.kernel.condexp from "leanprover-community/mathlib"@"00abe0695d8767201e6d008afa22393978bb324d" open MeasureTheory Set Filter TopologicalSpace open scoped ENNReal MeasureTheory ProbabilityTheory namespace ProbabilityTheory variable {Ω F : Ty...
Mathlib/Probability/Kernel/Condexp.lean
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theorem measurable_condexpKernel {s : Set Ω} (hs : MeasurableSet s) : Measurable[m] fun ω => condexpKernel μ m ω s := by
simp_rw [condexpKernel_apply_eq_condDistrib] refine Measurable.mono ?_ (inf_le_left : m ⊓ mΩ ≤ m) le_rfl convert measurable_condDistrib (μ := μ) hs rw [MeasurableSpace.comap_id]
import Mathlib.Logic.Equiv.Fin import Mathlib.Topology.DenseEmbedding import Mathlib.Topology.Support import Mathlib.Topology.Connected.LocallyConnected #align_import topology.homeomorph from "leanprover-community/mathlib"@"4c3e1721c58ef9087bbc2c8c38b540f70eda2e53" open Set Filter open Topology variable {X : Typ...
Mathlib/Topology/Homeomorph.lean
317
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theorem isConnected_preimage {s : Set Y} (h : X ≃ₜ Y) : IsConnected (h ⁻¹' s) ↔ IsConnected s := by
rw [← image_symm, isConnected_image]
import Mathlib.Order.Filter.SmallSets import Mathlib.Tactic.Monotonicity import Mathlib.Topology.Compactness.Compact import Mathlib.Topology.NhdsSet import Mathlib.Algebra.Group.Defs #align_import topology.uniform_space.basic from "leanprover-community/mathlib"@"195fcd60ff2bfe392543bceb0ec2adcdb472db4c" open Set F...
Mathlib/Topology/UniformSpace/Basic.lean
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theorem closure_eq_inter_uniformity {t : Set (α × α)} : closure t = ⋂ d ∈ 𝓤 α, d ○ (t ○ d) := calc closure t = ⋂ (V) (_ : V ∈ 𝓤 α ∧ SymmetricRel V), V ○ t ○ V := closure_eq_uniformity t _ = ⋂ V ∈ 𝓤 α, V ○ t ○ V := Eq.symm <| UniformSpace.hasBasis_symmetric.biInter_mem fun V₁ V₂ hV => ...
simp only [compRel_assoc]
import Mathlib.Data.Sign import Mathlib.Topology.Order.Basic #align_import topology.instances.sign from "leanprover-community/mathlib"@"4c19a16e4b705bf135cf9a80ac18fcc99c438514" instance : TopologicalSpace SignType := ⊥ instance : DiscreteTopology SignType := ⟨rfl⟩ variable {α : Type*} [Zero α] [Topological...
Mathlib/Topology/Instances/Sign.lean
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theorem continuousAt_sign_of_pos {a : α} (h : 0 < a) : ContinuousAt SignType.sign a := by
refine (continuousAt_const : ContinuousAt (fun _ => (1 : SignType)) a).congr ?_ rw [Filter.EventuallyEq, eventually_nhds_iff] exact ⟨{ x | 0 < x }, fun x hx => (sign_pos hx).symm, isOpen_lt' 0, h⟩
import Mathlib.Data.ENNReal.Real import Mathlib.Order.Interval.Finset.Nat import Mathlib.Topology.UniformSpace.Pi import Mathlib.Topology.UniformSpace.UniformConvergence import Mathlib.Topology.UniformSpace.UniformEmbedding #align_import topology.metric_space.emetric_space from "leanprover-community/mathlib"@"c8f3055...
Mathlib/Topology/EMetricSpace/Basic.lean
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theorem edist_triangle_right (x y z : α) : edist x y ≤ edist x z + edist y z := by
rw [edist_comm y]; apply edist_triangle
import Mathlib.Algebra.Group.Support import Mathlib.Order.WellFoundedSet #align_import ring_theory.hahn_series from "leanprover-community/mathlib"@"a484a7d0eade4e1268f4fb402859b6686037f965" set_option linter.uppercaseLean3 false open Finset Function open scoped Classical noncomputable section @[ext] structure ...
Mathlib/RingTheory/HahnSeries/Basic.lean
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theorem embDomain_single {f : Γ ↪o Γ'} {g : Γ} {r : R} : embDomain f (single g r) = single (f g) r := by
ext g' by_cases h : g' = f g · simp [h] rw [embDomain_notin_image_support, single_coeff_of_ne h] by_cases hr : r = 0 · simp [hr] rwa [support_single_of_ne hr, Set.image_singleton, Set.mem_singleton_iff]
import Mathlib.Init.Function import Mathlib.Init.Order.Defs #align_import data.bool.basic from "leanprover-community/mathlib"@"c4658a649d216f57e99621708b09dcb3dcccbd23" namespace Bool @[deprecated (since := "2024-06-07")] alias decide_True := decide_true_eq_true #align bool.to_bool_true decide_true_eq_true @[dep...
Mathlib/Data/Bool/Basic.lean
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theorem and_elim_right : ∀ {a b : Bool}, a && b → b := by
decide
import Mathlib.Data.ZMod.Basic import Mathlib.GroupTheory.Coxeter.Basic namespace CoxeterSystem open List Matrix Function Classical variable {B : Type*} variable {W : Type*} [Group W] variable {M : CoxeterMatrix B} (cs : CoxeterSystem M W) local prefix:100 "s" => cs.simple local prefix:100 "π" => cs.wordProd ...
Mathlib/GroupTheory/Coxeter/Length.lean
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theorem length_mul_simple (w : W) (i : B) : ℓ (w * s i) = ℓ w + 1 ∨ ℓ (w * s i) + 1 = ℓ w := by
rcases Nat.lt_or_gt_of_ne (cs.length_mul_simple_ne w i) with lt | gt · -- lt : ℓ (w * s i) < ℓ w right have length_ge := cs.length_mul_ge_length_sub_length w (s i) simp only [length_simple, tsub_le_iff_right] at length_ge -- length_ge : ℓ w ≤ ℓ (w * s i) + 1 linarith · -- gt : ℓ w < ℓ (w * s ...
import Mathlib.Topology.Algebra.GroupWithZero import Mathlib.Topology.Order.OrderClosed #align_import topology.algebra.with_zero_topology from "leanprover-community/mathlib"@"3e0c4d76b6ebe9dfafb67d16f7286d2731ed6064" open Topology Filter TopologicalSpace Filter Set Function namespace WithZeroTopology variable {α...
Mathlib/Topology/Algebra/WithZeroTopology.lean
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theorem hasBasis_nhds_zero : (𝓝 (0 : Γ₀)).HasBasis (fun γ : Γ₀ => γ ≠ 0) Iio := by
rw [nhds_zero] refine hasBasis_biInf_principal ?_ ⟨1, one_ne_zero⟩ exact directedOn_iff_directed.2 (Monotone.directed_ge fun a b hab => Iio_subset_Iio hab)
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
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theorem hurwitzZeta_neg_nat (hk : k ≠ 0) (hx : x ∈ Icc (0 : ℝ) 1) : hurwitzZeta x (-k) = -1 / (k + 1) * ((Polynomial.bernoulli (k + 1)).map (algebraMap ℚ ℂ)).eval (x : ℂ) := by
rcases Nat.even_or_odd' k with ⟨n, (rfl | rfl)⟩ · exact_mod_cast hurwitzZeta_neg_two_mul_nat (by omega : n ≠ 0) hx · exact_mod_cast hurwitzZeta_one_sub_two_mul_nat (by omega : n + 1 ≠ 0) hx
import Mathlib.MeasureTheory.OuterMeasure.Operations import Mathlib.Analysis.SpecificLimits.Basic #align_import measure_theory.measure.outer_measure from "leanprover-community/mathlib"@"343e80208d29d2d15f8050b929aa50fe4ce71b55" noncomputable section open Set Function Filter open scoped Classical NNReal Topology E...
Mathlib/MeasureTheory/OuterMeasure/OfFunction.lean
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theorem map_ofFunction {β} {f : α → β} (hf : Injective f) : map f (OuterMeasure.ofFunction m m_empty) = OuterMeasure.ofFunction (fun s => m (f ⁻¹' s)) m_empty := by
refine (map_ofFunction_le _).antisymm fun s => ?_ simp only [ofFunction_apply, map_apply, le_iInf_iff] intro t ht refine iInf_le_of_le (fun n => (range f)ᶜ ∪ f '' t n) (iInf_le_of_le ?_ ?_) · rw [← union_iUnion, ← inter_subset, ← image_preimage_eq_inter_range, ← image_iUnion] exact image_subset _ ht · ...
import Batteries.Data.HashMap.Basic import Batteries.Data.Array.Lemmas import Batteries.Data.Nat.Lemmas namespace Batteries.HashMap namespace Imp attribute [-simp] Bool.not_eq_true namespace Buckets @[ext] protected theorem ext : ∀ {b₁ b₂ : Buckets α β}, b₁.1.data = b₂.1.data → b₁ = b₂ | ⟨⟨_⟩, _⟩, ⟨⟨_⟩, _⟩, rfl ...
.lake/packages/batteries/Batteries/Data/HashMap/WF.lean
48
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theorem WF.update [BEq α] [Hashable α] {buckets : Buckets α β} {i d h} (H : buckets.WF) (h₁ : ∀ [PartialEquivBEq α] [LawfulHashable α], (buckets.1[i].toList.Pairwise fun a b => ¬(a.1 == b.1)) → d.toList.Pairwise fun a b => ¬(a.1 == b.1)) (h₂ : (buckets.1[i].All fun k _ => ((hash k).toUSize % buckets...
refine ⟨fun l hl => ?_, fun i hi p hp => ?_⟩ · exact match List.mem_or_eq_of_mem_set hl with | .inl hl => H.1 _ hl | .inr rfl => h₁ (H.1 _ (Array.getElem_mem_data ..)) · revert hp simp only [Array.getElem_eq_data_get, update_data, List.get_set, Array.data_length, update_size] split <;> intro hp ...
import Mathlib.GroupTheory.Abelianization import Mathlib.GroupTheory.Exponent import Mathlib.GroupTheory.Transfer #align_import group_theory.schreier from "leanprover-community/mathlib"@"8350c34a64b9bc3fc64335df8006bffcadc7baa6" open scoped Pointwise namespace Subgroup open MemRightTransversals variable {G : T...
Mathlib/GroupTheory/Schreier.lean
37
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theorem closure_mul_image_mul_eq_top (hR : R ∈ rightTransversals (H : Set G)) (hR1 : (1 : G) ∈ R) (hS : closure S = ⊤) : (closure ((R * S).image fun g => g * (toFun hR g : G)⁻¹)) * R = ⊤ := by
let f : G → R := fun g => toFun hR g let U : Set G := (R * S).image fun g => g * (f g : G)⁻¹ change (closure U : Set G) * R = ⊤ refine top_le_iff.mp fun g _ => ?_ refine closure_induction_right ?_ ?_ ?_ (eq_top_iff.mp hS (mem_top g)) · exact ⟨1, (closure U).one_mem, 1, hR1, one_mul 1⟩ · rintro - - s hs ⟨...
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
433
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theorem IsNormal.inj {f} (H : IsNormal f) {a b} : f a = f b ↔ a = b := by
simp only [le_antisymm_iff, H.le_iff]
import Mathlib.Algebra.Order.Group.Nat import Mathlib.Data.List.Rotate import Mathlib.GroupTheory.Perm.Support #align_import group_theory.perm.list from "leanprover-community/mathlib"@"9003f28797c0664a49e4179487267c494477d853" namespace List variable {α β : Type*} section FormPerm variable [DecidableEq α] (l :...
Mathlib/GroupTheory/Perm/List.lean
241
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theorem support_formPerm_of_nodup' (l : List α) (h : Nodup l) (h' : ∀ x : α, l ≠ [x]) : { x | formPerm l x ≠ x } = l.toFinset := by
apply _root_.le_antisymm · exact support_formPerm_le' l · intro x hx simp only [Finset.mem_coe, mem_toFinset] at hx obtain ⟨⟨n, hn⟩, rfl⟩ := get_of_mem hx rw [Set.mem_setOf_eq, formPerm_apply_get _ h] intro H rw [nodup_iff_injective_get, Function.Injective] at h specialize h H rcases ...
import Mathlib.Logic.Equiv.Option import Mathlib.Order.RelIso.Basic import Mathlib.Order.Disjoint import Mathlib.Order.WithBot import Mathlib.Tactic.Monotonicity.Attr import Mathlib.Util.AssertExists #align_import order.hom.basic from "leanprover-community/mathlib"@"62a5626868683c104774de8d85b9855234ac807c" open ...
Mathlib/Order/Hom/Basic.lean
207
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theorem lt_map_inv_iff (f : F) {a : α} {b : β} : a < EquivLike.inv f b ↔ f a < b := by
rw [← map_lt_map_iff f] simp only [EquivLike.apply_inv_apply]
import Mathlib.Data.ENNReal.Inv #align_import data.real.ennreal from "leanprover-community/mathlib"@"c14c8fcde993801fca8946b0d80131a1a81d1520" open Set NNReal ENNReal namespace ENNReal section iInf variable {ι : Sort*} {f g : ι → ℝ≥0∞} variable {a b c d : ℝ≥0∞} {r p q : ℝ≥0} theorem toNNReal_iInf (hf : ∀ i, f ...
Mathlib/Data/ENNReal/Real.lean
622
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theorem iInf_sum {α : Type*} {f : ι → α → ℝ≥0∞} {s : Finset α} [Nonempty ι] (h : ∀ (t : Finset α) (i j : ι), ∃ k, ∀ a ∈ t, f k a ≤ f i a ∧ f k a ≤ f j a) : ⨅ i, ∑ a ∈ s, f i a = ∑ a ∈ s, ⨅ i, f i a := by
induction' s using Finset.cons_induction_on with a s ha ih · simp only [Finset.sum_empty, ciInf_const] · simp only [Finset.sum_cons, ← ih] refine (iInf_add_iInf fun i j => ?_).symm refine (h (Finset.cons a s ha) i j).imp fun k hk => ?_ rw [Finset.forall_mem_cons] at hk exact add_le_add hk.1.1 (Fi...