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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
84
84
theorem eq_univ_iff_forall : s = univ ↔ ∀ x, x ∈ s := by
simp [ext_iff]
import Mathlib.Algebra.Group.Subgroup.Basic import Mathlib.Algebra.Module.Defs import Mathlib.Algebra.Star.Pi #align_import algebra.star.self_adjoint from "leanprover-community/mathlib"@"a6ece35404f60597c651689c1b46ead86de5ac1b" open Function variable {R A : Type*} def IsSelfAdjoint [Star R] (x : R) : Prop := ...
Mathlib/Algebra/Star/SelfAdjoint.lean
125
126
theorem add {x y : R} (hx : IsSelfAdjoint x) (hy : IsSelfAdjoint y) : IsSelfAdjoint (x + y) := by
simp only [isSelfAdjoint_iff, star_add, hx.star_eq, hy.star_eq]
import Mathlib.Data.Set.Basic #align_import data.set.bool_indicator from "leanprover-community/mathlib"@"fc2ed6f838ce7c9b7c7171e58d78eaf7b438fb0e" open Bool namespace Set variable {α : Type*} (s : Set α) noncomputable def boolIndicator (x : α) := @ite _ (x ∈ s) (Classical.propDecidable _) true false #align s...
Mathlib/Data/Set/BoolIndicator.lean
27
29
theorem mem_iff_boolIndicator (x : α) : x ∈ s ↔ s.boolIndicator x = true := by
unfold boolIndicator split_ifs with h <;> simp [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
80
80
theorem exp_one_rpow (x : ℝ) : exp 1 ^ x = exp x := by
rw [← exp_mul, one_mul]
import Mathlib.CategoryTheory.Limits.FunctorCategory import Mathlib.CategoryTheory.Limits.Types namespace CategoryTheory.FunctorToTypes open CategoryTheory.Limits universe w v₁ v₂ u₁ u₂ variable {J : Type u₁} [Category.{v₁} J] {K : Type u₂} [Category.{v₂} K] variable (F : J ⥤ K ⥤ TypeMax.{u₁, w})
Mathlib/CategoryTheory/Limits/FunctorToTypes.lean
25
29
theorem jointly_surjective (k : K) {t : Cocone F} (h : IsColimit t) (x : t.pt.obj k) : ∃ j y, x = (t.ι.app j).app k y := by
let hev := isColimitOfPreserves ((evaluation _ _).obj k) h obtain ⟨j, y, rfl⟩ := Types.jointly_surjective _ hev x exact ⟨j, y, by simp⟩
import Mathlib.Data.Int.Bitwise import Mathlib.Data.Int.Order.Lemmas import Mathlib.Data.Set.Function import Mathlib.Order.Interval.Set.Basic #align_import data.int.lemmas from "leanprover-community/mathlib"@"09597669f02422ed388036273d8848119699c22f" open Nat namespace Int theorem le_natCast_sub (m n : ℕ) : (m ...
Mathlib/Data/Int/Lemmas.lean
60
61
theorem natAbs_inj_of_nonneg_of_nonneg {a b : ℤ} (ha : 0 ≤ a) (hb : 0 ≤ b) : natAbs a = natAbs b ↔ a = b := by
rw [← sq_eq_sq ha hb, ← natAbs_eq_iff_sq_eq]
import Mathlib.Algebra.Category.ModuleCat.Free import Mathlib.Topology.Category.Profinite.CofilteredLimit import Mathlib.Topology.Category.Profinite.Product import Mathlib.Topology.LocallyConstant.Algebra import Mathlib.Init.Data.Bool.Lemmas universe u namespace Profinite namespace NobelingProof variable {I : Ty...
Mathlib/Topology/Category/Profinite/Nobeling.lean
156
158
theorem projRestricts_eq_id : ProjRestricts C (fun i (h : J i) ↦ h) = id := by
ext ⟨x, y, hy, rfl⟩ i simp (config := { contextual := true }) only [π, Proj, ProjRestricts_coe, id_eq, if_true]
import Mathlib.Order.Filter.Basic import Mathlib.Topology.Bases import Mathlib.Data.Set.Accumulate import Mathlib.Topology.Bornology.Basic import Mathlib.Topology.LocallyFinite open Set Filter Topology TopologicalSpace Classical Function universe u v variable {X : Type u} {Y : Type v} {ι : Type*} variable [Topolog...
Mathlib/Topology/Compactness/Compact.lean
220
229
theorem IsCompact.disjoint_nhdsSet_left {l : Filter X} (hs : IsCompact s) : Disjoint (𝓝ˢ s) l ↔ ∀ x ∈ s, Disjoint (𝓝 x) l := by
refine ⟨fun h x hx => h.mono_left <| nhds_le_nhdsSet hx, fun H => ?_⟩ choose! U hxU hUl using fun x hx => (nhds_basis_opens x).disjoint_iff_left.1 (H x hx) choose hxU hUo using hxU rcases hs.elim_nhds_subcover U fun x hx => (hUo x hx).mem_nhds (hxU x hx) with ⟨t, hts, hst⟩ refine (hasBasis_nhdsSet _).disjoin...
import Mathlib.Data.List.Join #align_import data.list.permutation from "leanprover-community/mathlib"@"dd71334db81d0bd444af1ee339a29298bef40734" -- Make sure we don't import algebra assert_not_exists Monoid open Nat variable {α β : Type*} namespace List theorem permutationsAux2_fst (t : α) (ts : List α) (r : L...
Mathlib/Data/List/Permutation.lean
244
246
theorem map_permutations (f : α → β) (ts : List α) : map (map f) (permutations ts) = permutations (map f ts) := by
rw [permutations, permutations, map, map_permutationsAux, map]
import Mathlib.LinearAlgebra.TensorProduct.RightExactness import Mathlib.LinearAlgebra.TensorProduct.Finiteness universe u variable (R : Type u) [CommRing R] variable {M : Type u} [AddCommGroup M] [Module R M] variable {N : Type u} [AddCommGroup N] [Module R N] open Classical DirectSum LinearMap Function Submodul...
Mathlib/LinearAlgebra/TensorProduct/Vanishing.lean
175
192
theorem vanishesTrivially_of_sum_tmul_eq_zero_of_rTensor_injective (hm : Injective (rTensor N (span R (Set.range m)).subtype)) (hmn : ∑ i, m i ⊗ₜ n i = (0 : M ⊗[R] N)) : VanishesTrivially R m n := by
-- Restrict `m` on the codomain to $M'$, then apply `vanishesTrivially_of_sum_tmul_eq_zero`. have mem_M' i : m i ∈ span R (Set.range m) := subset_span ⟨i, rfl⟩ set m' : ι → span R (Set.range m) := Subtype.coind m mem_M' with m'_eq have hm' : span R (Set.range m') = ⊤ := by apply map_injective_of_injective ...
import Mathlib.Algebra.GCDMonoid.Basic import Mathlib.Data.Multiset.FinsetOps import Mathlib.Data.Multiset.Fold #align_import algebra.gcd_monoid.multiset from "leanprover-community/mathlib"@"f694c7dead66f5d4c80f446c796a5aad14707f0e" namespace Multiset variable {α : Type*} [CancelCommMonoidWithZero α] [NormalizedG...
Mathlib/Algebra/GCDMonoid/Multiset.lean
173
182
theorem gcd_eq_zero_iff (s : Multiset α) : s.gcd = 0 ↔ ∀ x : α, x ∈ s → x = 0 := by
constructor · intro h x hx apply eq_zero_of_zero_dvd rw [← h] apply gcd_dvd hx · refine s.induction_on ?_ ?_ · simp intro a s sgcd h simp [h a (mem_cons_self a s), sgcd fun x hx ↦ h x (mem_cons_of_mem hx)]
import Mathlib.Algebra.Order.Ring.Cast import Mathlib.Data.Int.Cast.Lemmas import Mathlib.Data.Nat.Bitwise import Mathlib.Data.Nat.PSub import Mathlib.Data.Nat.Size import Mathlib.Data.Num.Bitwise #align_import data.num.lemmas from "leanprover-community/mathlib"@"2196ab363eb097c008d4497125e0dde23fb36db2" set_opti...
Mathlib/Data/Num/Lemmas.lean
210
210
theorem add_zero (n : Num) : n + 0 = n := by
cases n <;> rfl
import Mathlib.Algebra.Group.Aut import Mathlib.Algebra.Group.Subgroup.Basic import Mathlib.Logic.Function.Basic #align_import group_theory.semidirect_product from "leanprover-community/mathlib"@"f7fc89d5d5ff1db2d1242c7bb0e9062ce47ef47c" variable (N : Type*) (G : Type*) {H : Type*} [Group N] [Group G] [Group H] ...
Mathlib/GroupTheory/SemidirectProduct.lean
232
232
theorem lift_comp_inl : (lift f₁ f₂ h).comp inl = f₁ := by
ext; simp
import Mathlib.Algebra.CharP.Invertible import Mathlib.Data.ZMod.Basic import Mathlib.RingTheory.Localization.FractionRing import Mathlib.RingTheory.Polynomial.Chebyshev import Mathlib.RingTheory.Ideal.LocalRing #align_import ring_theory.polynomial.dickson from "leanprover-community/mathlib"@"70fd9563a21e7b963887c936...
Mathlib/RingTheory/Polynomial/Dickson.lean
77
78
theorem dickson_two : dickson k a 2 = X ^ 2 - C a * (3 - k : R[X]) := by
simp only [dickson, sq]
import Mathlib.Logic.Relation import Mathlib.Data.Option.Basic import Mathlib.Data.Seq.Seq #align_import data.seq.wseq from "leanprover-community/mathlib"@"a7e36e48519ab281320c4d192da6a7b348ce40ad" namespace Stream' open Function universe u v w def WSeq (α) := Seq (Option α) #align stream.wseq Stream'.WSeq ...
Mathlib/Data/Seq/WSeq.lean
663
663
theorem head_think (s : WSeq α) : head (think s) = (head s).think := by
simp [head]
import Mathlib.Algebra.Polynomial.Degree.TrailingDegree import Mathlib.Algebra.Polynomial.EraseLead import Mathlib.Algebra.Polynomial.Eval #align_import data.polynomial.reverse from "leanprover-community/mathlib"@"44de64f183393284a16016dfb2a48ac97382f2bd" namespace Polynomial open Polynomial Finsupp Finset open...
Mathlib/Algebra/Polynomial/Reverse.lean
254
255
theorem coeff_reverse (f : R[X]) (n : ℕ) : f.reverse.coeff n = f.coeff (revAt f.natDegree n) := by
rw [reverse, coeff_reflect]
import Mathlib.Analysis.InnerProductSpace.GramSchmidtOrtho import Mathlib.LinearAlgebra.Orientation #align_import analysis.inner_product_space.orientation from "leanprover-community/mathlib"@"bd65478311e4dfd41f48bf38c7e3b02fb75d0163" noncomputable section variable {E : Type*} [NormedAddCommGroup E] [InnerProduct...
Mathlib/Analysis/InnerProductSpace/Orientation.lean
65
69
theorem det_to_matrix_orthonormalBasis_of_opposite_orientation (h : e.toBasis.orientation ≠ f.toBasis.orientation) : e.toBasis.det f = -1 := by
contrapose! h simp [e.toBasis.orientation_eq_iff_det_pos, (e.det_to_matrix_orthonormalBasis_real f).resolve_right h]
import Mathlib.Algebra.Associated import Mathlib.Algebra.Star.Unitary import Mathlib.RingTheory.Int.Basic import Mathlib.RingTheory.PrincipalIdealDomain import Mathlib.Tactic.Ring #align_import number_theory.zsqrtd.basic from "leanprover-community/mathlib"@"e8638a0fcaf73e4500469f368ef9494e495099b3" @[ext] struct...
Mathlib/NumberTheory/Zsqrtd/Basic.lean
305
305
theorem smul_val (n x y : ℤ) : (n : ℤ√d) * ⟨x, y⟩ = ⟨n * x, n * y⟩ := by
ext <;> simp
import Mathlib.MeasureTheory.Integral.IntervalIntegral import Mathlib.Data.Set.Function #align_import analysis.sum_integral_comparisons from "leanprover-community/mathlib"@"9003f28797c0664a49e4179487267c494477d853" open Set MeasureTheory.MeasureSpace variable {x₀ : ℝ} {a b : ℕ} {f : ℝ → ℝ} theorem AntitoneOn.in...
Mathlib/Analysis/SumIntegralComparisons.lean
73
95
theorem AntitoneOn.integral_le_sum_Ico (hab : a ≤ b) (hf : AntitoneOn f (Set.Icc a b)) : (∫ x in a..b, f x) ≤ ∑ x ∈ Finset.Ico a b, f x := by
rw [(Nat.sub_add_cancel hab).symm, Nat.cast_add] conv => congr congr · skip · skip rw [add_comm] · skip · skip congr congr rw [← zero_add a] rw [← Finset.sum_Ico_add, Nat.Ico_zero_eq_range] conv => rhs congr · skip ext rw [Nat.cast_add] apply Antito...
import Mathlib.CategoryTheory.Sites.IsSheafFor import Mathlib.CategoryTheory.Limits.Shapes.Types import Mathlib.Tactic.ApplyFun #align_import category_theory.sites.sheaf_of_types from "leanprover-community/mathlib"@"70fd9563a21e7b963887c9360bd29b2393e6225a" universe w v u namespace CategoryTheory open Opposite ...
Mathlib/CategoryTheory/Sites/EqualizerSheafCondition.lean
142
152
theorem compatible_iff (x : FirstObj P S) : ((firstObjEqFamily P S).hom x).Compatible ↔ firstMap P S x = secondMap P S x := by
rw [Presieve.compatible_iff_sieveCompatible] constructor · intro t apply SecondObj.ext intros Y Z g f hf simpa [firstMap, secondMap] using t _ g hf · intro t Y Z f g hf rw [Types.limit_ext_iff'] at t simpa [firstMap, secondMap] using t ⟨⟨Y, Z, g, f, hf⟩⟩
import Mathlib.Analysis.Asymptotics.Asymptotics import Mathlib.Analysis.Asymptotics.Theta import Mathlib.Analysis.Normed.Order.Basic #align_import analysis.asymptotics.asymptotic_equivalent from "leanprover-community/mathlib"@"f2ce6086713c78a7f880485f7917ea547a215982" namespace Asymptotics open Filter Function ...
Mathlib/Analysis/Asymptotics/AsymptoticEquivalent.lean
187
190
theorem IsEquivalent.neg (huv : u ~[l] v) : (fun x ↦ -u x) ~[l] fun x ↦ -v x := by
rw [IsEquivalent] convert huv.isLittleO.neg_left.neg_right simp [neg_add_eq_sub]
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
390
406
theorem isOpen_iff_dist (s : Set (∀ n, E n)) : IsOpen s ↔ ∀ x ∈ s, ∃ ε > 0, ∀ y, dist x y < ε → y ∈ s := by
constructor · intro hs x hx obtain ⟨v, ⟨y, n, rfl⟩, h'x, h's⟩ : ∃ v ∈ { s | ∃ (x : ∀ n : ℕ, E n) (n : ℕ), s = cylinder x n }, x ∈ v ∧ v ⊆ s := (isTopologicalBasis_cylinders E).exists_subset_of_mem_open hx hs rw [← mem_cylinder_iff_eq.1 h'x] at h's exact ⟨(1 / 2 : ℝ) ^ n, by simp, fu...
import Mathlib.Geometry.RingedSpace.PresheafedSpace.Gluing import Mathlib.AlgebraicGeometry.OpenImmersion #align_import algebraic_geometry.gluing from "leanprover-community/mathlib"@"533f62f4dd62a5aad24a04326e6e787c8f7e98b1" set_option linter.uppercaseLean3 false noncomputable section universe u open Topologica...
Mathlib/AlgebraicGeometry/Gluing.lean
308
310
theorem gluedCoverT'_snd_fst (x y z : 𝒰.J) : gluedCoverT' 𝒰 x y z ≫ pullback.snd ≫ pullback.fst = pullback.fst ≫ pullback.snd := by
delta gluedCoverT'; simp
import Mathlib.Data.Matrix.Basis import Mathlib.Data.Matrix.DMatrix import Mathlib.LinearAlgebra.Matrix.Determinant.Basic import Mathlib.LinearAlgebra.Matrix.Reindex import Mathlib.Tactic.FieldSimp #align_import linear_algebra.matrix.transvection from "leanprover-community/mathlib"@"0e2aab2b0d521f060f62a14d2cf2e2c54e...
Mathlib/LinearAlgebra/Matrix/Transvection.lean
125
127
theorem mul_transvection_apply_same (a : n) (c : R) (M : Matrix n n R) : (M * transvection i j c) a j = M a j + c * M a i := by
simp [transvection, Matrix.mul_add, mul_comm]
import Mathlib.Analysis.Asymptotics.AsymptoticEquivalent import Mathlib.Analysis.Calculus.FDeriv.Linear import Mathlib.Analysis.Calculus.FDeriv.Comp #align_import analysis.calculus.fderiv.equiv from "leanprover-community/mathlib"@"e3fb84046afd187b710170887195d50bada934ee" open Filter Asymptotics ContinuousLinearMa...
Mathlib/Analysis/Calculus/FDeriv/Equiv.lean
486
492
theorem has_fderiv_at_filter_real_equiv {L : Filter E} : Tendsto (fun x' : E => ‖x' - x‖⁻¹ * ‖f x' - f x - f' (x' - x)‖) L (𝓝 0) ↔ Tendsto (fun x' : E => ‖x' - x‖⁻¹ • (f x' - f x - f' (x' - x))) L (𝓝 0) := by
symm rw [tendsto_iff_norm_sub_tendsto_zero] refine tendsto_congr fun x' => ?_ simp [norm_smul]
import Mathlib.Data.Finsupp.Multiset import Mathlib.Data.Nat.GCD.BigOperators import Mathlib.Data.Nat.PrimeFin import Mathlib.NumberTheory.Padics.PadicVal import Mathlib.Order.Interval.Finset.Nat #align_import data.nat.factorization.basic from "leanprover-community/mathlib"@"f694c7dead66f5d4c80f446c796a5aad14707f0e" ...
Mathlib/Data/Nat/Factorization/Basic.lean
646
652
theorem factorization_lcm {a b : ℕ} (ha : a ≠ 0) (hb : b ≠ 0) : (a.lcm b).factorization = a.factorization ⊔ b.factorization := by
rw [← add_right_inj (a.gcd b).factorization, ← factorization_mul (mt gcd_eq_zero_iff.1 fun h => ha h.1) (lcm_ne_zero ha hb), gcd_mul_lcm, factorization_gcd ha hb, factorization_mul ha hb] ext1 exact (min_add_max _ _).symm
import Mathlib.Algebra.Group.Commutator import Mathlib.Algebra.Group.Subgroup.Finite import Mathlib.Data.Bracket import Mathlib.GroupTheory.Subgroup.Centralizer import Mathlib.Tactic.Group #align_import group_theory.commutator from "leanprover-community/mathlib"@"4be589053caf347b899a494da75410deb55fb3ef" variable...
Mathlib/GroupTheory/Commutator.lean
100
104
theorem commutator_eq_bot_iff_le_centralizer : ⁅H₁, H₂⁆ = ⊥ ↔ H₁ ≤ centralizer H₂ := by
rw [eq_bot_iff, commutator_le] refine forall_congr' fun p => forall_congr' fun _hp => forall_congr' fun q => forall_congr' fun hq => ?_ rw [mem_bot, commutatorElement_eq_one_iff_mul_comm, eq_comm]
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
452
463
theorem isTopologicalBasis_basic_opens : TopologicalSpace.IsTopologicalBasis (Set.range fun r : A => (basicOpen 𝒜 r : Set (ProjectiveSpectrum 𝒜))) := by
apply TopologicalSpace.isTopologicalBasis_of_isOpen_of_nhds · rintro _ ⟨r, rfl⟩ exact isOpen_basicOpen 𝒜 · rintro p U hp ⟨s, hs⟩ rw [← compl_compl U, Set.mem_compl_iff, ← hs, mem_zeroLocus, Set.not_subset] at hp obtain ⟨f, hfs, hfp⟩ := hp refine ⟨basicOpen 𝒜 f, ⟨f, rfl⟩, hfp, ?_⟩ rw [← Set....
import Mathlib.RingTheory.IntegralClosure import Mathlib.RingTheory.FractionalIdeal.Basic #align_import ring_theory.fractional_ideal from "leanprover-community/mathlib"@"ed90a7d327c3a5caf65a6faf7e8a0d63c4605df7" open IsLocalization Pointwise nonZeroDivisors namespace FractionalIdeal open Set Submodule variable...
Mathlib/RingTheory/FractionalIdeal/Operations.lean
487
496
theorem div_one {I : FractionalIdeal R₁⁰ K} : I / 1 = I := by
rw [div_nonzero (one_ne_zero' (FractionalIdeal R₁⁰ K))] ext constructor <;> intro h · simpa using mem_div_iff_forall_mul_mem.mp h 1 ((algebraMap R₁ K).map_one ▸ coe_mem_one R₁⁰ 1) · apply mem_div_iff_forall_mul_mem.mpr rintro y ⟨y', _, rfl⟩ -- Porting note: this used to be { convert; rw }, flipped th...
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
517
519
theorem closure_iUnion_of_finite [Finite ι] (f : ι → Set X) : closure (⋃ i, f i) = ⋃ i, closure (f i) := by
rw [← sUnion_range, (finite_range _).closure_sUnion, biUnion_range]
import Mathlib.Data.Multiset.Basic import Mathlib.Data.Vector.Basic import Mathlib.Data.Setoid.Basic import Mathlib.Tactic.ApplyFun #align_import data.sym.basic from "leanprover-community/mathlib"@"509de852e1de55e1efa8eacfa11df0823f26f226" assert_not_exists MonoidWithZero set_option autoImplicit true open Funct...
Mathlib/Data/Sym/Basic.lean
527
530
theorem append_comm (s : Sym α n') (s' : Sym α n') : s.append s' = Sym.cast (add_comm _ _) (s'.append s) := by
ext simp [append, add_comm]
import Mathlib.Order.Hom.CompleteLattice import Mathlib.Topology.Bases import Mathlib.Topology.Homeomorph import Mathlib.Topology.ContinuousFunction.Basic import Mathlib.Order.CompactlyGenerated.Basic import Mathlib.Order.Copy #align_import topology.sets.opens from "leanprover-community/mathlib"@"dc6c365e751e34d100e8...
Mathlib/Topology/Sets/Opens.lean
283
286
theorem eq_bot_or_top {α} [t : TopologicalSpace α] (h : t = ⊤) (U : Opens α) : U = ⊥ ∨ U = ⊤ := by
subst h; letI : TopologicalSpace α := ⊤ rw [← coe_eq_empty, ← coe_eq_univ, ← isOpen_top_iff] exact U.2
import Mathlib.Analysis.Calculus.Deriv.Basic import Mathlib.Analysis.Calculus.Deriv.Slope import Mathlib.Analysis.NormedSpace.FiniteDimension import Mathlib.MeasureTheory.Constructions.BorelSpace.ContinuousLinearMap import Mathlib.MeasureTheory.Function.StronglyMeasurable.Basic #align_import analysis.calculus.fderiv_...
Mathlib/Analysis/Calculus/FDeriv/Measurable.lean
223
357
theorem D_subset_differentiable_set {K : Set (E →L[𝕜] F)} (hK : IsComplete K) : D f K ⊆ { x | DifferentiableAt 𝕜 f x ∧ fderiv 𝕜 f x ∈ K } := by
have P : ∀ {n : ℕ}, (0 : ℝ) < (1 / 2) ^ n := fun {n} => pow_pos (by norm_num) n rcases NormedField.exists_one_lt_norm 𝕜 with ⟨c, hc⟩ intro x hx have : ∀ e : ℕ, ∃ n : ℕ, ∀ p q, n ≤ p → n ≤ q → ∃ L ∈ K, x ∈ A f L ((1 / 2) ^ p) ((1 / 2) ^ e) ∩ A f L ((1 / 2) ^ q) ((1 / 2) ^ e) := by intro e hav...
import Mathlib.LinearAlgebra.Basis import Mathlib.LinearAlgebra.BilinearMap #align_import linear_algebra.basis.bilinear from "leanprover-community/mathlib"@"87c54600fe3cdc7d32ff5b50873ac724d86aef8d" namespace LinearMap variable {ι₁ ι₂ : Type*} variable {R R₂ S S₂ M N P Rₗ : Type*} variable {Mₗ Nₗ Pₗ : Type*} --...
Mathlib/LinearAlgebra/Basis/Bilinear.lean
55
60
theorem sum_repr_mul_repr_mul {B : Mₗ →ₗ[Rₗ] Nₗ →ₗ[Rₗ] Pₗ} (x y) : ((b₁'.repr x).sum fun i xi => (b₂'.repr y).sum fun j yj => xi • yj • B (b₁' i) (b₂' j)) = B x y := by
conv_rhs => rw [← b₁'.total_repr x, ← b₂'.total_repr y] simp_rw [Finsupp.total_apply, Finsupp.sum, map_sum₂, map_sum, LinearMap.map_smul₂, LinearMap.map_smul]
import Mathlib.MeasureTheory.Constructions.BorelSpace.Metric import Mathlib.Topology.Metrizable.Basic import Mathlib.Topology.IndicatorConstPointwise #align_import measure_theory.constructions.borel_space.metrizable from "leanprover-community/mathlib"@"bf6a01357ff5684b1ebcd0f1a13be314fc82c0bf" open Filter MeasureT...
Mathlib/MeasureTheory/Constructions/BorelSpace/Metrizable.lean
57
78
theorem aemeasurable_of_tendsto_metrizable_ae {ι} {μ : Measure α} {f : ι → α → β} {g : α → β} (u : Filter ι) [hu : NeBot u] [IsCountablyGenerated u] (hf : ∀ n, AEMeasurable (f n) μ) (h_tendsto : ∀ᵐ x ∂μ, Tendsto (fun n => f n x) u (𝓝 (g x))) : AEMeasurable g μ := by
rcases u.exists_seq_tendsto with ⟨v, hv⟩ have h'f : ∀ n, AEMeasurable (f (v n)) μ := fun n => hf (v n) set p : α → (ℕ → β) → Prop := fun x f' => Tendsto (fun n => f' n) atTop (𝓝 (g x)) have hp : ∀ᵐ x ∂μ, p x fun n => f (v n) x := by filter_upwards [h_tendsto] with x hx using hx.comp hv set aeSeqLim := f...
import Mathlib.Algebra.BigOperators.Associated import Mathlib.Algebra.Order.Ring.Abs import Mathlib.Data.Nat.Choose.Sum import Mathlib.Data.Nat.Choose.Dvd import Mathlib.Data.Nat.Prime #align_import number_theory.primorial from "leanprover-community/mathlib"@"0a0ec35061ed9960bf0e7ffb0335f44447b58977" open Finset ...
Mathlib/NumberTheory/Primorial.lean
51
55
theorem primorial_add (m n : ℕ) : (m + n)# = m# * ∏ p ∈ filter Nat.Prime (Ico (m + 1) (m + n + 1)), p := by
rw [primorial, primorial, ← Ico_zero_eq_range, ← prod_union, ← filter_union, Ico_union_Ico_eq_Ico] exacts [Nat.zero_le _, add_le_add_right (Nat.le_add_right _ _) _, disjoint_filter_filter <| Ico_disjoint_Ico_consecutive _ _ _]
import Mathlib.Order.CompleteLattice import Mathlib.Data.Finset.Lattice import Mathlib.CategoryTheory.Limits.Shapes.Pullbacks import Mathlib.CategoryTheory.Category.Preorder import Mathlib.CategoryTheory.Limits.Shapes.Products import Mathlib.CategoryTheory.Limits.Shapes.FiniteLimits #align_import category_theory.limi...
Mathlib/CategoryTheory/Limits/Lattice.lean
156
163
theorem pullback_eq_inf [SemilatticeInf α] [OrderTop α] {x y z : α} (f : x ⟶ z) (g : y ⟶ z) : pullback f g = x ⊓ y := calc pullback f g = limit (cospan f g) := rfl _ = Finset.univ.inf (cospan f g).obj := by
rw [finite_limit_eq_finset_univ_inf] _ = z ⊓ (x ⊓ (y ⊓ ⊤)) := rfl _ = z ⊓ (x ⊓ y) := by rw [inf_top_eq] _ = x ⊓ y := inf_eq_right.mpr (inf_le_of_left_le f.le)
import Mathlib.Analysis.NormedSpace.PiLp import Mathlib.Analysis.InnerProductSpace.PiL2 #align_import analysis.matrix from "leanprover-community/mathlib"@"46b633fd842bef9469441c0209906f6dddd2b4f5" noncomputable section open scoped NNReal Matrix namespace Matrix variable {R l m n α β : Type*} [Fintype l] [Fintyp...
Mathlib/Analysis/Matrix.lean
585
587
theorem frobenius_nnnorm_transpose (A : Matrix m n α) : ‖Aᵀ‖₊ = ‖A‖₊ := by
rw [frobenius_nnnorm_def, frobenius_nnnorm_def, Finset.sum_comm] simp_rw [Matrix.transpose_apply] -- Porting note: added
import Mathlib.Algebra.Polynomial.Derivative import Mathlib.Tactic.LinearCombination #align_import ring_theory.polynomial.chebyshev from "leanprover-community/mathlib"@"d774451114d6045faeb6751c396bea1eb9058946" namespace Polynomial.Chebyshev set_option linter.uppercaseLean3 false -- `T` `U` `X` open Polynomial v...
Mathlib/RingTheory/Polynomial/Chebyshev.lean
222
223
theorem T_eq_U_sub_X_mul_U (n : ℤ) : T R n = U R n - X * U R (n - 1) := by
linear_combination (norm := ring_nf) - U_eq_X_mul_U_add_T R (n - 1)
import Mathlib.Algebra.BigOperators.Intervals import Mathlib.Algebra.GeomSum import Mathlib.Algebra.Order.Ring.Abs import Mathlib.Data.Nat.Bitwise import Mathlib.Data.Nat.Log import Mathlib.Data.Nat.Prime import Mathlib.Data.Nat.Digits import Mathlib.RingTheory.Multiplicity #align_import data.nat.multiplicity from "l...
Mathlib/Data/Nat/Multiplicity.lean
185
195
theorem multiplicity_choose_aux {p n b k : ℕ} (hp : p.Prime) (hkn : k ≤ n) : ∑ i ∈ Finset.Ico 1 b, n / p ^ i = ((∑ i ∈ Finset.Ico 1 b, k / p ^ i) + ∑ i ∈ Finset.Ico 1 b, (n - k) / p ^ i) + ((Finset.Ico 1 b).filter fun i => p ^ i ≤ k % p ^ i + (n - k) % p ^ i).card := calc ∑ i ∈ Finset.Ico 1 b, n...
simp only [add_tsub_cancel_of_le hkn] _ = ∑ i ∈ Finset.Ico 1 b, (k / p ^ i + (n - k) / p ^ i + if p ^ i ≤ k % p ^ i + (n - k) % p ^ i then 1 else 0) := by simp only [Nat.add_div (pow_pos hp.pos _)] _ = _ := by simp [sum_add_distrib, sum_boole]
import Mathlib.Data.Set.Function import Mathlib.Analysis.BoundedVariation #align_import analysis.constant_speed from "leanprover-community/mathlib"@"f0c8bf9245297a541f468be517f1bde6195105e9" open scoped NNReal ENNReal open Set MeasureTheory Classical variable {α : Type*} [LinearOrder α] {E : Type*} [PseudoEMetr...
Mathlib/Analysis/ConstantSpeed.lean
71
82
theorem hasConstantSpeedOnWith_iff_ordered : HasConstantSpeedOnWith f s l ↔ ∀ ⦃x⦄ (_ : x ∈ s) ⦃y⦄ (_ : y ∈ s), x ≤ y → eVariationOn f (s ∩ Icc x y) = ENNReal.ofReal (l * (y - x)) := by
refine ⟨fun h x xs y ys _ => h xs ys, fun h x xs y ys => ?_⟩ rcases le_total x y with (xy | yx) · exact h xs ys xy · rw [eVariationOn.subsingleton, ENNReal.ofReal_of_nonpos] · exact mul_nonpos_of_nonneg_of_nonpos l.prop (sub_nonpos_of_le yx) · rintro z ⟨zs, xz, zy⟩ w ⟨ws, xw, wy⟩ cases le_antisym...
import Mathlib.Algebra.CharP.Invertible import Mathlib.Algebra.Order.Interval.Set.Group import Mathlib.Analysis.Convex.Segment import Mathlib.LinearAlgebra.AffineSpace.FiniteDimensional import Mathlib.Tactic.FieldSimp #align_import analysis.convex.between from "leanprover-community/mathlib"@"571e13cacbed7bf042fd3058c...
Mathlib/Analysis/Convex/Between.lean
327
330
theorem Wbtw.left_ne_right_of_ne_right {x y z : P} (h : Wbtw R x y z) (hne : y ≠ z) : x ≠ z := by
rintro rfl rw [wbtw_self_iff] at h exact hne h
import Mathlib.CategoryTheory.Filtered.Basic import Mathlib.Data.Set.Finite import Mathlib.Data.Set.Subsingleton import Mathlib.Topology.Category.TopCat.Limits.Konig import Mathlib.Tactic.AdaptationNote #align_import category_theory.cofiltered_system from "leanprover-community/mathlib"@"178a32653e369dce2da68dc6b2694e...
Mathlib/CategoryTheory/CofilteredSystem.lean
114
120
theorem nonempty_sections_of_finite_inverse_system {J : Type u} [Preorder J] [IsDirected J (· ≤ ·)] (F : Jᵒᵖ ⥤ Type v) [∀ j : Jᵒᵖ, Finite (F.obj j)] [∀ j : Jᵒᵖ, Nonempty (F.obj j)] : F.sections.Nonempty := by
cases isEmpty_or_nonempty J · haveI : IsEmpty Jᵒᵖ := ⟨fun j => isEmptyElim j.unop⟩ -- TODO: this should be a global instance exact ⟨isEmptyElim, by apply isEmptyElim⟩ · exact nonempty_sections_of_finite_cofiltered_system _
import Mathlib.CategoryTheory.Limits.Preserves.Shapes.Equalizers import Mathlib.CategoryTheory.Limits.Preserves.Shapes.Products import Mathlib.CategoryTheory.Limits.Yoneda import Mathlib.CategoryTheory.Preadditive.FunctorCategory import Mathlib.CategoryTheory.Sites.SheafOfTypes import Mathlib.CategoryTheory.Sites.Equa...
Mathlib/CategoryTheory/Sites/Sheaf.lean
168
187
theorem subsingleton_iff_isSeparatedFor : (∀ c, Subsingleton (c ⟶ P.mapCone S.arrows.cocone.op)) ↔ ∀ E : Aᵒᵖ, IsSeparatedFor (P ⋙ coyoneda.obj E) S.arrows := by
constructor · intro hs E x t₁ t₂ h₁ h₂ have hx := is_compatible_of_exists_amalgamation x ⟨t₁, h₁⟩ rw [compatible_iff_sieveCompatible] at hx specialize hs hx.cone rcases hs with ⟨hs⟩ simpa only [Subtype.mk.injEq] using (show Subtype.mk t₁ h₁ = ⟨t₂, h₂⟩ from (homEquivAmalgamation hx).symm.i...
import Mathlib.CategoryTheory.CofilteredSystem import Mathlib.Combinatorics.SimpleGraph.Connectivity import Mathlib.Data.Finite.Set #align_import combinatorics.simple_graph.ends.defs from "leanprover-community/mathlib"@"b99e2d58a5e6861833fa8de11e51a81144258db4" universe u variable {V : Type u} (G : SimpleGraph V...
Mathlib/Combinatorics/SimpleGraph/Ends/Defs.lean
154
168
theorem exists_adj_boundary_pair (Gc : G.Preconnected) (hK : K.Nonempty) : ∀ C : G.ComponentCompl K, ∃ ck : V × V, ck.1 ∈ C ∧ ck.2 ∈ K ∧ G.Adj ck.1 ck.2 := by
refine ComponentCompl.ind fun v vnK => ?_ let C : G.ComponentCompl K := G.componentComplMk vnK let dis := Set.disjoint_iff.mp C.disjoint_right by_contra! h suffices Set.univ = (C : Set V) by exact dis ⟨hK.choose_spec, this ▸ Set.mem_univ hK.some⟩ symm rw [Set.eq_univ_iff_forall] rintro u by_contra un...
import Mathlib.Algebra.Group.Basic import Mathlib.Algebra.Group.Pi.Basic import Mathlib.Order.Fin import Mathlib.Order.PiLex import Mathlib.Order.Interval.Set.Basic #align_import data.fin.tuple.basic from "leanprover-community/mathlib"@"ef997baa41b5c428be3fb50089a7139bf4ee886b" assert_not_exists MonoidWithZero un...
Mathlib/Data/Fin/Tuple/Basic.lean
580
586
theorem update_snoc_last : update (snoc p x) (last n) z = snoc p z := by
ext j by_cases h : j.val < n · have : j ≠ last n := ne_of_lt h simp [h, update_noteq, this, snoc] · rw [eq_last_of_not_lt h] simp
import Mathlib.RingTheory.PowerSeries.Trunc import Mathlib.RingTheory.PowerSeries.Inverse import Mathlib.RingTheory.Derivation.Basic namespace PowerSeries open Polynomial Derivation Nat section CommutativeSemiring variable {R} [CommSemiring R] noncomputable def derivativeFun (f : R⟦X⟧) : R⟦X⟧ := mk fun n ↦ coef...
Mathlib/RingTheory/PowerSeries/Derivative.lean
45
47
theorem derivativeFun_coe (f : R[X]) : (f : R⟦X⟧).derivativeFun = derivative f := by
ext rw [coeff_derivativeFun, coeff_coe, coeff_coe, coeff_derivative]
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
212
213
theorem continuum_power_aleph0 : continuum.{u} ^ aleph0.{u} = 𝔠 := by
rw [← two_power_aleph0, ← power_mul, mul_eq_left le_rfl le_rfl aleph0_ne_zero]
import Mathlib.LinearAlgebra.Dimension.LinearMap import Mathlib.LinearAlgebra.FreeModule.StrongRankCondition #align_import linear_algebra.free_module.finite.matrix from "leanprover-community/mathlib"@"b1c23399f01266afe392a0d8f71f599a0dad4f7b" universe u u' v w variable (R : Type u) (S : Type u') (M : Type v) (N ...
Mathlib/LinearAlgebra/FreeModule/Finite/Matrix.lean
59
61
theorem FiniteDimensional.finrank_linearMap : finrank S (M →ₗ[R] N) = finrank R M * finrank S N := by
simp_rw [finrank, rank_linearMap, toNat_mul, toNat_lift]
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
134
141
theorem index (H : Subgroup G) [H.FiniteIndex] : ∃ n : ℕ, H.index = p ^ n := by
haveI := H.normalCore.fintypeQuotientOfFiniteIndex obtain ⟨n, hn⟩ := iff_card.mp (hG.to_quotient H.normalCore) obtain ⟨k, _, hk2⟩ := (Nat.dvd_prime_pow hp.out).mp ((congr_arg _ (H.normalCore.index_eq_card.trans hn)).mp (Subgroup.index_dvd_of_le H.normalCore_le)) exact ⟨k, hk2⟩
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
55
57
theorem not_squarefree_zero [MonoidWithZero R] [Nontrivial R] : ¬Squarefree (0 : R) := by
erw [not_forall] exact ⟨0, by simp⟩
import Mathlib.Algebra.Module.BigOperators import Mathlib.Data.Fintype.BigOperators import Mathlib.LinearAlgebra.AffineSpace.AffineMap import Mathlib.LinearAlgebra.AffineSpace.AffineSubspace import Mathlib.LinearAlgebra.Finsupp import Mathlib.Tactic.FinCases #align_import linear_algebra.affine_space.combination from ...
Mathlib/LinearAlgebra/AffineSpace/Combination.lean
420
422
theorem weightedVSub_vadd_affineCombination (w₁ w₂ : ι → k) (p : ι → P) : s.weightedVSub p w₁ +ᵥ s.affineCombination k p w₂ = s.affineCombination k p (w₁ + w₂) := by
rw [← vadd_eq_add, AffineMap.map_vadd, affineCombination_linear]
import Mathlib.LinearAlgebra.Span import Mathlib.LinearAlgebra.BilinearMap #align_import algebra.module.submodule.bilinear from "leanprover-community/mathlib"@"6010cf523816335f7bae7f8584cb2edaace73940" universe uι u v open Set open Pointwise namespace Submodule variable {ι : Sort uι} {R M N P : Type*} variabl...
Mathlib/Algebra/Module/Submodule/Bilinear.lean
166
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theorem map₂_span_singleton_eq_map_flip (f : M →ₗ[R] N →ₗ[R] P) (s : Submodule R M) (n : N) : map₂ f s (span R {n}) = map (f.flip n) s := by
rw [← map₂_span_singleton_eq_map, map₂_flip]
import Mathlib.Algebra.Algebra.Defs import Mathlib.Algebra.Polynomial.FieldDivision import Mathlib.FieldTheory.Minpoly.Basic import Mathlib.RingTheory.Adjoin.Basic import Mathlib.RingTheory.FinitePresentation import Mathlib.RingTheory.FiniteType import Mathlib.RingTheory.PowerBasis import Mathlib.RingTheory.PrincipalI...
Mathlib/RingTheory/AdjoinRoot.lean
795
800
theorem Polynomial.quotQuotEquivComm_symm_mk_mk (p : R[X]) : (Polynomial.quotQuotEquivComm I f).symm (Ideal.Quotient.mk (span ({(Ideal.Quotient.mk (I.map C)) f} : Set (R[X] ⧸ (I.map C)))) (Ideal.Quotient.mk (I.map C) p)) = Ideal.Quotient.mk (span {f.map (Ideal.Quotient.mk I)}) (p.map (Ideal.Quotient.mk I)...
simp only [Polynomial.quotQuotEquivComm, quotientEquiv_symm_mk, polynomialQuotientEquivQuotientPolynomial_symm_mk]
import Mathlib.Logic.Relation import Mathlib.Data.Option.Basic import Mathlib.Data.Seq.Seq #align_import data.seq.wseq from "leanprover-community/mathlib"@"a7e36e48519ab281320c4d192da6a7b348ce40ad" namespace Stream' open Function universe u v w def WSeq (α) := Seq (Option α) #align stream.wseq Stream'.WSeq ...
Mathlib/Data/Seq/WSeq.lean
1,431
1,434
theorem map_comp (f : α → β) (g : β → γ) (s : WSeq α) : map (g ∘ f) s = map g (map f s) := by
dsimp [map]; rw [← Seq.map_comp] apply congr_fun; apply congr_arg ext ⟨⟩ <;> rfl
import Mathlib.Probability.Kernel.Composition #align_import probability.kernel.invariance from "leanprover-community/mathlib"@"3b92d54a05ee592aa2c6181a4e76b1bb7cc45d0b" open MeasureTheory open scoped MeasureTheory ENNReal ProbabilityTheory namespace ProbabilityTheory variable {α β γ : Type*} {mα : MeasurableSp...
Mathlib/Probability/Kernel/Invariance.lean
43
47
theorem bind_add (μ ν : Measure α) (κ : kernel α β) : (μ + ν).bind κ = μ.bind κ + ν.bind κ := by
ext1 s hs rw [Measure.bind_apply hs (kernel.measurable _), lintegral_add_measure, Measure.coe_add, Pi.add_apply, Measure.bind_apply hs (kernel.measurable _), Measure.bind_apply hs (kernel.measurable _)]
import Mathlib.Data.DFinsupp.Basic #align_import data.dfinsupp.ne_locus from "leanprover-community/mathlib"@"f7fc89d5d5ff1db2d1242c7bb0e9062ce47ef47c" variable {α : Type*} {N : α → Type*} namespace DFinsupp variable [DecidableEq α] section NHasZero variable [∀ a, DecidableEq (N a)] [∀ a, Zero (N a)] (f g : Π₀...
Mathlib/Data/DFinsupp/NeLocus.lean
67
68
theorem neLocus_comm : f.neLocus g = g.neLocus f := by
simp_rw [neLocus, Finset.union_comm, ne_comm]
import Mathlib.Algebra.MonoidAlgebra.Support import Mathlib.Algebra.Polynomial.Basic import Mathlib.Algebra.Regular.Basic import Mathlib.Data.Nat.Choose.Sum #align_import data.polynomial.coeff from "leanprover-community/mathlib"@"2651125b48fc5c170ab1111afd0817c903b1fc6c" set_option linter.uppercaseLean3 false no...
Mathlib/Algebra/Polynomial/Coeff.lean
298
299
theorem coeff_X_mul (p : R[X]) (n : ℕ) : coeff (X * p) (n + 1) = coeff p n := by
rw [(commute_X p).eq, coeff_mul_X]
import Mathlib.Analysis.InnerProductSpace.Adjoint #align_import analysis.inner_product_space.positive from "leanprover-community/mathlib"@"caa58cbf5bfb7f81ccbaca4e8b8ac4bc2b39cc1c" open InnerProductSpace RCLike ContinuousLinearMap open scoped InnerProduct ComplexConjugate namespace ContinuousLinearMap variable...
Mathlib/Analysis/InnerProductSpace/Positive.lean
119
123
theorem isPositive_iff_complex (T : E' →L[ℂ] E') : IsPositive T ↔ ∀ x, (re ⟪T x, x⟫_ℂ : ℂ) = ⟪T x, x⟫_ℂ ∧ 0 ≤ re ⟪T x, x⟫_ℂ := by
simp_rw [IsPositive, forall_and, isSelfAdjoint_iff_isSymmetric, LinearMap.isSymmetric_iff_inner_map_self_real, conj_eq_iff_re] rfl
import Mathlib.Algebra.GroupWithZero.Divisibility import Mathlib.Algebra.Order.Group.Int import Mathlib.Algebra.Order.Ring.Nat import Mathlib.Algebra.Ring.Rat import Mathlib.Data.PNat.Defs #align_import data.rat.lemmas from "leanprover-community/mathlib"@"550b58538991c8977703fdeb7c9d51a5aa27df11" namespace Rat o...
Mathlib/Data/Rat/Lemmas.lean
237
241
theorem inv_intCast_num_of_pos {a : ℤ} (ha0 : 0 < a) : (a : ℚ)⁻¹.num = 1 := by
rw [← ofInt_eq_cast, ofInt, mk_eq_divInt, Rat.inv_divInt', divInt_eq_div, Nat.cast_one] apply num_div_eq_of_coprime ha0 rw [Int.natAbs_one] exact Nat.coprime_one_left _
import Mathlib.Logic.Nonempty import Mathlib.Init.Set import Mathlib.Logic.Basic #align_import logic.function.basic from "leanprover-community/mathlib"@"29cb56a7b35f72758b05a30490e1f10bd62c35c1" open Function universe u v w namespace Function section variable {α β γ : Sort*} {f : α → β} @[reducible, simp] de...
Mathlib/Logic/Function/Basic.lean
109
110
theorem not_injective_iff : ¬ Injective f ↔ ∃ a b, f a = f b ∧ a ≠ b := by
simp only [Injective, not_forall, exists_prop]
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
699
702
theorem exists_retraction_of_isClosed {s : Set (∀ n, E n)} (hs : IsClosed s) (hne : s.Nonempty) : ∃ f : (∀ n, E n) → ∀ n, E n, (∀ x ∈ s, f x = x) ∧ range f = s ∧ Continuous f := by
rcases exists_lipschitz_retraction_of_isClosed hs hne with ⟨f, fs, frange, hf⟩ exact ⟨f, fs, frange, hf.continuous⟩
import Mathlib.MeasureTheory.Measure.Dirac set_option autoImplicit true open Set open scoped ENNReal Classical variable [MeasurableSpace α] [MeasurableSpace β] {s : Set α} noncomputable section namespace MeasureTheory.Measure def count : Measure α := sum dirac #align measure_theory.measure.count MeasureTheo...
Mathlib/MeasureTheory/Measure/Count.lean
92
96
theorem count_apply_eq_top [MeasurableSingletonClass α] : count s = ∞ ↔ s.Infinite := by
by_cases hs : s.Finite · exact count_apply_eq_top' hs.measurableSet · change s.Infinite at hs simp [hs, count_apply_infinite]
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
417
420
theorem det_fromBlocks_one₂₂ (A : Matrix m m α) (B : Matrix m n α) (C : Matrix n m α) : (Matrix.fromBlocks A B C 1).det = det (A - B * C) := by
haveI : Invertible (1 : Matrix n n α) := invertibleOne rw [det_fromBlocks₂₂, invOf_one, Matrix.mul_one, det_one, one_mul]
import Mathlib.NumberTheory.Cyclotomic.PrimitiveRoots import Mathlib.NumberTheory.NumberField.Discriminant #align_import number_theory.cyclotomic.discriminant from "leanprover-community/mathlib"@"3e068ece210655b7b9a9477c3aff38a492400aa1" universe u v open Algebra Polynomial Nat IsPrimitiveRoot PowerBasis open s...
Mathlib/NumberTheory/Cyclotomic/Discriminant.lean
62
122
theorem discr_prime_pow_ne_two [IsCyclotomicExtension {p ^ (k + 1)} K L] [hp : Fact (p : ℕ).Prime] (hζ : IsPrimitiveRoot ζ ↑(p ^ (k + 1))) (hirr : Irreducible (cyclotomic (↑(p ^ (k + 1)) : ℕ) K)) (hk : p ^ (k + 1) ≠ 2) : discr K (hζ.powerBasis K).basis = (-1) ^ ((p ^ (k + 1) : ℕ).totient / 2) * p ^ ((p : ...
haveI hne := IsCyclotomicExtension.neZero' (p ^ (k + 1)) K L -- Porting note: these two instances are not automatically synthesised and must be constructed haveI mf : Module.Finite K L := finiteDimensional {p ^ (k + 1)} K L haveI se : IsSeparable K L := (isGalois (p ^ (k + 1)) K L).to_isSeparable rw [discr_p...
import Mathlib.Order.BooleanAlgebra import Mathlib.Logic.Equiv.Basic #align_import order.symm_diff from "leanprover-community/mathlib"@"6eb334bd8f3433d5b08ba156b8ec3e6af47e1904" open Function OrderDual variable {ι α β : Type*} {π : ι → Type*} def symmDiff [Sup α] [SDiff α] (a b : α) : α := a \ b ⊔ b \ a #ali...
Mathlib/Order/SymmDiff.lean
165
166
theorem symmDiff_sdiff : a ∆ b \ c = a \ (b ⊔ c) ⊔ b \ (a ⊔ c) := by
rw [symmDiff, sup_sdiff_distrib, sdiff_sdiff_left, sdiff_sdiff_left]
import Mathlib.Analysis.Normed.Field.Basic import Mathlib.RingTheory.Valuation.RankOne import Mathlib.Topology.Algebra.Valuation noncomputable section open Filter Set Valuation open scoped NNReal variable {K : Type*} [hK : NormedField K] (h : IsNonarchimedean (norm : K → ℝ)) namespace Valued variable {L : Typ...
Mathlib/Topology/Algebra/NormedValued.lean
68
68
theorem norm_nonneg (x : L) : 0 ≤ norm x := by
simp only [norm, NNReal.zero_le_coe]
import Mathlib.CategoryTheory.Limits.Types import Mathlib.CategoryTheory.IsConnected import Mathlib.CategoryTheory.Limits.Final import Mathlib.CategoryTheory.Conj universe w v u namespace CategoryTheory.Limits.Types variable (C : Type u) [Category.{v} C] def constPUnitFunctor : C ⥤ Type w := (Functor.const C).o...
Mathlib/CategoryTheory/Limits/IsConnected.lean
118
123
theorem isConnected_iff_of_final (F : C ⥤ D) [CategoryTheory.Functor.Final F] : IsConnected C ↔ IsConnected D := by
rw [isConnected_iff_colimit_constPUnitFunctor_iso_pUnit.{max v u v₂ u₂} C, isConnected_iff_colimit_constPUnitFunctor_iso_pUnit.{max v u v₂ u₂} D] exact Equiv.nonempty_congr <| Iso.isoCongrLeft <| CategoryTheory.Functor.Final.colimitIso F <| constPUnitFunctor.{max u v u₂ v₂} D
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
197
208
theorem order_mul_ge (φ ψ : R⟦X⟧) : order φ + order ψ ≤ order (φ * ψ) := by
apply le_order intro n hn; rw [coeff_mul, Finset.sum_eq_zero] rintro ⟨i, j⟩ hij by_cases hi : ↑i < order φ · rw [coeff_of_lt_order i hi, zero_mul] by_cases hj : ↑j < order ψ · rw [coeff_of_lt_order j hj, mul_zero] rw [not_lt] at hi hj; rw [mem_antidiagonal] at hij exfalso apply ne_of_lt (lt_of_lt_o...
import Mathlib.MeasureTheory.Function.SimpleFunc import Mathlib.MeasureTheory.Constructions.BorelSpace.Metrizable #align_import measure_theory.function.simple_func_dense from "leanprover-community/mathlib"@"7317149f12f55affbc900fc873d0d422485122b9" open Set Function Filter TopologicalSpace ENNReal EMetric Finset ...
Mathlib/MeasureTheory/Function/SimpleFuncDense.lean
95
99
theorem nearestPtInd_le (e : ℕ → α) (N : ℕ) (x : α) : nearestPtInd e N x ≤ N := by
induction' N with N ihN; · simp simp only [nearestPtInd_succ] split_ifs exacts [le_rfl, ihN.trans N.le_succ]
import Mathlib.Init.ZeroOne import Mathlib.Data.Set.Defs import Mathlib.Order.Basic import Mathlib.Order.SymmDiff import Mathlib.Tactic.Tauto import Mathlib.Tactic.ByContra import Mathlib.Util.Delaborators #align_import data.set.basic from "leanprover-community/mathlib"@"001ffdc42920050657fd45bd2b8bfbec8eaaeb29" ...
Mathlib/Data/Set/Basic.lean
2,028
2,031
theorem insert_diff_singleton_comm (hab : a ≠ b) (s : Set α) : insert a (s \ {b}) = insert a s \ {b} := by
simp_rw [← union_singleton, union_diff_distrib, diff_singleton_eq_self (mem_singleton_iff.not.2 hab.symm)]
import Mathlib.Topology.Algebra.Module.WeakDual import Mathlib.MeasureTheory.Integral.BoundedContinuousFunction import Mathlib.MeasureTheory.Measure.HasOuterApproxClosed #align_import measure_theory.measure.finite_measure from "leanprover-community/mathlib"@"f2ce6086713c78a7f880485f7917ea547a215982" noncomputable...
Mathlib/MeasureTheory/Measure/FiniteMeasure.lean
282
284
theorem smul_apply [IsScalarTower R ℝ≥0 ℝ≥0] (c : R) (μ : FiniteMeasure Ω) (s : Set Ω) : (c • μ) s = c • μ s := by
rw [coeFn_smul, Pi.smul_apply]
import Mathlib.SetTheory.Cardinal.Finite #align_import data.finite.card from "leanprover-community/mathlib"@"3ff3f2d6a3118b8711063de7111a0d77a53219a8" noncomputable section open scoped Classical variable {α β γ : Type*} def Finite.equivFin (α : Type*) [Finite α] : α ≃ Fin (Nat.card α) := by have := (Finite....
Mathlib/Data/Finite/Card.lean
185
188
theorem card_subtype_lt [Finite α] {p : α → Prop} {x : α} (hx : ¬p x) : Nat.card { x // p x } < Nat.card α := by
haveI := Fintype.ofFinite α simpa only [Nat.card_eq_fintype_card, gt_iff_lt] using Fintype.card_subtype_lt hx
import Mathlib.Algebra.Field.Basic import Mathlib.Algebra.GroupWithZero.Units.Equiv import Mathlib.Algebra.Order.Field.Defs import Mathlib.Algebra.Order.Ring.Abs import Mathlib.Order.Bounds.OrderIso import Mathlib.Tactic.Positivity.Core #align_import algebra.order.field.basic from "leanprover-community/mathlib"@"8477...
Mathlib/Algebra/Order/Field/Basic.lean
235
236
theorem inv_le_one (ha : 1 ≤ a) : a⁻¹ ≤ 1 := by
rwa [inv_le (zero_lt_one.trans_le ha) zero_lt_one, inv_one]
import Mathlib.Combinatorics.SimpleGraph.Subgraph import Mathlib.Data.List.Rotate #align_import combinatorics.simple_graph.connectivity from "leanprover-community/mathlib"@"b99e2d58a5e6861833fa8de11e51a81144258db4" open Function universe u v w namespace SimpleGraph variable {V : Type u} {V' : Type v} {V'' : Typ...
Mathlib/Combinatorics/SimpleGraph/Connectivity.lean
810
812
theorem dart_snd_mem_support_of_mem_darts {u v : V} (p : G.Walk u v) {d : G.Dart} (h : d ∈ p.darts) : d.snd ∈ p.support := by
simpa using p.reverse.dart_fst_mem_support_of_mem_darts (by simp [h] : d.symm ∈ p.reverse.darts)
import Mathlib.Combinatorics.SimpleGraph.Clique import Mathlib.Data.ENat.Lattice import Mathlib.Data.Nat.Lattice import Mathlib.Data.Setoid.Partition import Mathlib.Order.Antichain #align_import combinatorics.simple_graph.coloring from "leanprover-community/mathlib"@"70fd9563a21e7b963887c9360bd29b2393e6225a" open ...
Mathlib/Combinatorics/SimpleGraph/Coloring.lean
415
417
theorem chromaticNumber_bot [Nonempty V] : (⊥ : SimpleGraph V).chromaticNumber = 1 := by
have : (⊥ : SimpleGraph V).Colorable 1 := ⟨.mk 0 $ by simp⟩ exact this.chromaticNumber_le.antisymm $ ENat.one_le_iff_pos.2 $ chromaticNumber_pos this
import Mathlib.Analysis.InnerProductSpace.Spectrum import Mathlib.Data.Matrix.Rank import Mathlib.LinearAlgebra.Matrix.Diagonal import Mathlib.LinearAlgebra.Matrix.Hermitian #align_import linear_algebra.matrix.spectrum from "leanprover-community/mathlib"@"46b633fd842bef9469441c0209906f6dddd2b4f5" namespace Matrix ...
Mathlib/LinearAlgebra/Matrix/Spectrum.lean
87
100
theorem star_mul_self_mul_eq_diagonal : (star (eigenvectorUnitary hA : Matrix n n 𝕜)) * A * (eigenvectorUnitary hA : Matrix n n 𝕜) = diagonal (RCLike.ofReal ∘ hA.eigenvalues) := by
apply Matrix.toEuclideanLin.injective apply Basis.ext (EuclideanSpace.basisFun n 𝕜).toBasis intro i simp only [toEuclideanLin_apply, OrthonormalBasis.coe_toBasis, EuclideanSpace.basisFun_apply, WithLp.equiv_single, ← mulVec_mulVec, eigenvectorUnitary_mulVec, ← mulVec_mulVec, mulVec_eigenvectorBasis, M...
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
382
384
theorem mk_initialSeg (o : Ordinal.{u}) : #{ o' : Ordinal | o' < o } = Cardinal.lift.{u + 1} o.card := by
rw [lift_card, ← type_subrel_lt, card_type]
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
960
961
theorem diam_pair : diam ({x, y} : Set α) = edist x y := by
simp only [iSup_singleton, diam_insert, diam_singleton, ENNReal.max_zero_right]
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
132
134
theorem prod_union : s ×ˢ (t₁ ∪ t₂) = s ×ˢ t₁ ∪ s ×ˢ t₂ := by
ext ⟨x, y⟩ simp [and_or_left]
import Mathlib.Topology.Order.LocalExtr import Mathlib.Topology.Order.IntermediateValue import Mathlib.Topology.Support import Mathlib.Topology.Order.IsLUB #align_import topology.algebra.order.compact from "leanprover-community/mathlib"@"3efd324a3a31eaa40c9d5bfc669c4fafee5f9423" open Filter OrderDual TopologicalSp...
Mathlib/Topology/Algebra/Order/Compact.lean
227
238
theorem atBot_le_cocompact [NoMinOrder α] [ClosedIicTopology α] : atBot ≤ cocompact α := by
refine fun s hs ↦ ?_ obtain ⟨t, ht, hts⟩ := mem_cocompact.mp hs refine (Set.eq_empty_or_nonempty t).casesOn (fun h_empty ↦ ?_) (fun h_nonempty ↦ ?_) · rewrite [compl_univ_iff.mpr h_empty, univ_subset_iff] at hts convert univ_mem · haveI := h_nonempty.nonempty obtain ⟨a, ha⟩ := ht.exists_isLeast h_non...
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
136
137
theorem map_eq_zero_iff (h : IsAdjoinRoot S f) {p} : h.map p = 0 ↔ f ∣ p := by
rw [← h.mem_ker_map, RingHom.mem_ker]
import Mathlib.LinearAlgebra.FiniteDimensional import Mathlib.MeasureTheory.Group.Pointwise import Mathlib.MeasureTheory.Measure.Lebesgue.Basic import Mathlib.MeasureTheory.Measure.Haar.Basic import Mathlib.MeasureTheory.Measure.Doubling import Mathlib.MeasureTheory.Constructions.BorelSpace.Metric #align_import measu...
Mathlib/MeasureTheory/Measure/Lebesgue/EqHaar.lean
402
404
theorem addHaar_smul_of_nonneg {r : ℝ} (hr : 0 ≤ r) (s : Set E) : μ (r • s) = ENNReal.ofReal (r ^ finrank ℝ E) * μ s := by
rw [addHaar_smul, abs_pow, abs_of_nonneg hr]
import Mathlib.Data.Nat.Choose.Basic import Mathlib.Data.Sym.Sym2 namespace List variable {α : Type*} section Sym2 protected def sym2 : List α → List (Sym2 α) | [] => [] | x :: xs => (x :: xs).map (fun y => s(x, y)) ++ xs.sym2 theorem mem_sym2_cons_iff {x : α} {xs : List α} {z : Sym2 α} : z ∈ (x :: xs)...
Mathlib/Data/List/Sym.lean
63
66
theorem right_mem_of_mk_mem_sym2 {xs : List α} {a b : α} (h : s(a, b) ∈ xs.sym2) : b ∈ xs := by
rw [Sym2.eq_swap] at h exact left_mem_of_mk_mem_sym2 h
import Mathlib.Algebra.Category.GroupCat.Basic import Mathlib.Algebra.Category.MonCat.FilteredColimits #align_import algebra.category.Group.filtered_colimits from "leanprover-community/mathlib"@"c43486ecf2a5a17479a32ce09e4818924145e90e" set_option linter.uppercaseLean3 false universe v u noncomputable section o...
Mathlib/Algebra/Category/GroupCat/FilteredColimits.lean
84
91
theorem colimitInvAux_eq_of_rel (x y : Σ j, F.obj j) (h : Types.FilteredColimit.Rel (F ⋙ forget GroupCat) x y) : colimitInvAux.{v, u} F x = colimitInvAux F y := by
apply G.mk_eq obtain ⟨k, f, g, hfg⟩ := h use k, f, g rw [MonoidHom.map_inv, MonoidHom.map_inv, inv_inj] exact hfg
import Mathlib.Analysis.SpecialFunctions.Exp import Mathlib.Data.Nat.Factorization.Basic import Mathlib.Analysis.NormedSpace.Real #align_import analysis.special_functions.log.basic from "leanprover-community/mathlib"@"f23a09ce6d3f367220dc3cecad6b7eb69eb01690" open Set Filter Function open Topology noncomputable ...
Mathlib/Analysis/SpecialFunctions/Log/Basic.lean
49
52
theorem log_of_pos (hx : 0 < x) : log x = expOrderIso.symm ⟨x, hx⟩ := by
rw [log_of_ne_zero hx.ne'] congr exact abs_of_pos hx
import Mathlib.Algebra.Order.Ring.Rat import Mathlib.Tactic.NormNum.Inv import Mathlib.Tactic.NormNum.Pow import Mathlib.Util.AtomM set_option autoImplicit true namespace Mathlib.Tactic namespace Ring open Mathlib.Meta Qq NormNum Lean.Meta AtomM open Lean (MetaM Expr mkRawNatLit) def instCommSemiringNat : CommSe...
Mathlib/Tactic/Ring/Basic.lean
977
978
theorem pow_congr (_ : a = a') (_ : b = b') (_ : a' ^ b' = c) : (a ^ b : R) = c := by
subst_vars; rfl
import Mathlib.NumberTheory.Zsqrtd.GaussianInt import Mathlib.NumberTheory.LegendreSymbol.Basic import Mathlib.Analysis.Normed.Field.Basic #align_import number_theory.zsqrtd.quadratic_reciprocity from "leanprover-community/mathlib"@"5b2fe80501ff327b9109fb09b7cc8c325cd0d7d9" open Zsqrtd Complex open scoped Comple...
Mathlib/NumberTheory/Zsqrtd/QuadraticReciprocity.lean
33
83
theorem mod_four_eq_three_of_nat_prime_of_prime (p : ℕ) [hp : Fact p.Prime] (hpi : Prime (p : ℤ[i])) : p % 4 = 3 := hp.1.eq_two_or_odd.elim (fun hp2 => absurd hpi (mt irreducible_iff_prime.2 fun ⟨_, h⟩ => by have := h ⟨1, 1⟩ ⟨1, -1⟩ (hp2.symm ▸ rfl) rw [← norm_eq_one_iff, ← n...
rw [← Nat.mod_mul_left_mod p 2 2, show 2 * 2 = 4 from rfl] at hp1 have := Nat.mod_lt p (show 0 < 4 by decide) revert this hp3 hp1 generalize p % 4 = m intros; interval_cases m <;> simp_all -- Porting note (#11043): was `decide!` let ⟨k, hk⟩ := (ZMod.exists_sq_eq_neg_one_if...
import Mathlib.Algebra.Module.Zlattice.Basic import Mathlib.NumberTheory.NumberField.Embeddings import Mathlib.NumberTheory.NumberField.FractionalIdeal #align_import number_theory.number_field.canonical_embedding from "leanprover-community/mathlib"@"60da01b41bbe4206f05d34fd70c8dd7498717a30" variable (K : Type*) [F...
Mathlib/NumberTheory/NumberField/CanonicalEmbedding/Basic.lean
269
272
theorem normAtPlace_add_le (w : InfinitePlace K) (x y : E K) : normAtPlace w (x + y) ≤ normAtPlace w x + normAtPlace w y := by
rw [normAtPlace, MonoidWithZeroHom.coe_mk, ZeroHom.coe_mk] split_ifs <;> exact norm_add_le _ _
import Mathlib.Topology.Connected.Basic import Mathlib.Topology.Separation open scoped Topology variable {X Y A} [TopologicalSpace X] [TopologicalSpace A] theorem embedding_toPullbackDiag (f : X → Y) : Embedding (toPullbackDiag f) := Embedding.mk' _ (injective_toPullbackDiag f) fun x ↦ by rw [toPullbackDiag,...
Mathlib/Topology/SeparatedMap.lean
101
106
theorem IsSeparatedMap.pullback {f : X → Y} (sep : IsSeparatedMap f) (g : A → Y) : IsSeparatedMap (@snd X Y A f g) := by
rw [isSeparatedMap_iff_isClosed_diagonal] at sep ⊢ rw [← preimage_map_fst_pullbackDiagonal] refine sep.preimage (Continuous.mapPullback ?_ ?_) <;> apply_rules [continuous_fst, continuous_subtype_val, Continuous.comp]
import Mathlib.Topology.Defs.Induced import Mathlib.Topology.Basic #align_import topology.order from "leanprover-community/mathlib"@"bcfa726826abd57587355b4b5b7e78ad6527b7e4" open Function Set Filter Topology universe u v w namespace TopologicalSpace variable {α : Type u} inductive GenerateOpen (g : Set (Set ...
Mathlib/Topology/Order.lean
78
90
theorem nhds_generateFrom {g : Set (Set α)} {a : α} : @nhds α (generateFrom g) a = ⨅ s ∈ { s | a ∈ s ∧ s ∈ g }, 𝓟 s := by
letI := generateFrom g rw [nhds_def] refine le_antisymm (biInf_mono fun s ⟨as, sg⟩ => ⟨as, .basic _ sg⟩) <| le_iInf₂ ?_ rintro s ⟨ha, hs⟩ induction hs with | basic _ hs => exact iInf₂_le _ ⟨ha, hs⟩ | univ => exact le_top.trans_eq principal_univ.symm | inter _ _ _ _ hs ht => exact (le_inf (hs ha.1) (ht ...
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
210
212
theorem nhdsWithin_eq_nhdsWithin {a : α} {s t u : Set α} (h₀ : a ∈ s) (h₁ : IsOpen s) (h₂ : t ∩ s = u ∩ s) : 𝓝[t] a = 𝓝[u] a := by
rw [nhdsWithin_restrict t h₀ h₁, nhdsWithin_restrict u h₀ h₁, h₂]
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
314
344
theorem mem_generatePiSystem_iUnion_elim' {α β} {g : β → Set (Set α)} {s : Set β} (h_pi : ∀ b ∈ s, IsPiSystem (g b)) (t : Set α) (h_t : t ∈ generatePiSystem (⋃ b ∈ s, g b)) : ∃ (T : Finset β) (f : β → Set α), ↑T ⊆ s ∧ (t = ⋂ b ∈ T, f b) ∧ ∀ b ∈ T, f b ∈ g b := by
have : t ∈ generatePiSystem (⋃ b : Subtype s, (g ∘ Subtype.val) b) := by suffices h1 : ⋃ b : Subtype s, (g ∘ Subtype.val) b = ⋃ b ∈ s, g b by rwa [h1] ext x simp only [exists_prop, Set.mem_iUnion, Function.comp_apply, Subtype.exists, Subtype.coe_mk] rfl rcases @mem_generatePiSystem_iUnion_elim α (S...
import Mathlib.Algebra.Polynomial.Derivative import Mathlib.Tactic.LinearCombination #align_import ring_theory.polynomial.chebyshev from "leanprover-community/mathlib"@"d774451114d6045faeb6751c396bea1eb9058946" namespace Polynomial.Chebyshev set_option linter.uppercaseLean3 false -- `T` `U` `X` open Polynomial v...
Mathlib/RingTheory/Polynomial/Chebyshev.lean
184
185
theorem U_neg_two : U R (-2) = -1 := by
simpa [zero_sub, Int.reduceNeg, U_neg_one, mul_zero, U_zero] using U_sub_two R 0
import Mathlib.Data.ZMod.Quotient #align_import group_theory.complement from "leanprover-community/mathlib"@"6ca1a09bc9aa75824bf97388c9e3b441fc4ccf3f" open Set open scoped Pointwise namespace Subgroup variable {G : Type*} [Group G] (H K : Subgroup G) (S T : Set G) @[to_additive "`S` and `T` are complements if ...
Mathlib/GroupTheory/Complement.lean
441
445
theorem equiv_fst_eq_self_of_mem_of_one_mem {g : G} (h1 : 1 ∈ T) (hg : g ∈ S) : (hST.equiv g).fst = ⟨g, hg⟩ := by
have : hST.equiv.symm (⟨g, hg⟩, ⟨1, h1⟩) = g := by rw [equiv, Equiv.ofBijective]; simp conv_lhs => rw [← this, Equiv.apply_symm_apply]
import Mathlib.Algebra.Field.Basic import Mathlib.Algebra.GroupWithZero.Units.Equiv import Mathlib.Algebra.Order.Field.Defs import Mathlib.Algebra.Order.Ring.Abs import Mathlib.Order.Bounds.OrderIso import Mathlib.Tactic.Positivity.Core #align_import algebra.order.field.basic from "leanprover-community/mathlib"@"8477...
Mathlib/Algebra/Order/Field/Basic.lean
367
367
theorem div_le_one (hb : 0 < b) : a / b ≤ 1 ↔ a ≤ b := by
rw [div_le_iff hb, one_mul]
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
131
134
theorem prod_ite_eq' [DecidableEq α] (f : α →₀ M) (a : α) (b : α → M → N) : (f.prod fun x v => ite (x = a) (b x v) 1) = ite (a ∈ f.support) (b a (f a)) 1 := by
dsimp [Finsupp.prod] rw [f.support.prod_ite_eq']
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
453
464
theorem coeff_X_pow_mul (p : R⟦X⟧) (n d : ℕ) : coeff R (d + n) (X ^ n * p) = coeff R d p := by
rw [coeff_mul, Finset.sum_eq_single (n, d), coeff_X_pow, if_pos rfl, one_mul] · rintro ⟨i, j⟩ h1 h2 rw [coeff_X_pow, if_neg, zero_mul] rintro rfl apply h2 rw [mem_antidiagonal, add_comm, add_right_cancel_iff] at h1 subst h1 rfl · rw [add_comm] exact fun h1 => (h1 (mem_antidiagonal.2 r...
import Mathlib.MeasureTheory.Measure.ProbabilityMeasure import Mathlib.MeasureTheory.Measure.Lebesgue.Basic import Mathlib.MeasureTheory.Integral.Layercake import Mathlib.MeasureTheory.Integral.BoundedContinuousFunction #align_import measure_theory.measure.portmanteau from "leanprover-community/mathlib"@"fd5edc43dc4f...
Mathlib/MeasureTheory/Measure/Portmanteau.lean
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theorem FiniteMeasure.limsup_measure_closed_le_of_tendsto {Ω ι : Type*} {L : Filter ι} [MeasurableSpace Ω] [TopologicalSpace Ω] [HasOuterApproxClosed Ω] [OpensMeasurableSpace Ω] {μ : FiniteMeasure Ω} {μs : ι → FiniteMeasure Ω} (μs_lim : Tendsto μs L (𝓝 μ)) {F : Set Ω} (F_closed : IsClosed F) : (L.limsu...
rcases L.eq_or_neBot with rfl | hne · simp only [limsup_bot, bot_le] apply ENNReal.le_of_forall_pos_le_add intro ε ε_pos _ let fs := F_closed.apprSeq have key₁ : Tendsto (fun n ↦ ∫⁻ ω, (fs n ω : ℝ≥0∞) ∂μ) atTop (𝓝 ((μ : Measure Ω) F)) := HasOuterApproxClosed.tendsto_lintegral_apprSeq F_closed (μ : Me...
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
144
155
theorem fold_ite' {g : α → β} (hb : op b b = b) (p : α → Prop) [DecidablePred p] : Finset.fold op b (fun i => ite (p i) (f i) (g i)) s = op (Finset.fold op b f (s.filter p)) (Finset.fold op b g (s.filter fun i => ¬p i)) := by
classical induction' s using Finset.induction_on with x s hx IH · simp [hb] · simp only [Finset.fold_insert hx] split_ifs with h · have : x ∉ Finset.filter p s := by simp [hx] simp [Finset.filter_insert, h, Finset.fold_insert this, ha.assoc, IH] · have : x ∉ Finset.filter (fun i...