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import Mathlib.Algebra.Polynomial.UnitTrinomial import Mathlib.RingTheory.Polynomial.GaussLemma import Mathlib.Tactic.LinearCombination #align_import ring_theory.polynomial.selmer from "leanprover-community/mathlib"@"3e00d81bdcbf77c8188bbd18f5524ddc3ed8cac6" namespace Polynomial open scoped Polynomial variable ...
Mathlib/RingTheory/Polynomial/Selmer.lean
71
82
theorem X_pow_sub_X_sub_one_irreducible_rat (hn1 : n ≠ 1) : Irreducible (X ^ n - X - 1 : ℚ[X]) := by
by_cases hn0 : n = 0 · rw [hn0, pow_zero, sub_sub, add_comm, ← sub_sub, sub_self, zero_sub] exact Associated.irreducible ⟨-1, mul_neg_one X⟩ irreducible_X have hp : (X ^ n - X - 1 : ℤ[X]) = trinomial 0 1 n (-1) (-1) 1 := by simp only [trinomial, C_neg, C_1]; ring have hn : 1 < n := Nat.one_lt_iff_ne_ze...
import Mathlib.CategoryTheory.EqToHom import Mathlib.CategoryTheory.Quotient import Mathlib.Combinatorics.Quiver.Path #align_import category_theory.path_category from "leanprover-community/mathlib"@"c6dd521ebdce53bb372c527569dd7c25de53a08b" universe v₁ v₂ u₁ u₂ namespace CategoryTheory section def Paths (V : ...
Mathlib/CategoryTheory/PathCategory.lean
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theorem ext_functor {C} [Category C] {F G : Paths V ⥤ C} (h_obj : F.obj = G.obj) (h : ∀ (a b : V) (e : a ⟶ b), F.map e.toPath = eqToHom (congr_fun h_obj a) ≫ G.map e.toPath ≫ eqToHom (congr_fun h_obj.symm b)) : F = G := by
fapply Functor.ext · intro X rw [h_obj] · intro X Y f induction' f with Y' Z' g e ih · erw [F.map_id, G.map_id, Category.id_comp, eqToHom_trans, eqToHom_refl] · erw [F.map_comp g (Quiver.Hom.toPath e), G.map_comp g (Quiver.Hom.toPath e), ih, h] simp only [Category.id_comp, eqToHom_refl, eqT...
import Mathlib.Control.Applicative import Mathlib.Control.Traversable.Basic #align_import control.traversable.lemmas from "leanprover-community/mathlib"@"3342d1b2178381196f818146ff79bc0e7ccd9e2d" universe u open LawfulTraversable open Function hiding comp open Functor attribute [functor_norm] LawfulTraversabl...
Mathlib/Control/Traversable/Lemmas.lean
93
95
theorem comp_sequence (x : t (F (G α))) : sequence (Comp.mk <$> x) = Comp.mk (sequence <$> sequence x) := by
simp only [sequence, traverse_map, id_comp]; rw [← comp_traverse]; simp [map_id]
import Batteries.Data.List.Lemmas import Batteries.Data.Array.Basic import Batteries.Tactic.SeqFocus import Batteries.Util.ProofWanted namespace Array theorem forIn_eq_data_forIn [Monad m] (as : Array α) (b : β) (f : α → β → m (ForInStep β)) : forIn as b f = forIn as.data b f := by let rec loop : ∀ {i h b ...
.lake/packages/batteries/Batteries/Data/Array/Lemmas.lean
106
113
theorem mem_join : ∀ {L : Array (Array α)}, a ∈ L.join ↔ ∃ l, l ∈ L ∧ a ∈ l := by
simp only [mem_def, join_data, List.mem_join, List.mem_map] intro l constructor · rintro ⟨_, ⟨s, m, rfl⟩, h⟩ exact ⟨s, m, h⟩ · rintro ⟨s, h₁, h₂⟩ refine ⟨s.data, ⟨⟨s, h₁, rfl⟩, h₂⟩⟩
import Mathlib.Algebra.Order.Ring.Abs #align_import data.int.order.units from "leanprover-community/mathlib"@"d012cd09a9b256d870751284dd6a29882b0be105" namespace Int theorem isUnit_iff_abs_eq {x : ℤ} : IsUnit x ↔ abs x = 1 := by rw [isUnit_iff_natAbs_eq, abs_eq_natAbs, ← Int.ofNat_one, natCast_inj] #align int....
Mathlib/Data/Int/Order/Units.lean
63
67
theorem units_pow_eq_pow_mod_two (u : ℤˣ) (n : ℕ) : u ^ n = u ^ (n % 2) := by
conv => lhs rw [← Nat.mod_add_div n 2]; rw [pow_add, pow_mul, units_sq, one_pow, mul_one]
import Mathlib.Algebra.MvPolynomial.PDeriv import Mathlib.Algebra.Polynomial.AlgebraMap import Mathlib.Algebra.Polynomial.Derivative import Mathlib.Data.Nat.Choose.Sum import Mathlib.LinearAlgebra.LinearIndependent import Mathlib.RingTheory.Polynomial.Pochhammer #align_import ring_theory.polynomial.bernstein from "le...
Mathlib/RingTheory/Polynomial/Bernstein.lean
102
131
theorem derivative_succ_aux (n ν : ℕ) : Polynomial.derivative (bernsteinPolynomial R (n + 1) (ν + 1)) = (n + 1) * (bernsteinPolynomial R n ν - bernsteinPolynomial R n (ν + 1)) := by
rw [bernsteinPolynomial] suffices ((n + 1).choose (ν + 1) : R[X]) * ((↑(ν + 1 : ℕ) : R[X]) * X ^ ν) * (1 - X) ^ (n - ν) - ((n + 1).choose (ν + 1) : R[X]) * X ^ (ν + 1) * ((↑(n - ν) : R[X]) * (1 - X) ^ (n - ν - 1)) = (↑(n + 1) : R[X]) * ((n.choose ν : R[X]) * X ^ ν * (1 - X) ^ (n - ν) - (n.choos...
import Mathlib.FieldTheory.Separable import Mathlib.RingTheory.IntegralDomain import Mathlib.Algebra.CharP.Reduced import Mathlib.Tactic.ApplyFun #align_import field_theory.finite.basic from "leanprover-community/mathlib"@"12a85fac627bea918960da036049d611b1a3ee43" variable {K : Type*} {R : Type*} local notation ...
Mathlib/FieldTheory/Finite/Basic.lean
142
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theorem sum_subgroup_units_eq_zero [Ring K] [NoZeroDivisors K] {G : Subgroup Kˣ} [Fintype G] (hg : G ≠ ⊥) : ∑ x : G, (x.val : K) = 0 := by
rw [Subgroup.ne_bot_iff_exists_ne_one] at hg rcases hg with ⟨a, ha⟩ -- The action of a on G as an embedding let a_mul_emb : G ↪ G := mulLeftEmbedding a -- ... and leaves G unchanged have h_unchanged : Finset.univ.map a_mul_emb = Finset.univ := by simp -- Therefore the sum of x over a G is the sum of a x ...
import Mathlib.MeasureTheory.Integral.Lebesgue open Set hiding restrict restrict_apply open Filter ENNReal NNReal MeasureTheory.Measure namespace MeasureTheory variable {α : Type*} {m0 : MeasurableSpace α} {μ : Measure α} noncomputable def Measure.withDensity {m : MeasurableSpace α} (μ : Measure α) (f : α → ℝ≥...
Mathlib/MeasureTheory/Measure/WithDensity.lean
110
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theorem withDensity_add_measure {m : MeasurableSpace α} (μ ν : Measure α) (f : α → ℝ≥0∞) : (μ + ν).withDensity f = μ.withDensity f + ν.withDensity f := by
ext1 s hs simp only [withDensity_apply f hs, restrict_add, lintegral_add_measure, Measure.add_apply]
import Mathlib.Algebra.Periodic import Mathlib.Data.Nat.Count import Mathlib.Data.Nat.GCD.Basic import Mathlib.Order.Interval.Finset.Nat #align_import data.nat.periodic from "leanprover-community/mathlib"@"dc6c365e751e34d100e80fe6e314c3c3e0fd2988" namespace Nat open Nat Function theorem periodic_gcd (a : ℕ) : P...
Mathlib/Data/Nat/Periodic.lean
33
34
theorem periodic_mod (a : ℕ) : Periodic (fun n => n % a) a := by
simp only [forall_const, eq_self_iff_true, add_mod_right, Periodic]
import Mathlib.Data.Set.Prod import Mathlib.Logic.Function.Conjugate #align_import data.set.function from "leanprover-community/mathlib"@"996b0ff959da753a555053a480f36e5f264d4207" variable {α β γ : Type*} {ι : Sort*} {π : α → Type*} open Equiv Equiv.Perm Function namespace Set section restrict def restrict (...
Mathlib/Data/Set/Function.lean
74
76
theorem image_restrict (f : α → β) (s t : Set α) : s.restrict f '' (Subtype.val ⁻¹' t) = f '' (t ∩ s) := by
rw [restrict_eq, image_comp, image_preimage_eq_inter_range, Subtype.range_coe]
import Mathlib.Analysis.Calculus.ContDiff.Bounds import Mathlib.Analysis.Calculus.IteratedDeriv.Defs import Mathlib.Analysis.Calculus.LineDeriv.Basic import Mathlib.Analysis.LocallyConvex.WithSeminorms import Mathlib.Analysis.Normed.Group.ZeroAtInfty import Mathlib.Analysis.SpecialFunctions.Pow.Real import Mathlib.Ana...
Mathlib/Analysis/Distribution/SchwartzSpace.lean
145
153
theorem isBigO_cocompact_zpow_neg_nat (k : ℕ) : f =O[cocompact E] fun x => ‖x‖ ^ (-k : ℤ) := by
obtain ⟨d, _, hd'⟩ := f.decay k 0 simp only [norm_iteratedFDeriv_zero] at hd' simp_rw [Asymptotics.IsBigO, Asymptotics.IsBigOWith] refine ⟨d, Filter.Eventually.filter_mono Filter.cocompact_le_cofinite ?_⟩ refine (Filter.eventually_cofinite_ne 0).mono fun x hx => ?_ rw [Real.norm_of_nonneg (zpow_nonneg (nor...
import Mathlib.Data.List.Chain import Mathlib.Data.List.Enum import Mathlib.Data.List.Nodup import Mathlib.Data.List.Pairwise import Mathlib.Data.List.Zip #align_import data.list.range from "leanprover-community/mathlib"@"7b78d1776212a91ecc94cf601f83bdcc46b04213" set_option autoImplicit true universe u open Nat...
Mathlib/Data/List/Range.lean
115
118
theorem chain_range_succ (r : ℕ → ℕ → Prop) (n a : ℕ) : Chain r a (range n.succ) ↔ r a 0 ∧ ∀ m < n, r m m.succ := by
rw [range_succ_eq_map, chain_cons, and_congr_right_iff, ← chain'_range_succ, range_succ_eq_map] exact fun _ => Iff.rfl
import Mathlib.Data.Nat.Choose.Basic import Mathlib.Data.Nat.Prime #align_import data.nat.choose.dvd from "leanprover-community/mathlib"@"966e0cf0685c9cedf8a3283ac69eef4d5f2eaca2" namespace Nat open Nat namespace Prime variable {p a b k : ℕ}
Mathlib/Data/Nat/Choose/Dvd.lean
24
29
theorem dvd_choose_add (hp : Prime p) (hap : a < p) (hbp : b < p) (h : p ≤ a + b) : p ∣ choose (a + b) a := by
have h₁ : p ∣ (a + b)! := hp.dvd_factorial.2 h rw [← add_choose_mul_factorial_mul_factorial, ← choose_symm_add, hp.dvd_mul, hp.dvd_mul, hp.dvd_factorial, hp.dvd_factorial] at h₁ exact (h₁.resolve_right hbp.not_le).resolve_right hap.not_le
import Mathlib.Geometry.Manifold.ContMDiff.Defs open Set Filter Function open scoped Topology Manifold variable {𝕜 : Type*} [NontriviallyNormedField 𝕜] -- declare a smooth manifold `M` over the pair `(E, H)`. {E : Type*} [NormedAddCommGroup E] [NormedSpace 𝕜 E] {H : Type*} [TopologicalSpace H] (I : Mode...
Mathlib/Geometry/Manifold/ContMDiff/Basic.lean
81
84
theorem ContMDiffWithinAt.comp_of_eq {t : Set M'} {g : M' → M''} {x : M} {y : M'} (hg : ContMDiffWithinAt I' I'' n g t y) (hf : ContMDiffWithinAt I I' n f s x) (st : MapsTo f s t) (hx : f x = y) : ContMDiffWithinAt I I'' n (g ∘ f) s x := by
subst hx; exact hg.comp x hf st
import Mathlib.NumberTheory.SmoothNumbers import Mathlib.Analysis.PSeries open Set Nat open scoped Topology -- This needs `Mathlib.Analysis.RCLike.Basic`, so we put it here -- instead of in `Mathlib.NumberTheory.SmoothNumbers`. lemma Nat.roughNumbersUpTo_card_le' (N k : ℕ) : (roughNumbersUpTo N k).card ≤ ...
Mathlib/NumberTheory/SumPrimeReciprocals.lean
82
83
theorem Nat.Primes.not_summable_one_div : ¬ Summable (fun p : Nat.Primes ↦ (1 / p : ℝ)) := by
convert summable_subtype_iff_indicator.mp.mt not_summable_one_div_on_primes
import Mathlib.Algebra.Group.Defs #align_import algebra.invertible from "leanprover-community/mathlib"@"722b3b152ddd5e0cf21c0a29787c76596cb6b422" assert_not_exists MonoidWithZero assert_not_exists DenselyOrdered universe u variable {α : Type u} class Invertible [Mul α] [One α] (a : α) : Type u where invOf...
Mathlib/Algebra/Group/Invertible/Defs.lean
141
142
theorem mul_mul_invOf_self_cancel' [Monoid α] (a b : α) {_ : Invertible b} : a * b * ⅟ b = a := by
simp [mul_assoc]
import Mathlib.Data.ENNReal.Operations #align_import data.real.ennreal from "leanprover-community/mathlib"@"c14c8fcde993801fca8946b0d80131a1a81d1520" open Set NNReal namespace ENNReal noncomputable section Inv variable {a b c d : ℝ≥0∞} {r p q : ℝ≥0} protected theorem div_eq_inv_mul : a / b = b⁻¹ * a := by rw [...
Mathlib/Data/ENNReal/Inv.lean
79
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theorem div_zero (h : a ≠ 0) : a / 0 = ∞ := by
simp [div_eq_mul_inv, h]
import Mathlib.Algebra.MonoidAlgebra.Division import Mathlib.Algebra.Polynomial.Degree.Definitions import Mathlib.Algebra.Polynomial.Induction import Mathlib.Algebra.Polynomial.EraseLead import Mathlib.Order.Interval.Finset.Nat #align_import data.polynomial.inductions from "leanprover-community/mathlib"@"57e09a1296bf...
Mathlib/Algebra/Polynomial/Inductions.lean
45
46
theorem coeff_divX : (divX p).coeff n = p.coeff (n + 1) := by
rw [add_comm]; cases p; rfl
import Mathlib.MeasureTheory.Measure.AEMeasurable #align_import dynamics.ergodic.measure_preserving from "leanprover-community/mathlib"@"92ca63f0fb391a9ca5f22d2409a6080e786d99f7" variable {α β γ δ : Type*} [MeasurableSpace α] [MeasurableSpace β] [MeasurableSpace γ] [MeasurableSpace δ] namespace MeasureTheory ...
Mathlib/Dynamics/Ergodic/MeasurePreserving.lean
92
94
theorem aemeasurable_comp_iff {f : α → β} (hf : MeasurePreserving f μa μb) (h₂ : MeasurableEmbedding f) {g : β → γ} : AEMeasurable (g ∘ f) μa ↔ AEMeasurable g μb := by
rw [← hf.map_eq, h₂.aemeasurable_map_iff]
import Mathlib.Geometry.RingedSpace.PresheafedSpace import Mathlib.CategoryTheory.Limits.Final import Mathlib.Topology.Sheaves.Stalks #align_import algebraic_geometry.stalks from "leanprover-community/mathlib"@"d39590fc8728fbf6743249802486f8c91ffe07bc" noncomputable section universe v u v' u' open Opposite Cate...
Mathlib/Geometry/RingedSpace/Stalks.lean
171
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theorem congr {X Y : PresheafedSpace.{_, _, v} C} (α β : X ⟶ Y) (h₁ : α = β) (x x' : X) (h₂ : x = x') : stalkMap α x ≫ eqToHom (show X.stalk x = X.stalk x' by rw [h₂]) = eqToHom (show Y.stalk (α.base x) = Y.stalk (β.base x') by rw [h₁, h₂]) ≫ stalkMap β x' := by
ext substs h₁ h₂ simp
import Mathlib.Analysis.SpecialFunctions.ExpDeriv #align_import analysis.ODE.gronwall from "leanprover-community/mathlib"@"f2ce6086713c78a7f880485f7917ea547a215982" variable {E : Type*} [NormedAddCommGroup E] [NormedSpace ℝ E] {F : Type*} [NormedAddCommGroup F] [NormedSpace ℝ F] open Metric Set Asymptotics Fil...
Mathlib/Analysis/ODE/Gronwall.lean
86
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theorem gronwallBound_ε0 (δ K x : ℝ) : gronwallBound δ K 0 x = δ * exp (K * x) := by
by_cases hK : K = 0 · simp only [gronwallBound_K0, hK, zero_mul, exp_zero, add_zero, mul_one] · simp only [gronwallBound_of_K_ne_0 hK, zero_div, zero_mul, add_zero]
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
156
159
theorem frobeniusMorphism_iso_of_expComparison_iso (h : L ⊣ F) (A : C) [i : IsIso (expComparison F A)] : IsIso (frobeniusMorphism F h A) := by
rw [← frobeniusMorphism_mate F h] at i exact @transferNatTransSelf_of_iso _ _ _ _ _ _ _ _ _ _ _ i
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
121
123
theorem mem_vadd_const_affineSegment {x y z : V} (p : P) : z +ᵥ p ∈ affineSegment R (x +ᵥ p) (y +ᵥ p) ↔ z ∈ affineSegment R x y := by
rw [← affineSegment_vadd_const_image, (vadd_right_injective p).mem_set_image]
import Mathlib.Algebra.BigOperators.Ring import Mathlib.Algebra.Field.Rat import Mathlib.Algebra.Order.Field.Basic import Mathlib.Algebra.Order.Field.Rat import Mathlib.Combinatorics.Enumerative.DoubleCounting import Mathlib.Combinatorics.SetFamily.Shadow #align_import combinatorics.set_family.lym from "leanprover-co...
Mathlib/Combinatorics/SetFamily/LYM.lean
131
133
theorem mem_falling : s ∈ falling k 𝒜 ↔ (∃ t ∈ 𝒜, s ⊆ t) ∧ s.card = k := by
simp_rw [falling, mem_sup, mem_powersetCard] aesop
import Mathlib.Topology.Category.TopCat.EpiMono import Mathlib.Topology.Category.TopCat.Limits.Basic import Mathlib.CategoryTheory.Limits.Shapes.Products import Mathlib.CategoryTheory.Limits.ConcreteCategory import Mathlib.Data.Set.Subsingleton import Mathlib.Tactic.CategoryTheory.Elementwise #align_import topology.c...
Mathlib/Topology/Category/TopCat/Limits/Products.lean
72
73
theorem piIsoPi_inv_π {ι : Type v} (α : ι → TopCat.{max v u}) (i : ι) : (piIsoPi α).inv ≫ Pi.π α i = piπ α i := by
simp [piIsoPi]
import Mathlib.Data.Fintype.List #align_import data.list.cycle from "leanprover-community/mathlib"@"7413128c3bcb3b0818e3e18720abc9ea3100fb49" assert_not_exists MonoidWithZero namespace List variable {α : Type*} [DecidableEq α] def nextOr : ∀ (_ : List α) (_ _ : α), α | [], _, default => default | [_], _, d...
Mathlib/Data/List/Cycle.lean
154
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theorem next_cons_cons_eq' (y z : α) (h : x ∈ y :: z :: l) (hx : x = y) : next (y :: z :: l) x h = z := by
rw [next, nextOr, if_pos hx]
import Mathlib.Topology.Baire.Lemmas import Mathlib.Topology.Algebra.Group.Basic open scoped Topology Pointwise open MulAction Set Function variable {G X : Type*} [TopologicalSpace G] [TopologicalSpace X] [Group G] [TopologicalGroup G] [MulAction G X] [SigmaCompactSpace G] [BaireSpace X] [T2Space X] [Contin...
Mathlib/Topology/Algebra/Group/OpenMapping.lean
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theorem MonoidHom.isOpenMap_of_sigmaCompact {H : Type*} [Group H] [TopologicalSpace H] [BaireSpace H] [T2Space H] [ContinuousMul H] (f : G →* H) (hf : Function.Surjective f) (h'f : Continuous f) : IsOpenMap f := by
let A : MulAction G H := MulAction.compHom _ f have : ContinuousSMul G H := continuousSMul_compHom h'f have : IsPretransitive G H := isPretransitive_compHom hf have : f = (fun (g : G) ↦ g • (1 : H)) := by simp [MulAction.compHom_smul_def] rw [this] exact isOpenMap_smul_of_sigmaCompact _
import Mathlib.Analysis.Calculus.ContDiff.Basic import Mathlib.Analysis.Calculus.Deriv.Mul import Mathlib.Analysis.Calculus.Deriv.Shift import Mathlib.Analysis.Calculus.IteratedDeriv.Defs variable {𝕜 : Type*} [NontriviallyNormedField 𝕜] {F : Type*} [NormedAddCommGroup F] [NormedSpace 𝕜 F] {R : Type*} [Semi...
Mathlib/Analysis/Calculus/IteratedDeriv/Lemmas.lean
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theorem iteratedDeriv_const_mul {n : ℕ} {f : 𝕜 → 𝕜} (h : ContDiff 𝕜 n f) (c : 𝕜) : iteratedDeriv n (fun x => f (c * x)) = fun x => c ^ n * iteratedDeriv n f (c * x) := by
simpa only [smul_eq_mul] using iteratedDeriv_const_smul h c
import Mathlib.Analysis.SpecialFunctions.PolarCoord import Mathlib.Analysis.SpecialFunctions.Gamma.Basic open Real Set MeasureTheory MeasureTheory.Measure section real
Mathlib/MeasureTheory/Integral/Gamma.lean
21
37
theorem integral_rpow_mul_exp_neg_rpow {p q : ℝ} (hp : 0 < p) (hq : - 1 < q) : ∫ x in Ioi (0:ℝ), x ^ q * exp (- x ^ p) = (1 / p) * Gamma ((q + 1) / p) := by
calc _ = ∫ (x : ℝ) in Ioi 0, (1 / p * x ^ (1 / p - 1)) • ((x ^ (1 / p)) ^ q * exp (-x)) := by rw [← integral_comp_rpow_Ioi _ (one_div_ne_zero (ne_of_gt hp)), abs_eq_self.mpr (le_of_lt (one_div_pos.mpr hp))] refine setIntegral_congr measurableSet_Ioi (fun _ hx => ?_) rw [← rpow_mul (le_...
import Mathlib.Data.Bundle import Mathlib.Data.Set.Image import Mathlib.Topology.PartialHomeomorph import Mathlib.Topology.Order.Basic #align_import topology.fiber_bundle.trivialization from "leanprover-community/mathlib"@"e473c3198bb41f68560cab68a0529c854b618833" open TopologicalSpace Filter Set Bundle Function ...
Mathlib/Topology/FiberBundle/Trivialization.lean
175
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theorem symm_apply_mk_proj {x : Z} (ex : x ∈ e.source) : e.toPartialEquiv.symm (proj x, (e x).2) = x := by
rw [← e.coe_fst ex, ← e.coe_coe, e.left_inv ex]
import Mathlib.CategoryTheory.Filtered.Connected import Mathlib.CategoryTheory.Limits.TypesFiltered import Mathlib.CategoryTheory.Limits.Final universe v₁ v₂ u₁ u₂ namespace CategoryTheory open CategoryTheory.Limits CategoryTheory.Functor Opposite section ArbitraryUniverses variable {C : Type u₁} [Category.{v₁}...
Mathlib/CategoryTheory/Filtered/Final.lean
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theorem IsFilteredOrEmpty.of_exists_of_isFiltered_of_fullyFaithful [IsFilteredOrEmpty D] [F.Full] [F.Faithful] (h : ∀ d, ∃ c, Nonempty (d ⟶ F.obj c)) : IsFilteredOrEmpty C where cocone_objs c c' := by
obtain ⟨c₀, ⟨f⟩⟩ := h (IsFiltered.max (F.obj c) (F.obj c')) exact ⟨c₀, F.preimage (IsFiltered.leftToMax _ _ ≫ f), F.preimage (IsFiltered.rightToMax _ _ ≫ f), trivial⟩ cocone_maps {c c'} f g := by obtain ⟨c₀, ⟨f₀⟩⟩ := h (IsFiltered.coeq (F.map f) (F.map g)) refine ⟨_, F.preimage (IsFiltered.coeq...
import Mathlib.Probability.Notation import Mathlib.Probability.Integration import Mathlib.MeasureTheory.Function.L2Space #align_import probability.variance from "leanprover-community/mathlib"@"f0c8bf9245297a541f468be517f1bde6195105e9" open MeasureTheory Filter Finset noncomputable section open scoped MeasureThe...
Mathlib/Probability/Variance.lean
65
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theorem _root_.MeasureTheory.Memℒp.evariance_lt_top [IsFiniteMeasure μ] (hX : Memℒp X 2 μ) : evariance X μ < ∞ := by
have := ENNReal.pow_lt_top (hX.sub <| memℒp_const <| μ[X]).2 2 rw [snorm_eq_lintegral_rpow_nnnorm two_ne_zero ENNReal.two_ne_top, ← ENNReal.rpow_two] at this simp only [coe_two, Pi.sub_apply, ENNReal.one_toReal, one_div] at this rw [← ENNReal.rpow_mul, inv_mul_cancel (two_ne_zero : (2 : ℝ) ≠ 0), ENNReal.rpow_o...
import Mathlib.CategoryTheory.Products.Basic #align_import category_theory.products.bifunctor from "leanprover-community/mathlib"@"dc6c365e751e34d100e80fe6e314c3c3e0fd2988" open CategoryTheory namespace CategoryTheory.Bifunctor universe v₁ v₂ v₃ u₁ u₂ u₃ variable {C : Type u₁} {D : Type u₂} {E : Type u₃} varia...
Mathlib/CategoryTheory/Products/Bifunctor.lean
31
34
theorem map_id_comp (F : C × D ⥤ E) (W : C) {X Y Z : D} (f : X ⟶ Y) (g : Y ⟶ Z) : F.map ((𝟙 W, f ≫ g) : (W, X) ⟶ (W, Z)) = F.map ((𝟙 W, f) : (W, X) ⟶ (W, Y)) ≫ F.map ((𝟙 W, g) : (W, Y) ⟶ (W, Z)) := by
rw [← Functor.map_comp, prod_comp, Category.comp_id]
import Mathlib.CategoryTheory.Limits.Preserves.Shapes.BinaryProducts import Mathlib.CategoryTheory.Limits.Preserves.Shapes.Products import Mathlib.CategoryTheory.Limits.ConcreteCategory import Mathlib.CategoryTheory.Limits.Shapes.Types import Mathlib.CategoryTheory.Limits.Shapes.Multiequalizer import Mathlib.CategoryT...
Mathlib/CategoryTheory/Limits/Shapes/ConcreteCategory.lean
252
259
theorem multiequalizer_ext {I : MulticospanIndex.{w} C} [HasMultiequalizer I] [PreservesLimit I.multicospan (forget C)] (x y : ↑(multiequalizer I)) (h : ∀ t : I.L, Multiequalizer.ι I t x = Multiequalizer.ι I t y) : x = y := by
apply Concrete.limit_ext rintro (a | b) · apply h · rw [← limit.w I.multicospan (WalkingMulticospan.Hom.fst b), comp_apply, comp_apply] simp [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
86
87
theorem left_ne_zero_of_oangle_ne_zero {x y : V} (h : o.oangle x y ≠ 0) : x ≠ 0 := by
rintro rfl; simp at h
import Mathlib.Analysis.Calculus.LineDeriv.Basic import Mathlib.Analysis.Calculus.FDeriv.Measurable open MeasureTheory variable {𝕜 : Type*} [NontriviallyNormedField 𝕜] [LocallyCompactSpace 𝕜] {E : Type*} [NormedAddCommGroup E] [NormedSpace 𝕜 E] [MeasurableSpace E] [OpensMeasurableSpace E] {F : Type*} [Norm...
Mathlib/Analysis/Calculus/LineDeriv/Measurable.lean
72
81
theorem measurableSet_lineDifferentiableAt_uncurry (hf : Continuous f) : MeasurableSet {p : E × E | LineDifferentiableAt 𝕜 f p.1 p.2} := by
borelize 𝕜 let g : (E × E) → 𝕜 → F := fun p t ↦ f (p.1 + t • p.2) have : Continuous g.uncurry := hf.comp <| (continuous_fst.comp continuous_fst).add <| continuous_snd.smul (continuous_snd.comp continuous_fst) have M_meas : MeasurableSet {q : (E × E) × 𝕜 | DifferentiableAt 𝕜 (g q.1) q.2} := meas...
import Mathlib.Analysis.Complex.AbsMax import Mathlib.Analysis.Complex.RemovableSingularity #align_import analysis.complex.schwarz from "leanprover-community/mathlib"@"3f655f5297b030a87d641ad4e825af8d9679eb0b" open Metric Set Function Filter TopologicalSpace open scoped Topology namespace Complex section Space...
Mathlib/Analysis/Complex/Schwarz.lean
92
108
theorem norm_dslope_le_div_of_mapsTo_ball (hd : DifferentiableOn ℂ f (ball c R₁)) (h_maps : MapsTo f (ball c R₁) (ball (f c) R₂)) (hz : z ∈ ball c R₁) : ‖dslope f c z‖ ≤ R₂ / R₁ := by
have hR₁ : 0 < R₁ := nonempty_ball.1 ⟨z, hz⟩ have hR₂ : 0 < R₂ := nonempty_ball.1 ⟨f z, h_maps hz⟩ rcases eq_or_ne (dslope f c z) 0 with hc | hc · rw [hc, norm_zero]; exact div_nonneg hR₂.le hR₁.le rcases exists_dual_vector ℂ _ hc with ⟨g, hg, hgf⟩ have hg' : ‖g‖₊ = 1 := NNReal.eq hg have hg₀ : ‖g‖₊ ≠ 0 ...
import Mathlib.LinearAlgebra.Matrix.Reindex import Mathlib.LinearAlgebra.Matrix.ToLin #align_import linear_algebra.matrix.basis from "leanprover-community/mathlib"@"6c263e4bfc2e6714de30f22178b4d0ca4d149a76" noncomputable section open LinearMap Matrix Set Submodule open Matrix section BasisToMatrix variable {ι...
Mathlib/LinearAlgebra/Matrix/Basis.lean
113
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theorem sum_toMatrix_smul_self [Fintype ι] : ∑ i : ι, e.toMatrix v i j • e i = v j := by
simp_rw [e.toMatrix_apply, e.sum_repr]
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
102
102
theorem or_inr {a b : Bool} (H : b) : a || b := by
cases a <;> simp [H]
import Mathlib.MeasureTheory.Decomposition.RadonNikodym import Mathlib.Probability.Kernel.Disintegration.CdfToKernel #align_import probability.kernel.cond_cdf from "leanprover-community/mathlib"@"3b88f4005dc2e28d42f974cc1ce838f0dafb39b8" open MeasureTheory Set Filter TopologicalSpace open scoped NNReal ENNReal Me...
Mathlib/Probability/Kernel/Disintegration/CondCdf.lean
65
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theorem IicSnd_mono {r r' : ℝ} (h_le : r ≤ r') : ρ.IicSnd r ≤ ρ.IicSnd r' := by
refine Measure.le_iff.2 fun s hs ↦ ?_ simp_rw [IicSnd_apply ρ _ hs] refine measure_mono (prod_subset_prod_iff.mpr (Or.inl ⟨subset_rfl, Iic_subset_Iic.mpr ?_⟩)) exact mod_cast h_le
import Mathlib.Analysis.InnerProductSpace.Basic import Mathlib.LinearAlgebra.SesquilinearForm #align_import analysis.inner_product_space.orthogonal from "leanprover-community/mathlib"@"f0c8bf9245297a541f468be517f1bde6195105e9" variable {𝕜 E F : Type*} [RCLike 𝕜] variable [NormedAddCommGroup E] [InnerProductSpace...
Mathlib/Analysis/InnerProductSpace/Orthogonal.lean
82
83
theorem mem_orthogonal_singleton_iff_inner_left {u v : E} : v ∈ (𝕜 ∙ u)ᗮ ↔ ⟪v, u⟫ = 0 := by
rw [mem_orthogonal_singleton_iff_inner_right, inner_eq_zero_symm]
import Mathlib.Algebra.BigOperators.GroupWithZero.Finset import Mathlib.Algebra.Group.Submonoid.Membership import Mathlib.Algebra.Module.LinearMap.Basic import Mathlib.Data.Finset.Preimage import Mathlib.Data.Set.Finite import Mathlib.GroupTheory.GroupAction.BigOperators #align_import data.dfinsupp.basic from "leanpr...
Mathlib/Data/DFinsupp/Basic.lean
150
154
theorem mapRange_comp (f : ∀ i, β₁ i → β₂ i) (f₂ : ∀ i, β i → β₁ i) (hf : ∀ i, f i 0 = 0) (hf₂ : ∀ i, f₂ i 0 = 0) (h : ∀ i, (f i ∘ f₂ i) 0 = 0) (g : Π₀ i : ι, β i) : mapRange (fun i => f i ∘ f₂ i) h g = mapRange f hf (mapRange f₂ hf₂ g) := by
ext simp only [mapRange_apply]; rfl
import Mathlib.Analysis.Normed.Field.Basic #align_import topology.metric_space.cau_seq_filter from "leanprover-community/mathlib"@"f2ce6086713c78a7f880485f7917ea547a215982" universe u v open Set Filter open scoped Classical open Topology variable {β : Type v} theorem CauSeq.tendsto_limit [NormedRing β] [hn : ...
Mathlib/Topology/MetricSpace/CauSeqFilter.lean
67
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theorem CauSeq.cauchySeq (f : CauSeq β norm) : CauchySeq f := by
refine cauchy_iff.2 ⟨by infer_instance, fun s hs => ?_⟩ rcases mem_uniformity_dist.1 hs with ⟨ε, ⟨hε, hεs⟩⟩ cases' CauSeq.cauchy₂ f hε with N hN exists { n | n ≥ N }.image f simp only [exists_prop, mem_atTop_sets, mem_map, mem_image, ge_iff_le, mem_setOf_eq] constructor · exists N intro b hb exis...
import Mathlib.Data.Complex.Basic import Mathlib.MeasureTheory.Integral.CircleIntegral #align_import measure_theory.integral.circle_transform from "leanprover-community/mathlib"@"d11893b411025250c8e61ff2f12ccbd7ee35ab15" open Set MeasureTheory Metric Filter Function open scoped Interval Real noncomputable secti...
Mathlib/MeasureTheory/Integral/CircleTransform.lean
120
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theorem abs_circleTransformBoundingFunction_le {R r : ℝ} (hr : r < R) (hr' : 0 ≤ r) (z : ℂ) : ∃ x : closedBall z r ×ˢ [[0, 2 * π]], ∀ y : closedBall z r ×ˢ [[0, 2 * π]], abs (circleTransformBoundingFunction R z y) ≤ abs (circleTransformBoundingFunction R z x) := by
have cts := continuousOn_abs_circleTransformBoundingFunction hr z have comp : IsCompact (closedBall z r ×ˢ [[0, 2 * π]]) := by apply_rules [IsCompact.prod, ProperSpace.isCompact_closedBall z r, isCompact_uIcc] have none : (closedBall z r ×ˢ [[0, 2 * π]]).Nonempty := (nonempty_closedBall.2 hr').prod nonem...
import Mathlib.Analysis.InnerProductSpace.Dual import Mathlib.Analysis.Calculus.FDeriv.Basic import Mathlib.Analysis.Calculus.Deriv.Basic open Topology InnerProductSpace Set noncomputable section variable {𝕜 F : Type*} [RCLike 𝕜] variable [NormedAddCommGroup F] [InnerProductSpace 𝕜 F] [CompleteSpace F] variabl...
Mathlib/Analysis/Calculus/Gradient/Basic.lean
138
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theorem hasGradientWithinAt_univ : HasGradientWithinAt f f' univ x ↔ HasGradientAt f f' x := by
rw [hasGradientWithinAt_iff_hasFDerivWithinAt, hasGradientAt_iff_hasFDerivAt] exact hasFDerivWithinAt_univ
import Mathlib.Algebra.Module.Equiv import Mathlib.Algebra.Module.Hom import Mathlib.Algebra.Module.Prod import Mathlib.Algebra.Module.Submodule.Range import Mathlib.Data.Set.Finite import Mathlib.Order.ConditionallyCompleteLattice.Basic import Mathlib.Tactic.Abel #align_import linear_algebra.basic from "leanprover-c...
Mathlib/LinearAlgebra/Basic.lean
83
91
theorem isLinearMap_sub {R M : Type*} [Semiring R] [AddCommGroup M] [Module R M] : IsLinearMap R fun x : M × M => x.1 - x.2 := by
apply IsLinearMap.mk · intro x y -- porting note (#10745): was `simp [add_comm, add_left_comm, sub_eq_add_neg]` rw [Prod.fst_add, Prod.snd_add] abel · intro x y simp [smul_sub]
import Mathlib.Algebra.Field.ULift import Mathlib.Algebra.MvPolynomial.Cardinal import Mathlib.Data.Nat.Factorization.PrimePow import Mathlib.Data.Rat.Denumerable import Mathlib.FieldTheory.Finite.GaloisField import Mathlib.Logic.Equiv.TransferInstance import Mathlib.RingTheory.Localization.Cardinality import Mathlib....
Mathlib/FieldTheory/Cardinality.lean
53
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theorem Fintype.nonempty_field_iff {α} [Fintype α] : Nonempty (Field α) ↔ IsPrimePow ‖α‖ := by
refine ⟨fun ⟨h⟩ => Fintype.isPrimePow_card_of_field, ?_⟩ rintro ⟨p, n, hp, hn, hα⟩ haveI := Fact.mk hp.nat_prime exact ⟨(Fintype.equivOfCardEq ((GaloisField.card p n hn.ne').trans hα)).symm.field⟩
import Mathlib.Topology.ContinuousOn import Mathlib.Data.Set.BoolIndicator open Set Filter Topology TopologicalSpace Classical universe u v variable {X : Type u} {Y : Type v} {ι : Type*} variable [TopologicalSpace X] [TopologicalSpace Y] {s t : Set X} section Clopen protected theorem IsClopen.isOpen (hs : IsClo...
Mathlib/Topology/Clopen.lean
30
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theorem isClopen_iff_frontier_eq_empty : IsClopen s ↔ frontier s = ∅ := by
rw [IsClopen, ← closure_eq_iff_isClosed, ← interior_eq_iff_isOpen, frontier, diff_eq_empty] refine ⟨fun h => (h.1.trans h.2.symm).subset, fun h => ?_⟩ exact ⟨(h.trans interior_subset).antisymm subset_closure, interior_subset.antisymm (subset_closure.trans h)⟩
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
116
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theorem Definable.union {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, hφ⟩ rcases hg with ⟨θ, hθ⟩ refine ⟨φ ⊔ θ, ?_⟩ ext rw [hφ, hθ, mem_setOf_eq, Formula.realize_sup, mem_union, mem_setOf_eq, mem_setOf_eq]
import Mathlib.Data.List.OfFn import Mathlib.Data.List.Nodup import Mathlib.Data.List.Infix #align_import data.list.sort from "leanprover-community/mathlib"@"f694c7dead66f5d4c80f446c796a5aad14707f0e" open List.Perm universe u namespace List section sort variable {α : Type u} (r : α → α → Prop) [DecidableRe...
Mathlib/Data/List/Sort.lean
273
275
theorem orderedInsert_count [DecidableEq α] (L : List α) (a b : α) : count a (L.orderedInsert r b) = count a L + if a = b then 1 else 0 := by
rw [(L.perm_orderedInsert r b).count_eq, count_cons]
import Mathlib.Topology.Basic #align_import topology.nhds_set from "leanprover-community/mathlib"@"f2ce6086713c78a7f880485f7917ea547a215982" open Set Filter Topology variable {X Y : Type*} [TopologicalSpace X] [TopologicalSpace Y] {f : Filter X} {s t s₁ s₂ t₁ t₂ : Set X} {x : X} theorem nhdsSet_diagonal (X) [T...
Mathlib/Topology/NhdsSet.lean
63
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theorem mem_nhdsSet_iff_exists : s ∈ 𝓝ˢ t ↔ ∃ U : Set X, IsOpen U ∧ t ⊆ U ∧ U ⊆ s := by
rw [← subset_interior_iff_mem_nhdsSet, subset_interior_iff]
import Mathlib.Analysis.Calculus.FDeriv.Pi import Mathlib.Analysis.Calculus.Deriv.Basic variable {𝕜 ι : Type*} [DecidableEq ι] [Fintype ι] [NontriviallyNormedField 𝕜]
Mathlib/Analysis/Calculus/Deriv/Pi.lean
15
22
theorem hasDerivAt_update (x : ι → 𝕜) (i : ι) (y : 𝕜) : HasDerivAt (Function.update x i) (Pi.single i (1 : 𝕜)) y := by
convert (hasFDerivAt_update x y).hasDerivAt ext z j rw [Pi.single, Function.update_apply] split_ifs with h · simp [h] · simp [Pi.single_eq_of_ne h]
import Mathlib.MeasureTheory.Integral.Lebesgue import Mathlib.Analysis.MeanInequalities import Mathlib.Analysis.MeanInequalitiesPow import Mathlib.MeasureTheory.Function.SpecialFunctions.Basic #align_import measure_theory.integral.mean_inequalities from "leanprover-community/mathlib"@"13bf7613c96a9fd66a81b9020a82cad9...
Mathlib/MeasureTheory/Integral/MeanInequalities.lean
66
79
theorem lintegral_mul_le_one_of_lintegral_rpow_eq_one {p q : ℝ} (hpq : p.IsConjExponent q) {f g : α → ℝ≥0∞} (hf : AEMeasurable f μ) (hf_norm : ∫⁻ a, f a ^ p ∂μ = 1) (hg_norm : ∫⁻ a, g a ^ q ∂μ = 1) : (∫⁻ a, (f * g) a ∂μ) ≤ 1 := by
calc (∫⁻ a : α, (f * g) a ∂μ) ≤ ∫⁻ a : α, f a ^ p / ENNReal.ofReal p + g a ^ q / ENNReal.ofReal q ∂μ := lintegral_mono fun a => young_inequality (f a) (g a) hpq _ = 1 := by simp only [div_eq_mul_inv] rw [lintegral_add_left'] · rw [lintegral_mul_const'' _ (hf.pow_const p), lint...
import Mathlib.Tactic.CategoryTheory.Coherence import Mathlib.CategoryTheory.Monoidal.Free.Coherence #align_import category_theory.monoidal.coherence_lemmas from "leanprover-community/mathlib"@"b8b8bf3ea0c625fa1f950034a184e07c67f7bcfe" open CategoryTheory Category Iso namespace CategoryTheory.MonoidalCategory v...
Mathlib/CategoryTheory/Monoidal/CoherenceLemmas.lean
30
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theorem leftUnitor_tensor'' (X Y : C) : (α_ (𝟙_ C) X Y).hom ≫ (λ_ (X ⊗ Y)).hom = (λ_ X).hom ⊗ 𝟙 Y := by
coherence
import Mathlib.Algebra.Category.ModuleCat.Abelian import Mathlib.CategoryTheory.Limits.Shapes.Images #align_import algebra.category.Module.images from "leanprover-community/mathlib"@"70fd9563a21e7b963887c9360bd29b2393e6225a" open CategoryTheory open CategoryTheory.Limits universe u v namespace ModuleCat set_op...
Mathlib/Algebra/Category/ModuleCat/Images.lean
81
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theorem image.lift_fac (F' : MonoFactorisation f) : image.lift F' ≫ F'.m = image.ι f := by
ext x change (F'.e ≫ F'.m) _ = _ rw [F'.fac, (Classical.indefiniteDescription _ x.2).2] rfl
import Mathlib.Algebra.Algebra.Subalgebra.Operations import Mathlib.Algebra.Ring.Fin import Mathlib.RingTheory.Ideal.Quotient #align_import ring_theory.ideal.quotient_operations from "leanprover-community/mathlib"@"b88d81c84530450a8989e918608e5960f015e6c8" universe u v w namespace Ideal open Function RingHom var...
Mathlib/RingTheory/Ideal/QuotientOperations.lean
182
185
theorem mem_quotient_iff_mem_sup {I J : Ideal R} {x : R} : Quotient.mk I x ∈ J.map (Quotient.mk I) ↔ x ∈ J ⊔ I := by
rw [← mem_comap, comap_map_of_surjective (Quotient.mk I) Quotient.mk_surjective, ← ker_eq_comap_bot, mk_ker]
import Mathlib.Order.Filter.Bases #align_import order.filter.pi from "leanprover-community/mathlib"@"ce64cd319bb6b3e82f31c2d38e79080d377be451" open Set Function open scoped Classical open Filter namespace Filter variable {ι : Type*} {α : ι → Type*} {f f₁ f₂ : (i : ι) → Filter (α i)} {s : (i : ι) → Set (α i)} ...
Mathlib/Order/Filter/Pi.lean
96
104
theorem mem_of_pi_mem_pi [∀ i, NeBot (f i)] {I : Set ι} (h : I.pi s ∈ pi f) {i : ι} (hi : i ∈ I) : s i ∈ f i := by
rcases mem_pi.1 h with ⟨I', -, t, htf, hts⟩ refine mem_of_superset (htf i) fun x hx => ?_ have : ∀ i, (t i).Nonempty := fun i => nonempty_of_mem (htf i) choose g hg using this have : update g i x ∈ I'.pi t := fun j _ => by rcases eq_or_ne j i with (rfl | hne) <;> simp [*] simpa using hts this i hi
import Mathlib.RingTheory.GradedAlgebra.HomogeneousIdeal #align_import ring_theory.graded_algebra.radical from "leanprover-community/mathlib"@"f1944b30c97c5eb626e498307dec8b022a05bd0a" open GradedRing DirectSum SetLike Finset variable {ι σ A : Type*} variable [CommRing A] variable [LinearOrderedCancelAddCommMono...
Mathlib/RingTheory/GradedAlgebra/Radical.lean
47
136
theorem Ideal.IsHomogeneous.isPrime_of_homogeneous_mem_or_mem {I : Ideal A} (hI : I.IsHomogeneous 𝒜) (I_ne_top : I ≠ ⊤) (homogeneous_mem_or_mem : ∀ {x y : A}, Homogeneous 𝒜 x → Homogeneous 𝒜 y → x * y ∈ I → x ∈ I ∨ y ∈ I) : Ideal.IsPrime I := ⟨I_ne_top, by intro x y hxy by_contra! rid ...
intro x hx rw [filter_nonempty_iff] contrapose! hx simp_rw [proj_apply] at hx rw [← sum_support_decompose 𝒜 x] exact Ideal.sum_mem _ hx set max₁ := set₁.max' (nonempty x rid₁) set max₂ := set₂.max' (nonempty y rid₂) have mem_max₁ : max₁ ∈ set₁ := max'_...
import Mathlib.Data.Finsupp.Basic import Mathlib.Data.List.AList #align_import data.finsupp.alist from "leanprover-community/mathlib"@"59694bd07f0a39c5beccba34bd9f413a160782bf" namespace Finsupp variable {α M : Type*} [Zero M] @[simps] noncomputable def toAList (f : α →₀ M) : AList fun _x : α => M := ⟨f.grap...
Mathlib/Data/Finsupp/AList.lean
48
49
theorem mem_toAlist {f : α →₀ M} {x : α} : x ∈ f.toAList ↔ f x ≠ 0 := by
classical rw [AList.mem_keys, ← List.mem_toFinset, toAList_keys_toFinset, mem_support_iff]
import Mathlib.Algebra.Group.Semiconj.Defs import Mathlib.Algebra.Ring.Defs #align_import algebra.ring.semiconj from "leanprover-community/mathlib"@"70d50ecfd4900dd6d328da39ab7ebd516abe4025" universe u v w x variable {α : Type u} {β : Type v} {γ : Type w} {R : Type x} open Function namespace SemiconjBy @[simp...
Mathlib/Algebra/Ring/Semiconj.lean
95
97
theorem sub_left (ha : SemiconjBy a x y) (hb : SemiconjBy b x y) : SemiconjBy (a - b) x y := by
simpa only [sub_eq_add_neg] using ha.add_left hb.neg_left
import Mathlib.Analysis.Calculus.Deriv.Inv import Mathlib.Analysis.NormedSpace.BallAction import Mathlib.Analysis.SpecialFunctions.ExpDeriv import Mathlib.Analysis.InnerProductSpace.Calculus import Mathlib.Analysis.InnerProductSpace.PiL2 import Mathlib.Geometry.Manifold.Algebra.LieGroup import Mathlib.Geometry.Manifol...
Mathlib/Geometry/Manifold/Instances/Sphere.lean
170
179
theorem contDiff_stereoInvFunAux : ContDiff ℝ ⊤ (stereoInvFunAux v) := by
have h₀ : ContDiff ℝ ⊤ fun w : E => ‖w‖ ^ 2 := contDiff_norm_sq ℝ have h₁ : ContDiff ℝ ⊤ fun w : E => (‖w‖ ^ 2 + 4)⁻¹ := by refine (h₀.add contDiff_const).inv ?_ intro x nlinarith have h₂ : ContDiff ℝ ⊤ fun w => (4 : ℝ) • w + (‖w‖ ^ 2 - 4) • v := by refine (contDiff_const.smul contDiff_id).add ?_...
import Lean.Elab.Tactic.Location import Mathlib.Logic.Basic import Mathlib.Init.Order.Defs import Mathlib.Tactic.Conv import Mathlib.Init.Set import Lean.Elab.Tactic.Location set_option autoImplicit true namespace Mathlib.Tactic.PushNeg open Lean Meta Elab.Tactic Parser.Tactic variable (p q : Prop) (s : α → Prop)...
Mathlib/Tactic/PushNeg.lean
47
48
theorem empty_ne_eq_nonempty (s : Set γ) : (∅ ≠ s) = s.Nonempty := by
rw [ne_comm, ne_empty_eq_nonempty]
import Mathlib.CategoryTheory.Generator import Mathlib.CategoryTheory.Preadditive.Yoneda.Basic #align_import category_theory.preadditive.generator from "leanprover-community/mathlib"@"09f981f72d43749f1fa072deade828d9c1e185bb" universe v u open CategoryTheory Opposite namespace CategoryTheory variable {C : Type...
Mathlib/CategoryTheory/Preadditive/Generator.lean
54
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theorem isSeparator_iff_faithful_preadditiveCoyoneda (G : C) : IsSeparator G ↔ (preadditiveCoyoneda.obj (op G)).Faithful := by
rw [isSeparator_iff_faithful_coyoneda_obj, ← whiskering_preadditiveCoyoneda, Functor.comp_obj, whiskeringRight_obj_obj] exact ⟨fun h => Functor.Faithful.of_comp _ (forget AddCommGroupCat), fun h => Functor.Faithful.comp _ _⟩
import Mathlib.Analysis.Calculus.Deriv.Basic import Mathlib.Analysis.Calculus.FDeriv.Mul import Mathlib.Analysis.Calculus.FDeriv.Add #align_import analysis.calculus.deriv.mul from "leanprover-community/mathlib"@"3bce8d800a6f2b8f63fe1e588fd76a9ff4adcebe" universe u v w noncomputable section open scoped Classical...
Mathlib/Analysis/Calculus/Deriv/Mul.lean
120
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theorem HasDerivWithinAt.smul_const (hc : HasDerivWithinAt c c' s x) (f : F) : HasDerivWithinAt (fun y => c y • f) (c' • f) s x := by
have := hc.smul (hasDerivWithinAt_const x s f) rwa [smul_zero, zero_add] at this
import Mathlib.Topology.MetricSpace.Basic #align_import topology.metric_space.metrizable from "leanprover-community/mathlib"@"f2ce6086713c78a7f880485f7917ea547a215982" open Set Filter Metric open scoped Filter Topology namespace TopologicalSpace variable {ι X Y : Type*} {π : ι → Type*} [TopologicalSpace X] [Top...
Mathlib/Topology/Metrizable/Basic.lean
133
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theorem IsSeparable.secondCountableTopology [PseudoMetrizableSpace X] {s : Set X} (hs : IsSeparable s) : SecondCountableTopology s := by
letI := pseudoMetrizableSpacePseudoMetric X have := hs.separableSpace exact UniformSpace.secondCountable_of_separable s
import Mathlib.Order.Cover import Mathlib.Order.Interval.Finset.Defs #align_import data.finset.locally_finite from "leanprover-community/mathlib"@"442a83d738cb208d3600056c489be16900ba701d" assert_not_exists MonoidWithZero assert_not_exists Finset.sum open Function OrderDual open FinsetInterval variable {ι α : T...
Mathlib/Order/Interval/Finset/Basic.lean
83
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theorem Ico_eq_empty_iff : Ico a b = ∅ ↔ ¬a < b := by
rw [← coe_eq_empty, coe_Ico, Set.Ico_eq_empty_iff]
import Mathlib.Geometry.RingedSpace.PresheafedSpace import Mathlib.CategoryTheory.Limits.Final import Mathlib.Topology.Sheaves.Stalks #align_import algebraic_geometry.stalks from "leanprover-community/mathlib"@"d39590fc8728fbf6743249802486f8c91ffe07bc" noncomputable section universe v u v' u' open Opposite Cate...
Mathlib/Geometry/RingedSpace/Stalks.lean
56
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theorem stalkMap_germ {X Y : PresheafedSpace.{_, _, v} C} (α : X ⟶ Y) (U : Opens Y) (x : (Opens.map α.base).obj U) : Y.presheaf.germ ⟨α.base x.1, x.2⟩ ≫ stalkMap α ↑x = α.c.app (op U) ≫ X.presheaf.germ x := by
rw [stalkMap, stalkFunctor_map_germ_assoc, stalkPushforward_germ]
import Mathlib.Algebra.BigOperators.Group.Finset import Mathlib.Data.List.MinMax import Mathlib.Algebra.Tropical.Basic import Mathlib.Order.ConditionallyCompleteLattice.Finset #align_import algebra.tropical.big_operators from "leanprover-community/mathlib"@"d6fad0e5bf2d6f48da9175d25c3dc5706b3834ce" variable {R S :...
Mathlib/Algebra/Tropical/BigOperators.lean
51
55
theorem trop_sum [AddCommMonoid R] (s : Finset S) (f : S → R) : trop (∑ i ∈ s, f i) = ∏ i ∈ s, trop (f i) := by
convert Multiset.trop_sum (s.val.map f) simp only [Multiset.map_map, Function.comp_apply] rfl
import Mathlib.Combinatorics.SetFamily.Shadow #align_import combinatorics.set_family.compression.uv from "leanprover-community/mathlib"@"6f8ab7de1c4b78a68ab8cf7dd83d549eb78a68a1" open Finset variable {α : Type*} theorem sup_sdiff_injOn [GeneralizedBooleanAlgebra α] (u v : α) : { x | Disjoint u x ∧ v ≤ x }....
Mathlib/Combinatorics/SetFamily/Compression/UV.lean
142
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theorem compress_injOn : Set.InjOn (compress u v) ↑(s.filter (compress u v · ∉ s)) := by
intro a ha b hb hab rw [mem_coe, mem_filter] at ha hb rw [compress] at ha hab split_ifs at ha hab with has · rw [compress] at hb hab split_ifs at hb hab with hbs · exact sup_sdiff_injOn u v has hbs hab · exact (hb.2 hb.1).elim · exact (ha.2 ha.1).elim
import Mathlib.Algebra.Order.Sub.Defs import Mathlib.Data.Finset.Basic import Mathlib.Order.Interval.Finset.Defs open Function namespace Finset class HasAntidiagonal (A : Type*) [AddMonoid A] where antidiagonal : A → Finset (A × A) mem_antidiagonal {n} {a} : a ∈ antidiagonal n ↔ a.fst + a.snd = n exp...
Mathlib/Data/Finset/Antidiagonal.lean
169
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theorem filter_snd_eq_antidiagonal (n m : A) [DecidablePred (· = m)] [Decidable (m ≤ n)] : filter (fun x : A × A ↦ x.snd = m) (antidiagonal n) = if m ≤ n then {(n - m, m)} else ∅ := by
have : (fun x : A × A ↦ (x.snd = m)) ∘ Prod.swap = fun x : A × A ↦ x.fst = m := by ext; simp rw [← map_swap_antidiagonal, filter_map] simp [this, filter_fst_eq_antidiagonal, apply_ite (Finset.map _)]
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
118
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theorem not_mem_setOfIdeal {I : Ideal C(X, R)} {x : X} : x ∉ setOfIdeal I ↔ ∀ ⦃f : C(X, R)⦄, f ∈ I → f x = 0 := by
rw [← Set.mem_compl_iff, setOfIdeal, compl_compl, Set.mem_setOf]
import Mathlib.Combinatorics.SimpleGraph.Connectivity import Mathlib.Data.Nat.Lattice #align_import combinatorics.simple_graph.metric from "leanprover-community/mathlib"@"352ecfe114946c903338006dd3287cb5a9955ff2" namespace SimpleGraph variable {V : Type*} (G : SimpleGraph V) noncomputable def dist (u v : V)...
Mathlib/Combinatorics/SimpleGraph/Metric.lean
144
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theorem Walk.isPath_of_length_eq_dist {u v : V} (p : G.Walk u v) (hp : p.length = G.dist u v) : p.IsPath := by
classical have : p.bypass = p := by apply Walk.bypass_eq_self_of_length_le calc p.length _ = G.dist u v := hp _ ≤ p.bypass.length := dist_le p.bypass rw [← this] apply Walk.bypass_isPath
import Mathlib.Data.Set.Lattice #align_import data.semiquot from "leanprover-community/mathlib"@"09597669f02422ed388036273d8848119699c22f" -- Porting note: removed universe parameter structure Semiquot (α : Type*) where mk' :: s : Set α val : Trunc s #align semiquot Semiquot namespace Semiquot vari...
Mathlib/Data/Semiquot.lean
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theorem liftOn_ofMem (q : Semiquot α) (f : α → β) (h : ∀ a ∈ q, ∀ b ∈ q, f a = f b) (a : α) (aq : a ∈ q) : liftOn q f h = f a := by
revert h; rw [eq_mk_of_mem aq]; intro; rfl
import Mathlib.Algebra.Order.Group.Indicator import Mathlib.Analysis.Normed.Group.Basic #align_import analysis.normed_space.indicator_function from "leanprover-community/mathlib"@"17ef379e997badd73e5eabb4d38f11919ab3c4b3" variable {α E : Type*} [SeminormedAddCommGroup E] {s t : Set α} (f : α → E) (a : α) open Se...
Mathlib/Analysis/NormedSpace/IndicatorFunction.lean
34
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theorem norm_indicator_le_of_subset (h : s ⊆ t) (f : α → E) (a : α) : ‖indicator s f a‖ ≤ ‖indicator t f a‖ := by
simp only [norm_indicator_eq_indicator_norm] exact indicator_le_indicator_of_subset ‹_› (fun _ => norm_nonneg _) _
import Mathlib.Analysis.Calculus.FDeriv.Equiv import Mathlib.Analysis.Calculus.FormalMultilinearSeries #align_import analysis.calculus.cont_diff_def from "leanprover-community/mathlib"@"3a69562db5a458db8322b190ec8d9a8bbd8a5b14" noncomputable section open scoped Classical open NNReal Topology Filter local notatio...
Mathlib/Analysis/Calculus/ContDiff/Defs.lean
223
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theorem HasFTaylorSeriesUpToOn.continuousOn (h : HasFTaylorSeriesUpToOn n f p s) : ContinuousOn f s := by
have := (h.cont 0 bot_le).congr fun x hx => (h.zero_eq' hx).symm rwa [← (continuousMultilinearCurryFin0 𝕜 E F).symm.comp_continuousOn_iff]
import Mathlib.Topology.Order.ProjIcc import Mathlib.Topology.CompactOpen import Mathlib.Topology.UnitInterval #align_import topology.path_connected from "leanprover-community/mathlib"@"f2ce6086713c78a7f880485f7917ea547a215982" noncomputable section open scoped Classical open Topology Filter unitInterval Set Fun...
Mathlib/Topology/Connected/PathConnected.lean
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theorem symm_symm (γ : Path x y) : γ.symm.symm = γ := by
ext t show γ (σ (σ t)) = γ t rw [unitInterval.symm_symm]
import Mathlib.MeasureTheory.MeasurableSpace.Defs import Mathlib.Order.Filter.CountableInter open Filter Set MeasurableSpace variable {α : Type*} (m : MeasurableSpace α) (l : Filter α) [CountableInterFilter l] {s t : Set α} def EventuallyMeasurableSpace : MeasurableSpace α where MeasurableSet' s := ∃ t, Measu...
Mathlib/MeasureTheory/Constructions/EventuallyMeasurable.lean
67
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theorem EventuallyMeasurableSet.congr (ht : EventuallyMeasurableSet m l t) (hst : s =ᶠ[l] t) : EventuallyMeasurableSet m l s := by
rcases ht with ⟨t', ht', htt'⟩ exact ⟨t', ht', hst.trans htt'⟩
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
371
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theorem bihimp_bot : a ⇔ ⊥ = aᶜ := by
simp [bihimp]
import Mathlib.LinearAlgebra.CliffordAlgebra.Contraction variable {R M : Type*} variable [CommRing R] [AddCommGroup M] [Module R M] {Q : QuadraticForm R M} namespace CliffordAlgebra variable (Q) def invertibleιOfInvertible (m : M) [Invertible (Q m)] : Invertible (ι Q m) where invOf := ι Q (⅟ (Q m) • m) invO...
Mathlib/LinearAlgebra/CliffordAlgebra/Inversion.lean
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theorem isUnit_of_isUnit_ι {m : M} (h : IsUnit (ι Q m)) : IsUnit (Q m) := by
cases h.nonempty_invertible letI := invertibleOfInvertibleι Q m exact isUnit_of_invertible (Q m)
import Mathlib.Algebra.MvPolynomial.Supported import Mathlib.RingTheory.Derivation.Basic #align_import data.mv_polynomial.derivation from "leanprover-community/mathlib"@"b608348ffaeb7f557f2fd46876037abafd326ff3" namespace MvPolynomial noncomputable section variable {σ R A : Type*} [CommSemiring R] [AddCommMonoi...
Mathlib/Algebra/MvPolynomial/Derivation.lean
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theorem derivation_C_mul (D : Derivation R (MvPolynomial σ R) A) (a : R) (f : MvPolynomial σ R) : C (σ := σ) a • D f = a • D f := by
have : C (σ := σ) a • D f = D (C a * f) := by simp rw [this, C_mul', D.map_smul]
import Mathlib.GroupTheory.Sylow import Mathlib.GroupTheory.Transfer #align_import group_theory.schur_zassenhaus from "leanprover-community/mathlib"@"d57133e49cf06508700ef69030cd099917e0f0de" namespace Subgroup section SchurZassenhausAbelian open MulOpposite MulAction Subgroup.leftTransversals MemLeftTransversa...
Mathlib/GroupTheory/SchurZassenhaus.lean
48
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theorem smul_diff_smul' [hH : Normal H] (g : Gᵐᵒᵖ) : diff (MonoidHom.id H) (g • α) (g • β) = ⟨g.unop⁻¹ * (diff (MonoidHom.id H) α β : H) * g.unop, hH.mem_comm ((congr_arg (· ∈ H) (mul_inv_cancel_left _ _)).mpr (SetLike.coe_mem _))⟩ := by
letI := H.fintypeQuotientOfFiniteIndex let ϕ : H →* H := { toFun := fun h => ⟨g.unop⁻¹ * h * g.unop, hH.mem_comm ((congr_arg (· ∈ H) (mul_inv_cancel_left _ _)).mpr (SetLike.coe_mem _))⟩ map_one' := by rw [Subtype.ext_iff, coe_mk, coe_one, mul_one, inv_mul_self] map_mul' := fun h₁ ...
import Mathlib.Analysis.Convex.Between import Mathlib.Analysis.Convex.Normed import Mathlib.Analysis.Normed.Group.AddTorsor #align_import analysis.convex.side from "leanprover-community/mathlib"@"a63928c34ec358b5edcda2bf7513c50052a5230f" variable {R V V' P P' : Type*} open AffineEquiv AffineMap namespace Affine...
Mathlib/Analysis/Convex/Side.lean
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theorem WSameSide.map {s : AffineSubspace R P} {x y : P} (h : s.WSameSide x y) (f : P →ᵃ[R] P') : (s.map f).WSameSide (f x) (f y) := by
rcases h with ⟨p₁, hp₁, p₂, hp₂, h⟩ refine ⟨f p₁, mem_map_of_mem f hp₁, f p₂, mem_map_of_mem f hp₂, ?_⟩ simp_rw [← linearMap_vsub] exact h.map f.linear
import Mathlib.Order.RelClasses import Mathlib.Order.Interval.Set.Basic #align_import order.bounded from "leanprover-community/mathlib"@"aba57d4d3dae35460225919dcd82fe91355162f9" namespace Set variable {α : Type*} {r : α → α → Prop} {s t : Set α} theorem Bounded.mono (hst : s ⊆ t) (hs : Bounded r t) : Bounde...
Mathlib/Order/Bounded.lean
44
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theorem unbounded_le_iff [LinearOrder α] : Unbounded (· ≤ ·) s ↔ ∀ a, ∃ b ∈ s, a < b := by
simp only [Unbounded, not_le]
import Mathlib.Analysis.InnerProductSpace.Orthogonal import Mathlib.Analysis.Normed.Group.AddTorsor #align_import geometry.euclidean.basic from "leanprover-community/mathlib"@"2de9c37fa71dde2f1c6feff19876dd6a7b1519f0" open Set open scoped RealInnerProductSpace variable {V P : Type*} [NormedAddCommGroup V] [InnerP...
Mathlib/Geometry/Euclidean/PerpBisector.lean
65
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theorem midpoint_mem_perpBisector (p₁ p₂ : P) : midpoint ℝ p₁ p₂ ∈ perpBisector p₁ p₂ := by
simp [mem_perpBisector_iff_inner_eq_zero]
import Mathlib.Algebra.Order.Sub.Defs import Mathlib.Data.Finset.Basic import Mathlib.Order.Interval.Finset.Defs open Function namespace Finset class HasAntidiagonal (A : Type*) [AddMonoid A] where antidiagonal : A → Finset (A × A) mem_antidiagonal {n} {a} : a ∈ antidiagonal n ↔ a.fst + a.snd = n exp...
Mathlib/Data/Finset/Antidiagonal.lean
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theorem swap_mem_antidiagonal [AddCommMonoid A] [HasAntidiagonal A] {n : A} {xy : A × A}: xy.swap ∈ antidiagonal n ↔ xy ∈ antidiagonal n := by
simp [add_comm]
import Mathlib.Data.Real.NNReal import Mathlib.RingTheory.Valuation.Basic noncomputable section open Function Multiplicative open scoped NNReal variable {R : Type*} [Ring R] {Γ₀ : Type*} [LinearOrderedCommGroupWithZero Γ₀] namespace Valuation class RankOne (v : Valuation R Γ₀) where hom : Γ₀ →*₀ ℝ≥0 st...
Mathlib/RingTheory/Valuation/RankOne.lean
67
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theorem unit_ne_one : unit v ≠ 1 := by
rw [Ne, ← Units.eq_iff, Units.val_one] exact ((nontrivial v).choose_spec ).2
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
101
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theorem IsPositive.conj_orthogonalProjection (U : Submodule 𝕜 E) {T : E →L[𝕜] E} (hT : T.IsPositive) [CompleteSpace U] : (U.subtypeL ∘L orthogonalProjection U ∘L T ∘L U.subtypeL ∘L orthogonalProjection U).IsPositive := by
have := hT.conj_adjoint (U.subtypeL ∘L orthogonalProjection U) rwa [(orthogonalProjection_isSelfAdjoint U).adjoint_eq] at this
import Mathlib.Algebra.Associated import Mathlib.Algebra.BigOperators.Finsupp #align_import algebra.big_operators.associated from "leanprover-community/mathlib"@"f7fc89d5d5ff1db2d1242c7bb0e9062ce47ef47c" variable {α β γ δ : Type*} -- the same local notation used in `Algebra.Associated` local infixl:50 " ~ᵤ " => ...
Mathlib/Algebra/BigOperators/Associated.lean
103
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theorem Finset.prod_primes_dvd [CancelCommMonoidWithZero α] [Unique αˣ] {s : Finset α} (n : α) (h : ∀ a ∈ s, Prime a) (div : ∀ a ∈ s, a ∣ n) : (∏ p ∈ s, p) ∣ n := by
classical exact Multiset.prod_primes_dvd n (by simpa only [Multiset.map_id', Finset.mem_def] using h) (by simpa only [Multiset.map_id', Finset.mem_def] using div) (by simp only [Multiset.map_id', associated_eq_eq, Multiset.countP_eq_card_filter, ← s.val.count_eq_card_f...
import Mathlib.Analysis.Complex.Basic import Mathlib.Analysis.NormedSpace.OperatorNorm.NormedSpace import Mathlib.Data.Complex.Determinant #align_import analysis.complex.operator_norm from "leanprover-community/mathlib"@"468b141b14016d54b479eb7a0fff1e360b7e3cf6" open ContinuousLinearMap namespace Complex @[simp...
Mathlib/Analysis/Complex/OperatorNorm.lean
37
41
theorem reCLM_norm : ‖reCLM‖ = 1 := le_antisymm (LinearMap.mkContinuous_norm_le _ zero_le_one _) <| calc 1 = ‖reCLM 1‖ := by
simp _ ≤ ‖reCLM‖ := unit_le_opNorm _ _ (by simp)
import Mathlib.Logic.Pairwise import Mathlib.Order.CompleteBooleanAlgebra import Mathlib.Order.Directed import Mathlib.Order.GaloisConnection #align_import data.set.lattice from "leanprover-community/mathlib"@"b86832321b586c6ac23ef8cdef6a7a27e42b13bd" open Function Set universe u variable {α β γ : Type*} {ι ι' ι...
Mathlib/Data/Set/Lattice.lean
67
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theorem mem_iUnion₂ {x : γ} {s : ∀ i, κ i → Set γ} : (x ∈ ⋃ (i) (j), s i j) ↔ ∃ i j, x ∈ s i j := by
simp_rw [mem_iUnion]
import Mathlib.Algebra.PUnitInstances import Mathlib.Tactic.Abel import Mathlib.Tactic.Ring import Mathlib.Order.Hom.Lattice #align_import algebra.ring.boolean_ring from "leanprover-community/mathlib"@"e8638a0fcaf73e4500469f368ef9494e495099b3" open scoped symmDiff variable {α β γ : Type*} class BooleanRing (α) ...
Mathlib/Algebra/Ring/BooleanRing.lean
83
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theorem add_eq_zero' : a + b = 0 ↔ a = b := calc a + b = 0 ↔ a = -b := add_eq_zero_iff_eq_neg _ ↔ a = b := by
rw [neg_eq]
import Mathlib.Data.Complex.Module import Mathlib.Data.Complex.Order import Mathlib.Data.Complex.Exponential import Mathlib.Analysis.RCLike.Basic import Mathlib.Topology.Algebra.InfiniteSum.Module import Mathlib.Topology.Instances.RealVectorSpace #align_import analysis.complex.basic from "leanprover-community/mathlib...
Mathlib/Analysis/Complex/Basic.lean
146
146
theorem dist_self_conj (z : ℂ) : dist z (conj z) = 2 * |z.im| := by
rw [dist_comm, dist_conj_self]
import Mathlib.Data.Fin.VecNotation import Mathlib.SetTheory.Cardinal.Basic #align_import model_theory.basic from "leanprover-community/mathlib"@"369525b73f229ccd76a6ec0e0e0bf2be57599768" set_option autoImplicit true universe u v u' v' w w' open Cardinal open Cardinal namespace FirstOrder -- intended to b...
Mathlib/ModelTheory/Basic.lean
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theorem sum_card : Cardinal.sum (fun i => #(Sequence₂ a₀ a₁ a₂ i)) = #a₀ + #a₁ + #a₂ := by
rw [sum_nat_eq_add_sum_succ, sum_nat_eq_add_sum_succ, sum_nat_eq_add_sum_succ] simp [add_assoc, Sequence₂]
import Mathlib.Analysis.InnerProductSpace.Dual import Mathlib.Analysis.InnerProductSpace.Orientation import Mathlib.Data.Complex.Orientation import Mathlib.Tactic.LinearCombination #align_import analysis.inner_product_space.two_dim from "leanprover-community/mathlib"@"cd8fafa2fac98e1a67097e8a91ad9901cfde48af" non...
Mathlib/Analysis/InnerProductSpace/TwoDim.lean
125
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theorem areaForm_neg_orientation : (-o).areaForm = -o.areaForm := by
ext x y simp [areaForm_to_volumeForm]
import Mathlib.Data.Nat.Count import Mathlib.Data.Nat.SuccPred import Mathlib.Order.Interval.Set.Monotone import Mathlib.Order.OrderIsoNat #align_import data.nat.nth from "leanprover-community/mathlib"@"7fdd4f3746cb059edfdb5d52cba98f66fce418c0" open Finset namespace Nat variable (p : ℕ → Prop) noncomputable d...
Mathlib/Data/Nat/Nth.lean
127
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theorem exists_lt_card_finite_nth_eq (hf : (setOf p).Finite) {x} (h : p x) : ∃ n, n < hf.toFinset.card ∧ nth p n = x := by
rwa [← @Set.mem_setOf_eq _ _ p, ← image_nth_Iio_card hf] at h
import Mathlib.Geometry.Manifold.MFDeriv.SpecificFunctions noncomputable section open scoped Manifold open Bundle Set Topology variable {𝕜 : Type*} [NontriviallyNormedField 𝕜] {E : Type*} [NormedAddCommGroup E] [NormedSpace 𝕜 E] {H : Type*} [TopologicalSpace H] (I : ModelWithCorners 𝕜 E H) {M : Type*} [To...
Mathlib/Geometry/Manifold/MFDeriv/Atlas.lean
146
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theorem tangentMap_chart {p q : TangentBundle I M} (h : q.1 ∈ (chartAt H p.1).source) : tangentMap I I (chartAt H p.1) q = (TotalSpace.toProd _ _).symm ((chartAt (ModelProd H E) p : TangentBundle I M → ModelProd H E) q) := by
dsimp [tangentMap] rw [MDifferentiableAt.mfderiv] · rfl · exact mdifferentiableAt_atlas _ (chart_mem_atlas _ _) h
import Mathlib.Order.Filter.Lift import Mathlib.Topology.Separation import Mathlib.Order.Interval.Set.Monotone #align_import topology.filter from "leanprover-community/mathlib"@"4c19a16e4b705bf135cf9a80ac18fcc99c438514" open Set Filter TopologicalSpace open Filter Topology variable {ι : Sort*} {α β X Y : Type*}...
Mathlib/Topology/Filter.lean
59
66
theorem isTopologicalBasis_Iic_principal : IsTopologicalBasis (range (Iic ∘ 𝓟 : Set α → Set (Filter α))) := { exists_subset_inter := by
rintro _ ⟨s, rfl⟩ _ ⟨t, rfl⟩ l hl exact ⟨Iic (𝓟 s) ∩ Iic (𝓟 t), ⟨s ∩ t, by simp⟩, hl, Subset.rfl⟩ sUnion_eq := sUnion_eq_univ_iff.2 fun l => ⟨Iic ⊤, ⟨univ, congr_arg Iic principal_univ⟩, mem_Iic.2 le_top⟩ eq_generateFrom := rfl }
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
177
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theorem symm_trans_self (h : X ≃ₜ Y) : h.symm.trans h = Homeomorph.refl Y := by
ext apply apply_symm_apply
import Mathlib.LinearAlgebra.Finsupp import Mathlib.Algebra.MonoidAlgebra.Support import Mathlib.Algebra.DirectSum.Internal import Mathlib.RingTheory.GradedAlgebra.Basic #align_import algebra.monoid_algebra.grading from "leanprover-community/mathlib"@"feb99064803fd3108e37c18b0f77d0a8344677a3" noncomputable sectio...
Mathlib/Algebra/MonoidAlgebra/Grading.lean
63
64
theorem mem_gradeBy_iff (f : M → ι) (i : ι) (a : R[M]) : a ∈ gradeBy R f i ↔ (a.support : Set M) ⊆ f ⁻¹' {i} := by
rfl
import Mathlib.Algebra.BigOperators.Ring import Mathlib.Combinatorics.Derangements.Basic import Mathlib.Data.Fintype.BigOperators import Mathlib.Tactic.Ring #align_import combinatorics.derangements.finite from "leanprover-community/mathlib"@"c3019c79074b0619edb4b27553a91b2e82242395" open derangements Equiv Fintyp...
Mathlib/Combinatorics/Derangements/Finite.lean
45
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theorem card_derangements_fin_add_two (n : ℕ) : card (derangements (Fin (n + 2))) = (n + 1) * card (derangements (Fin n)) + (n + 1) * card (derangements (Fin (n + 1))) := by
-- get some basic results about the size of fin (n+1) plus or minus an element have h1 : ∀ a : Fin (n + 1), card ({a}ᶜ : Set (Fin (n + 1))) = card (Fin n) := by intro a simp only [Fintype.card_fin, Finset.card_fin, Fintype.card_ofFinset, Finset.filter_ne' _ a, Set.mem_compl_singleton_iff, Finset.card...