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import Mathlib.Computability.Encoding import Mathlib.Logic.Small.List import Mathlib.ModelTheory.Syntax import Mathlib.SetTheory.Cardinal.Ordinal #align_import model_theory.encoding from "leanprover-community/mathlib"@"91288e351d51b3f0748f0a38faa7613fb0ae2ada" universe u v w u' v' namespace FirstOrder namespace...
Mathlib/ModelTheory/Encoding.lean
122
151
theorem card_sigma : #(Σn, L.Term (Sum α (Fin n))) = max ℵ₀ #(Sum α (Σi, L.Functions i)) := by
refine le_antisymm ?_ ?_ · rw [mk_sigma] refine (sum_le_iSup_lift _).trans ?_ rw [mk_nat, lift_aleph0, mul_eq_max_of_aleph0_le_left le_rfl, max_le_iff, ciSup_le_iff' (bddAbove_range _)] · refine ⟨le_max_left _ _, fun i => card_le.trans ?_⟩ refine max_le (le_max_left _ _) ?_ rw [← add_...
import Mathlib.Data.Set.Basic open Function universe u v namespace Set section Subsingleton variable {α : Type u} {a : α} {s t : Set α} protected def Subsingleton (s : Set α) : Prop := ∀ ⦃x⦄ (_ : x ∈ s) ⦃y⦄ (_ : y ∈ s), x = y #align set.subsingleton Set.Subsingleton theorem Subsingleton.anti (ht : t.Subs...
Mathlib/Data/Set/Subsingleton.lean
99
104
theorem exists_eq_singleton_iff_nonempty_subsingleton : (∃ a : α, s = {a}) ↔ s.Nonempty ∧ s.Subsingleton := by
refine ⟨?_, fun h => ?_⟩ · rintro ⟨a, rfl⟩ exact ⟨singleton_nonempty a, subsingleton_singleton⟩ · exact h.2.eq_empty_or_singleton.resolve_left h.1.ne_empty
import Mathlib.Dynamics.Ergodic.MeasurePreserving import Mathlib.LinearAlgebra.Determinant import Mathlib.LinearAlgebra.Matrix.Diagonal import Mathlib.LinearAlgebra.Matrix.Transvection import Mathlib.MeasureTheory.Group.LIntegral import Mathlib.MeasureTheory.Integral.Marginal import Mathlib.MeasureTheory.Measure.Stiel...
Mathlib/MeasureTheory/Measure/Lebesgue/Basic.lean
96
96
theorem volume_singleton {a : ℝ} : volume ({a} : Set ℝ) = 0 := by
simp [volume_val]
import Mathlib.Algebra.Field.Subfield import Mathlib.Algebra.GroupWithZero.Divisibility import Mathlib.Topology.Algebra.GroupWithZero import Mathlib.Topology.Algebra.Ring.Basic import Mathlib.Topology.Order.LocalExtr #align_import topology.algebra.field from "leanprover-community/mathlib"@"c10e724be91096453ee3db13862...
Mathlib/Topology/Algebra/Field.lean
112
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theorem IsLocalMin.inv {f : α → β} {a : α} (h1 : IsLocalMin f a) (h2 : ∀ᶠ z in 𝓝 a, 0 < f z) : IsLocalMax f⁻¹ a := by
filter_upwards [h1, h2] with z h3 h4 using(inv_le_inv h4 h2.self_of_nhds).mpr h3
import Mathlib.Algebra.BigOperators.Group.Finset import Mathlib.Algebra.Group.Commute.Hom import Mathlib.Data.Fintype.Card #align_import data.finset.noncomm_prod from "leanprover-community/mathlib"@"509de852e1de55e1efa8eacfa11df0823f26f226" variable {F ι α β γ : Type*} (f : α → β → β) (op : α → α → α) namespace M...
Mathlib/Data/Finset/NoncommProd.lean
64
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theorem noncommFoldr_cons (s : Multiset α) (a : α) (h h') (b : β) : noncommFoldr f (a ::ₘ s) h b = f a (noncommFoldr f s h' b) := by
induction s using Quotient.inductionOn simp
import Mathlib.CategoryTheory.Balanced import Mathlib.CategoryTheory.Limits.EssentiallySmall import Mathlib.CategoryTheory.Limits.Opposites import Mathlib.CategoryTheory.Limits.Shapes.ZeroMorphisms import Mathlib.CategoryTheory.Subobject.Lattice import Mathlib.CategoryTheory.Subobject.WellPowered import Mathlib.Data.S...
Mathlib/CategoryTheory/Generator.lean
93
98
theorem isSeparating_op_iff (𝒢 : Set C) : IsSeparating 𝒢.op ↔ IsCoseparating 𝒢 := by
refine ⟨fun h𝒢 X Y f g hfg => ?_, fun h𝒢 X Y f g hfg => ?_⟩ · refine Quiver.Hom.op_inj (h𝒢 _ _ fun G hG h => Quiver.Hom.unop_inj ?_) simpa only [unop_comp, Quiver.Hom.unop_op] using hfg _ (Set.mem_op.1 hG) _ · refine Quiver.Hom.unop_inj (h𝒢 _ _ fun G hG h => Quiver.Hom.op_inj ?_) simpa only [op_comp,...
import Mathlib.Order.Interval.Set.Basic import Mathlib.Order.Hom.Set #align_import data.set.intervals.order_iso from "leanprover-community/mathlib"@"d012cd09a9b256d870751284dd6a29882b0be105" open Set namespace OrderIso section Preorder variable {α β : Type*} [Preorder α] [Preorder β] @[simp] theorem preimage_I...
Mathlib/Order/Interval/Set/OrderIso.lean
98
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theorem image_Ico (e : α ≃o β) (a b : α) : e '' Ico a b = Ico (e a) (e b) := by
rw [e.image_eq_preimage, e.symm.preimage_Ico, e.symm_symm]
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
68
68
theorem oangle_zero_left (x : V) : o.oangle 0 x = 0 := by
simp [oangle]
import Mathlib.Algebra.MonoidAlgebra.Degree import Mathlib.Algebra.Polynomial.Coeff import Mathlib.Algebra.Polynomial.Monomial import Mathlib.Data.Fintype.BigOperators import Mathlib.Data.Nat.WithBot import Mathlib.Data.Nat.Cast.WithTop import Mathlib.Data.Nat.SuccPred #align_import data.polynomial.degree.definitions...
Mathlib/Algebra/Polynomial/Degree/Definitions.lean
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theorem natDegree_of_subsingleton [Subsingleton R] : natDegree p = 0 := by
rw [Subsingleton.elim p 0, natDegree_zero]
import Mathlib.Algebra.GCDMonoid.Basic import Mathlib.RingTheory.IntegrallyClosed import Mathlib.RingTheory.Polynomial.Eisenstein.Basic #align_import algebra.gcd_monoid.integrally_closed from "leanprover-community/mathlib"@"2032a878972d5672e7c27c957e7a6e297b044973" open scoped Polynomial variable {R A : Type*} [...
Mathlib/Algebra/GCDMonoid/IntegrallyClosed.lean
23
30
theorem IsLocalization.surj_of_gcd_domain [GCDMonoid R] (M : Submonoid R) [IsLocalization M A] (z : A) : ∃ a b : R, IsUnit (gcd a b) ∧ z * algebraMap R A b = algebraMap R A a := by
obtain ⟨x, ⟨y, hy⟩, rfl⟩ := IsLocalization.mk'_surjective M z obtain ⟨x', y', hx', hy', hu⟩ := extract_gcd x y use x', y', hu rw [mul_comm, IsLocalization.mul_mk'_eq_mk'_of_mul] convert IsLocalization.mk'_mul_cancel_left (M := M) (S := A) _ _ using 2 rw [Subtype.coe_mk, hy', ← mul_comm y', mul_assoc]; conv...
import Mathlib.LinearAlgebra.Matrix.DotProduct import Mathlib.LinearAlgebra.Determinant import Mathlib.LinearAlgebra.Matrix.Diagonal #align_import data.matrix.rank from "leanprover-community/mathlib"@"17219820a8aa8abe85adf5dfde19af1dd1bd8ae7" open Matrix namespace Matrix open FiniteDimensional variable {l m n ...
Mathlib/Data/Matrix/Rank.lean
140
142
theorem rank_submatrix [Fintype m] (A : Matrix m m R) (e₁ e₂ : n ≃ m) : rank (A.submatrix e₁ e₂) = rank A := by
simpa only [reindex_apply] using rank_reindex e₁.symm e₂.symm A
import Mathlib.Analysis.Calculus.ContDiff.Basic import Mathlib.Analysis.Calculus.Deriv.Linear import Mathlib.Analysis.Complex.Conformal import Mathlib.Analysis.Calculus.Conformal.NormedSpace #align_import analysis.complex.real_deriv from "leanprover-community/mathlib"@"3bce8d800a6f2b8f63fe1e588fd76a9ff4adcebe" se...
Mathlib/Analysis/Complex/RealDeriv.lean
171
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theorem conformalAt_iff_differentiableAt_or_differentiableAt_comp_conj {f : ℂ → ℂ} {z : ℂ} : ConformalAt f z ↔ (DifferentiableAt ℂ f z ∨ DifferentiableAt ℂ (f ∘ conj) (conj z)) ∧ fderiv ℝ f z ≠ 0 := by
rw [conformalAt_iff_isConformalMap_fderiv] rw [isConformalMap_iff_is_complex_or_conj_linear] apply and_congr_left intro h have h_diff := h.imp_symm fderiv_zero_of_not_differentiableAt apply or_congr · rw [differentiableAt_iff_restrictScalars ℝ h_diff] rw [← conj_conj z] at h_diff rw [differentiableAt...
import Mathlib.Topology.MetricSpace.HausdorffDistance import Mathlib.MeasureTheory.Constructions.BorelSpace.Order #align_import measure_theory.measure.regular from "leanprover-community/mathlib"@"bf6a01357ff5684b1ebcd0f1a13be314fc82c0bf" open Set Filter ENNReal Topology NNReal TopologicalSpace namespace MeasureTh...
Mathlib/MeasureTheory/Measure/Regular.lean
361
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theorem _root_.Set.exists_isOpen_le_add (A : Set α) (μ : Measure α) [OuterRegular μ] {ε : ℝ≥0∞} (hε : ε ≠ 0) : ∃ U, U ⊇ A ∧ IsOpen U ∧ μ U ≤ μ A + ε := by
rcases eq_or_ne (μ A) ∞ with (H | H) · exact ⟨univ, subset_univ _, isOpen_univ, by simp only [H, _root_.top_add, le_top]⟩ · rcases A.exists_isOpen_lt_add H hε with ⟨U, AU, U_open, hU⟩ exact ⟨U, AU, U_open, hU.le⟩
import Mathlib.Probability.IdentDistrib import Mathlib.MeasureTheory.Integral.DominatedConvergence import Mathlib.Analysis.SpecificLimits.FloorPow import Mathlib.Analysis.PSeries import Mathlib.Analysis.Asymptotics.SpecificAsymptotics #align_import probability.strong_law from "leanprover-community/mathlib"@"f2ce60867...
Mathlib/Probability/StrongLaw.lean
106
111
theorem truncation_eq_self {f : α → ℝ} {A : ℝ} {x : α} (h : |f x| < A) : truncation f A x = f x := by
simp only [truncation, indicator, Set.mem_Icc, id, Function.comp_apply, ite_eq_left_iff] intro H apply H.elim simp [(abs_lt.1 h).1, (abs_lt.1 h).2.le]
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
229
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theorem mem_coprodᵢ_iff {s : Set (∀ i, α i)} : s ∈ Filter.coprodᵢ f ↔ ∀ i : ι, ∃ t₁ ∈ f i, eval i ⁻¹' t₁ ⊆ s := by
simp [Filter.coprodᵢ]
import Batteries.Data.Fin.Basic namespace Fin attribute [norm_cast] val_last protected theorem le_antisymm_iff {x y : Fin n} : x = y ↔ x ≤ y ∧ y ≤ x := Fin.ext_iff.trans Nat.le_antisymm_iff protected theorem le_antisymm {x y : Fin n} (h1 : x ≤ y) (h2 : y ≤ x) : x = y := Fin.le_antisymm_iff.2 ⟨h1, h2⟩ @[simp...
.lake/packages/batteries/Batteries/Data/Fin/Lemmas.lean
87
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theorem foldl_eq_foldl_list (f : α → Fin n → α) (x) : foldl n f x = (list n).foldl f x := by
induction n generalizing x with | zero => rw [foldl_zero, list_zero, List.foldl_nil] | succ n ih => rw [foldl_succ, ih, list_succ, List.foldl_cons, List.foldl_map]
import Mathlib.LinearAlgebra.AffineSpace.AffineMap import Mathlib.Tactic.FieldSimp #align_import linear_algebra.affine_space.slope from "leanprover-community/mathlib"@"70fd9563a21e7b963887c9360bd29b2393e6225a" open AffineMap variable {k E PE : Type*} [Field k] [AddCommGroup E] [Module k E] [AddTorsor E PE] def ...
Mathlib/LinearAlgebra/AffineSpace/Slope.lean
121
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theorem lineMap_slope_slope_sub_div_sub (f : k → PE) (a b c : k) (h : a ≠ c) : lineMap (slope f a b) (slope f b c) ((c - b) / (c - a)) = slope f a c := by
field_simp [sub_ne_zero.2 h.symm, ← sub_div_sub_smul_slope_add_sub_div_sub_smul_slope f a b c, lineMap_apply_module]
import Mathlib.Algebra.BigOperators.Intervals import Mathlib.Algebra.BigOperators.Ring.List import Mathlib.Data.Int.ModEq import Mathlib.Data.Nat.Bits import Mathlib.Data.Nat.Log import Mathlib.Data.List.Indexes import Mathlib.Data.List.Palindrome import Mathlib.Tactic.IntervalCases import Mathlib.Tactic.Linarith impo...
Mathlib/Data/Nat/Digits.lean
167
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theorem ofDigits_eq_foldr {α : Type*} [Semiring α] (b : α) (L : List ℕ) : ofDigits b L = List.foldr (fun x y => ↑x + b * y) 0 L := by
induction' L with d L ih · rfl · dsimp [ofDigits] rw [ih]
import Mathlib.Data.Set.Lattice #align_import data.set.intervals.disjoint from "leanprover-community/mathlib"@"207cfac9fcd06138865b5d04f7091e46d9320432" universe u v w variable {ι : Sort u} {α : Type v} {β : Type w} open Set open OrderDual (toDual) namespace Set section Preorder variable [Preorder α] {a b c...
Mathlib/Order/Interval/Set/Disjoint.lean
122
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theorem iUnion_Ioo_right [NoMaxOrder α] (a : α) : ⋃ b, Ioo a b = Ioi a := by
simp only [← Ioi_inter_Iio, ← inter_iUnion, iUnion_Iio, inter_univ]
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
100
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theorem _root_.MeasureTheory.Memℒp.ofReal_variance_eq [IsFiniteMeasure μ] (hX : Memℒp X 2 μ) : ENNReal.ofReal (variance X μ) = evariance X μ := by
rw [variance, ENNReal.ofReal_toReal] exact hX.evariance_lt_top.ne
import Mathlib.Data.Complex.Basic import Mathlib.Data.Real.Sqrt #align_import data.complex.basic from "leanprover-community/mathlib"@"31c24aa72e7b3e5ed97a8412470e904f82b81004" open Set ComplexConjugate namespace Complex namespace AbsTheory -- We develop enough theory to bundle `abs` into an `AbsoluteValue` be...
Mathlib/Data/Complex/Abs.lean
34
34
theorem abs_conj (z : ℂ) : (abs conj z) = abs z := by
simp
import Mathlib.Algebra.Ring.Prod import Mathlib.GroupTheory.OrderOfElement import Mathlib.Tactic.FinCases #align_import data.zmod.basic from "leanprover-community/mathlib"@"74ad1c88c77e799d2fea62801d1dbbd698cff1b7" assert_not_exists Submodule open Function namespace ZMod instance charZero : CharZero (ZMod 0) :=...
Mathlib/Data/ZMod/Basic.lean
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theorem val_natCast {n : ℕ} (a : ℕ) : (a : ZMod n).val = a % n := by
cases n · rw [Nat.mod_zero] exact Int.natAbs_ofNat a · apply Fin.val_natCast
import Mathlib.Analysis.Convex.Between import Mathlib.Analysis.Convex.Jensen import Mathlib.Analysis.Convex.Topology import Mathlib.Analysis.Normed.Group.Pointwise import Mathlib.Analysis.NormedSpace.AddTorsor #align_import analysis.convex.normed from "leanprover-community/mathlib"@"a63928c34ec358b5edcda2bf7513c50052...
Mathlib/Analysis/Convex/Normed.lean
66
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theorem convex_closedBall (a : E) (r : ℝ) : Convex ℝ (Metric.closedBall a r) := by
simpa only [Metric.closedBall, sep_univ] using (convexOn_univ_dist a).convex_le r
import Mathlib.Algebra.Group.Basic import Mathlib.Algebra.Group.Hom.Defs #align_import algebra.hom.group from "leanprover-community/mathlib"@"a148d797a1094ab554ad4183a4ad6f130358ef64" -- `NeZero` cannot be additivised, hence its theory should be developed outside of the -- `Algebra.Group` folder. assert_not_exists...
Mathlib/Algebra/Group/Hom/Basic.lean
110
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theorem comp_mul [Mul M] [CommSemigroup N] [CommSemigroup P] (g : N →ₙ* P) (f₁ f₂ : M →ₙ* N) : g.comp (f₁ * f₂) = g.comp f₁ * g.comp f₂ := by
ext simp only [mul_apply, Function.comp_apply, map_mul, coe_comp]
import Mathlib.Algebra.Algebra.Defs import Mathlib.Algebra.Order.Group.Basic import Mathlib.Algebra.Order.Ring.Basic import Mathlib.RingTheory.Localization.Basic import Mathlib.SetTheory.Game.Birthday import Mathlib.SetTheory.Surreal.Basic #align_import set_theory.surreal.dyadic from "leanprover-community/mathlib"@"9...
Mathlib/SetTheory/Surreal/Dyadic.lean
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theorem add_powHalf_succ_self_eq_powHalf (n) : powHalf (n + 1) + powHalf (n + 1) ≈ powHalf n := by
induction' n using Nat.strong_induction_on with n hn constructor <;> rw [le_iff_forall_lf] <;> constructor · rintro (⟨⟨⟩⟩ | ⟨⟨⟩⟩) <;> apply lf_of_lt · calc 0 + powHalf n.succ ≈ powHalf n.succ := zero_add_equiv _ _ < powHalf n := powHalf_succ_lt_powHalf n · calc powHalf n.succ + 0 ...
import Mathlib.Topology.Order.Basic open Set Filter OrderDual open scoped Topology section OrderClosedTopology variable {α : Type*} [LinearOrder α] [TopologicalSpace α] [OrderClosedTopology α] {a b c d : α} @[simp] theorem nhdsSet_Ioi : 𝓝ˢ (Ioi a) = 𝓟 (Ioi a) := isOpen_Ioi.nhdsSet_eq @[simp] theorem nhdsSet...
Mathlib/Topology/Order/NhdsSet.lean
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theorem nhdsSet_Ico (h : a < b) : 𝓝ˢ (Ico a b) = 𝓝 a ⊔ 𝓟 (Ioo a b) := by
rw [← Ioo_insert_left h, nhdsSet_insert, nhdsSet_Ioo]
import Mathlib.Data.Num.Lemmas import Mathlib.Data.Nat.Prime import Mathlib.Tactic.Ring #align_import data.num.prime from "leanprover-community/mathlib"@"58581d0fe523063f5651df0619be2bf65012a94a" namespace PosNum def minFacAux (n : PosNum) : ℕ → PosNum → PosNum | 0, _ => n | fuel + 1, k => if n < k.bit1...
Mathlib/Data/Num/Prime.lean
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theorem minFac_to_nat (n : PosNum) : (minFac n : ℕ) = Nat.minFac n := by
cases' n with n · rfl · rw [minFac, Nat.minFac_eq, if_neg] swap · simp rw [minFacAux_to_nat] · rfl simp only [cast_one, cast_bit1] unfold _root_.bit1 _root_.bit0 rw [Nat.sqrt_lt] calc (n : ℕ) + (n : ℕ) + 1 ≤ (n : ℕ) + (n : ℕ) + (n : ℕ) := by simp _ = (n : ℕ) * (1 + 1 +...
import Mathlib.Analysis.Calculus.Deriv.Mul import Mathlib.Analysis.Calculus.Deriv.Comp #align_import analysis.calculus.deriv.inv from "leanprover-community/mathlib"@"3bce8d800a6f2b8f63fe1e588fd76a9ff4adcebe" universe u v w open scoped Classical open Topology Filter ENNReal open Filter Asymptotics Set open Cont...
Mathlib/Analysis/Calculus/Deriv/Inv.lean
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theorem fderivWithin_inv (x_ne_zero : x ≠ 0) (hxs : UniqueDiffWithinAt 𝕜 s x) : fderivWithin 𝕜 (fun x => x⁻¹) s x = smulRight (1 : 𝕜 →L[𝕜] 𝕜) (-(x ^ 2)⁻¹) := by
rw [DifferentiableAt.fderivWithin (differentiableAt_inv.2 x_ne_zero) hxs] exact fderiv_inv
import Mathlib.Analysis.Calculus.Deriv.Basic import Mathlib.MeasureTheory.Constructions.BorelSpace.ContinuousLinearMap import Mathlib.MeasureTheory.Covering.BesicovitchVectorSpace import Mathlib.MeasureTheory.Measure.Lebesgue.EqHaar import Mathlib.Analysis.NormedSpace.Pointwise import Mathlib.MeasureTheory.Constructio...
Mathlib/MeasureTheory/Function/Jacobian.lean
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theorem exists_closed_cover_approximatesLinearOn_of_hasFDerivWithinAt [SecondCountableTopology F] (f : E → F) (s : Set E) (f' : E → E →L[ℝ] F) (hf' : ∀ x ∈ s, HasFDerivWithinAt f (f' x) s x) (r : (E →L[ℝ] F) → ℝ≥0) (rpos : ∀ A, r A ≠ 0) : ∃ (t : ℕ → Set E) (A : ℕ → E →L[ℝ] F), (∀ n, IsClosed (t n)) ∧ ...
/- Choose countably many linear maps `f' z`. For every such map, if `f` has a derivative at `x` close enough to `f' z`, then `f y - f x` is well approximated by `f' z (y - x)` for `y` close enough to `x`, say on a ball of radius `r` (or even `u n` for some `n`, where `u` is a fixed sequence tending to `0...
import Mathlib.Data.Fin.Tuple.Basic import Mathlib.Data.List.Join #align_import data.list.of_fn from "leanprover-community/mathlib"@"bf27744463e9620ca4e4ebe951fe83530ae6949b" universe u variable {α : Type u} open Nat namespace List #noalign list.length_of_fn_aux @[simp] theorem length_ofFn_go {n} (f : Fin n ...
Mathlib/Data/List/OfFn.lean
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theorem get_ofFn_go {n} (f : Fin n → α) (i j h) (k) (hk) : get (ofFn.go f i j h) ⟨k, hk⟩ = f ⟨j + k, by simp at hk; omega⟩ := by
let i+1 := i cases k <;> simp [ofFn.go, get_ofFn_go (i := i)] congr 2; omega
import Mathlib.Probability.Kernel.Disintegration.Unique import Mathlib.Probability.Notation #align_import probability.kernel.cond_distrib from "leanprover-community/mathlib"@"00abe0695d8767201e6d008afa22393978bb324d" open MeasureTheory Set Filter TopologicalSpace open scoped ENNReal MeasureTheory ProbabilityTheo...
Mathlib/Probability/Kernel/CondDistrib.lean
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theorem _root_.MeasureTheory.AEStronglyMeasurable.ae_integrable_condDistrib_map_iff (hY : AEMeasurable Y μ) (hf : AEStronglyMeasurable f (μ.map fun a => (X a, Y a))) : (∀ᵐ a ∂μ.map X, Integrable (fun ω => f (a, ω)) (condDistrib Y X μ a)) ∧ Integrable (fun a => ∫ ω, ‖f (a, ω)‖ ∂condDistrib Y X μ a) (μ.map ...
rw [condDistrib, ← hf.ae_integrable_condKernel_iff, Measure.fst_map_prod_mk₀ hY]
import Mathlib.Analysis.Complex.Basic import Mathlib.Analysis.SpecificLimits.Normed open Filter Finset open scoped Topology namespace Complex section StolzSet open Real def stolzSet (M : ℝ) : Set ℂ := {z | ‖z‖ < 1 ∧ ‖1 - z‖ < M * (1 - ‖z‖)} def stolzCone (s : ℝ) : Set ℂ := {z | |z.im| < s * (1 - z.re)}
Mathlib/Analysis/Complex/AbelLimit.lean
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theorem stolzSet_empty {M : ℝ} (hM : M ≤ 1) : stolzSet M = ∅ := by
ext z rw [stolzSet, Set.mem_setOf, Set.mem_empty_iff_false, iff_false, not_and, not_lt, ← sub_pos] intro zn calc _ ≤ 1 * (1 - ‖z‖) := mul_le_mul_of_nonneg_right hM zn.le _ = ‖(1 : ℂ)‖ - ‖z‖ := by rw [one_mul, norm_one] _ ≤ _ := norm_sub_norm_le _ _
import Mathlib.FieldTheory.IsAlgClosed.AlgebraicClosure import Mathlib.RingTheory.IntegralDomain #align_import field_theory.primitive_element from "leanprover-community/mathlib"@"df76f43357840485b9d04ed5dee5ab115d420e87" noncomputable section open scoped Classical Polynomial open FiniteDimensional Polynomial In...
Mathlib/FieldTheory/PrimitiveElement.lean
56
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theorem exists_primitive_element_of_finite_top [Finite E] : ∃ α : E, F⟮α⟯ = ⊤ := by
obtain ⟨α, hα⟩ := @IsCyclic.exists_generator Eˣ _ _ use α rw [eq_top_iff] rintro x - by_cases hx : x = 0 · rw [hx] exact F⟮α.val⟯.zero_mem · obtain ⟨n, hn⟩ := Set.mem_range.mp (hα (Units.mk0 x hx)) simp only at hn rw [show x = α ^ n by norm_cast; rw [hn, Units.val_mk0]] exact zpow_mem (me...
import Mathlib.Algebra.Order.Floor import Mathlib.Topology.Algebra.Order.Group import Mathlib.Topology.Order.Basic #align_import topology.algebra.order.floor from "leanprover-community/mathlib"@"84dc0bd6619acaea625086d6f53cb35cdd554219" open Filter Function Int Set Topology variable {α β γ : Type*} [LinearOrdere...
Mathlib/Topology/Algebra/Order/Floor.lean
108
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theorem tendsto_ceil_right_pure_add_one (n : ℤ) : Tendsto (ceil : α → ℤ) (𝓝[>] n) (pure (n + 1)) := by
simpa only [floor_intCast] using tendsto_ceil_right_pure_floor_add_one (n : α)
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
80
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theorem mem_pi {s : Set (∀ i, α i)} : s ∈ pi f ↔ ∃ I : Set ι, I.Finite ∧ ∃ t : ∀ i, Set (α i), (∀ i, t i ∈ f i) ∧ I.pi t ⊆ s := by
constructor · simp only [pi, mem_iInf', mem_comap, pi_def] rintro ⟨I, If, V, hVf, -, rfl, -⟩ choose t htf htV using hVf exact ⟨I, If, t, htf, iInter₂_mono fun i _ => htV i⟩ · rintro ⟨I, If, t, htf, hts⟩ exact mem_of_superset (pi_mem_pi If fun i _ => htf i) hts
import Mathlib.Algebra.Order.Field.Basic import Mathlib.Algebra.Order.Ring.Rat import Mathlib.Data.Multiset.Sort import Mathlib.Data.PNat.Basic import Mathlib.Data.PNat.Interval import Mathlib.Tactic.NormNum import Mathlib.Tactic.IntervalCases #align_import number_theory.ADE_inequality from "leanprover-community/math...
Mathlib/NumberTheory/ADEInequality.lean
198
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theorem lt_four {q r : ℕ+} (hqr : q ≤ r) (H : 1 < sumInv {2, q, r}) : q < 4 := by
have h4 : (0 : ℚ) < 4 := by norm_num contrapose! H rw [sumInv_pqr] have h4r := H.trans hqr have hq: (q : ℚ)⁻¹ ≤ 4⁻¹ := by rw [inv_le_inv _ h4] · assumption_mod_cast · norm_num have hr: (r : ℚ)⁻¹ ≤ 4⁻¹ := by rw [inv_le_inv _ h4] · assumption_mod_cast · norm_num calc (2⁻¹ + (q :...
import Mathlib.Order.Filter.CountableInter set_option autoImplicit true open Function Set Filter class HasCountableSeparatingOn (α : Type*) (p : Set α → Prop) (t : Set α) : Prop where exists_countable_separating : ∃ S : Set (Set α), S.Countable ∧ (∀ s ∈ S, p s) ∧ ∀ x ∈ t, ∀ y ∈ t, (∀ s ∈ S, x ∈ s ↔ y ∈ s) ...
Mathlib/Order/Filter/CountableSeparatingOn.lean
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theorem HasCountableSeparatingOn.subtype_iff {α : Type*} {p : Set α → Prop} {t : Set α} : HasCountableSeparatingOn t (fun u ↦ ∃ v, p v ∧ (↑) ⁻¹' v = u) univ ↔ HasCountableSeparatingOn α p t := by
constructor <;> intro h · exact h.of_subtype $ fun s ↦ id rcases h with ⟨S, Sct, Sp, hS⟩ use {Subtype.val ⁻¹' s | s ∈ S}, Sct.image _, ?_, ?_ · rintro u ⟨t, tS, rfl⟩ exact ⟨t, Sp _ tS, rfl⟩ rintro x - y - hxy exact Subtype.val_injective $ hS _ (Subtype.coe_prop _) _ (Subtype.coe_prop _) fun s hs ...
import Mathlib.AlgebraicGeometry.AffineScheme import Mathlib.AlgebraicGeometry.Pullbacks import Mathlib.CategoryTheory.MorphismProperty.Limits import Mathlib.Data.List.TFAE #align_import algebraic_geometry.morphisms.basic from "leanprover-community/mathlib"@"434e2fd21c1900747afc6d13d8be7f4eedba7218" set_option lin...
Mathlib/AlgebraicGeometry/Morphisms/Basic.lean
109
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theorem AffineTargetMorphismProperty.respectsIso_mk {P : AffineTargetMorphismProperty} (h₁ : ∀ {X Y Z} (e : X ≅ Y) (f : Y ⟶ Z) [IsAffine Z], P f → P (e.hom ≫ f)) (h₂ : ∀ {X Y Z} (e : Y ≅ Z) (f : X ⟶ Y) [h : IsAffine Y], P f → @P _ _ (f ≫ e.hom) (isAffineOfIso e.inv)) : P.toProperty.RespectsIso := by
constructor · rintro X Y Z e f ⟨a, h⟩; exact ⟨a, h₁ e f h⟩ · rintro X Y Z e f ⟨a, h⟩; exact ⟨isAffineOfIso e.inv, h₂ e f h⟩
import Mathlib.Analysis.Complex.Circle import Mathlib.LinearAlgebra.Determinant import Mathlib.LinearAlgebra.Matrix.GeneralLinearGroup #align_import analysis.complex.isometry from "leanprover-community/mathlib"@"ae690b0c236e488a0043f6faa8ce3546e7f2f9c5" noncomputable section open Complex open ComplexConjugate ...
Mathlib/Analysis/Complex/Isometry.lean
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theorem LinearIsometry.im_apply_eq_im_or_neg_of_re_apply_eq_re {f : ℂ →ₗᵢ[ℝ] ℂ} (h₂ : ∀ z, (f z).re = z.re) (z : ℂ) : (f z).im = z.im ∨ (f z).im = -z.im := by
have h₁ := f.norm_map z simp only [Complex.abs_def, norm_eq_abs] at h₁ rwa [Real.sqrt_inj (normSq_nonneg _) (normSq_nonneg _), normSq_apply (f z), normSq_apply z, h₂, add_left_cancel_iff, mul_self_eq_mul_self_iff] at h₁
import Batteries.Data.List.Basic import Batteries.Data.List.Lemmas open Nat namespace List section countP variable (p q : α → Bool) @[simp] theorem countP_nil : countP p [] = 0 := rfl protected theorem countP_go_eq_add (l) : countP.go p l n = n + countP.go p l 0 := by induction l generalizing n with | nil...
.lake/packages/batteries/Batteries/Data/List/Count.lean
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theorem countP_le_length : countP p l ≤ l.length := by
simp only [countP_eq_length_filter] apply length_filter_le
namespace Nat @[reducible] def Coprime (m n : Nat) : Prop := gcd m n = 1 instance (m n : Nat) : Decidable (Coprime m n) := inferInstanceAs (Decidable (_ = 1)) theorem coprime_iff_gcd_eq_one : Coprime m n ↔ gcd m n = 1 := .rfl theorem Coprime.gcd_eq_one : Coprime m n → gcd m n = 1 := id theorem Coprime.symm ...
.lake/packages/batteries/Batteries/Data/Nat/Gcd.lean
32
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theorem Coprime.dvd_of_dvd_mul_right (H1 : Coprime k n) (H2 : k ∣ m * n) : k ∣ m := by
let t := dvd_gcd (Nat.dvd_mul_left k m) H2 rwa [gcd_mul_left, H1.gcd_eq_one, Nat.mul_one] at t
import Mathlib.CategoryTheory.Galois.GaloisObjects import Mathlib.CategoryTheory.Limits.Shapes.CombinedProducts universe u₁ u₂ w namespace CategoryTheory open Limits Functor variable {C : Type u₁} [Category.{u₂} C] namespace PreGaloisCategory variable [GaloisCategory C] section Decomposition private lemma...
Mathlib/CategoryTheory/Galois/Decomposition.lean
111
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theorem has_decomp_connected_components (X : C) : ∃ (ι : Type) (f : ι → C) (g : (i : ι) → f i ⟶ X) (_ : IsColimit (Cofan.mk X g)), (∀ i, IsConnected (f i)) ∧ Finite ι := by
let F := GaloisCategory.getFiberFunctor C exact has_decomp_connected_components_aux F (Nat.card <| F.obj X) X rfl
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
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theorem add_right [Distrib R] {a x y x' y' : R} (h : SemiconjBy a x y) (h' : SemiconjBy a x' y') : SemiconjBy a (x + x') (y + y') := by
simp only [SemiconjBy, left_distrib, right_distrib, h.eq, h'.eq]
import Mathlib.Algebra.Group.Units import Mathlib.Algebra.GroupWithZero.Basic import Mathlib.Logic.Equiv.Defs import Mathlib.Tactic.Contrapose import Mathlib.Tactic.Nontriviality import Mathlib.Tactic.Spread import Mathlib.Util.AssertExists #align_import algebra.group_with_zero.units.basic from "leanprover-community/...
Mathlib/Algebra/GroupWithZero/Units/Basic.lean
108
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theorem mul_inverse_cancel (x : M₀) (h : IsUnit x) : x * inverse x = 1 := by
rcases h with ⟨u, rfl⟩ rw [inverse_unit, Units.mul_inv]
import Mathlib.Algebra.IsPrimePow import Mathlib.SetTheory.Cardinal.Ordinal import Mathlib.Tactic.WLOG #align_import set_theory.cardinal.divisibility from "leanprover-community/mathlib"@"ea050b44c0f9aba9d16a948c7cc7d2e7c8493567" namespace Cardinal open Cardinal universe u variable {a b : Cardinal.{u}} {n m : ℕ...
Mathlib/SetTheory/Cardinal/Divisibility.lean
137
141
theorem is_prime_iff {a : Cardinal} : Prime a ↔ ℵ₀ ≤ a ∨ ∃ p : ℕ, a = p ∧ p.Prime := by
rcases le_or_lt ℵ₀ a with h | h · simp [h] lift a to ℕ using id h simp [not_le.mpr h]
import Mathlib.Logic.Encodable.Basic import Mathlib.Logic.Pairwise import Mathlib.Data.Set.Subsingleton #align_import logic.encodable.lattice from "leanprover-community/mathlib"@"9003f28797c0664a49e4179487267c494477d853" open Set namespace Encodable variable {α : Type*} {β : Type*} [Encodable β] theorem iSup_de...
Mathlib/Logic/Encodable/Lattice.lean
53
59
theorem iUnion_decode₂_disjoint_on {f : β → Set α} (hd : Pairwise (Disjoint on f)) : Pairwise (Disjoint on fun i => ⋃ b ∈ decode₂ β i, f b) := by
rintro i j ij refine disjoint_left.mpr fun x => ?_ suffices ∀ a, encode a = i → x ∈ f a → ∀ b, encode b = j → x ∉ f b by simpa [decode₂_eq_some] rintro a rfl ha b rfl hb exact (hd (mt (congr_arg encode) ij)).le_bot ⟨ha, hb⟩
import Mathlib.RingTheory.FractionalIdeal.Basic import Mathlib.RingTheory.Ideal.Norm namespace FractionalIdeal open scoped Pointwise nonZeroDivisors variable {R : Type*} [CommRing R] [IsDedekindDomain R] [Module.Free ℤ R] [Module.Finite ℤ R] variable {K : Type*} [CommRing K] [Algebra R K] [IsFractionRing R K]
Mathlib/RingTheory/FractionalIdeal/Norm.lean
36
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theorem absNorm_div_norm_eq_absNorm_div_norm {I : FractionalIdeal R⁰ K} (a : R⁰) (I₀ : Ideal R) (h : a • (I : Submodule R K) = Submodule.map (Algebra.linearMap R K) I₀) : (Ideal.absNorm I.num : ℚ) / |Algebra.norm ℤ (I.den:R)| = (Ideal.absNorm I₀ : ℚ) / |Algebra.norm ℤ (a:R)| := by
rw [div_eq_div_iff] · replace h := congr_arg (I.den • ·) h have h' := congr_arg (a • ·) (den_mul_self_eq_num I) dsimp only at h h' rw [smul_comm] at h rw [h, Submonoid.smul_def, Submonoid.smul_def, ← Submodule.ideal_span_singleton_smul, ← Submodule.ideal_span_singleton_smul, ← Submodule.map_s...
import Mathlib.LinearAlgebra.Dual import Mathlib.LinearAlgebra.Matrix.ToLin #align_import linear_algebra.contraction from "leanprover-community/mathlib"@"657df4339ae6ceada048c8a2980fb10e393143ec" suppress_compilation -- Porting note: universe metavariables behave oddly universe w u v₁ v₂ v₃ v₄ variable {ι : Type...
Mathlib/LinearAlgebra/Contraction.lean
133
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theorem toMatrix_dualTensorHom {m : Type*} {n : Type*} [Fintype m] [Finite n] [DecidableEq m] [DecidableEq n] (bM : Basis m R M) (bN : Basis n R N) (j : m) (i : n) : toMatrix bM bN (dualTensorHom R M N (bM.coord j ⊗ₜ bN i)) = stdBasisMatrix i j 1 := by
ext i' j' by_cases hij : i = i' ∧ j = j' <;> simp [LinearMap.toMatrix_apply, Finsupp.single_eq_pi_single, hij] rw [and_iff_not_or_not, Classical.not_not] at hij cases' hij with hij hij <;> simp [hij]
import Mathlib.Data.Set.Subsingleton import Mathlib.Order.WithBot #align_import data.set.image from "leanprover-community/mathlib"@"001ffdc42920050657fd45bd2b8bfbec8eaaeb29" universe u v open Function Set namespace Set variable {α β γ : Type*} {ι ι' : Sort*} section Preimage variable {f : α → β} {g : β → γ...
Mathlib/Data/Set/Image.lean
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theorem preimage_congr {f g : α → β} {s : Set β} (h : ∀ x : α, f x = g x) : f ⁻¹' s = g ⁻¹' s := by
congr with x simp [h]
import Mathlib.Algebra.Star.Basic import Mathlib.Data.Set.Finite import Mathlib.Data.Set.Pointwise.Basic #align_import algebra.star.pointwise from "leanprover-community/mathlib"@"30413fc89f202a090a54d78e540963ed3de0056e" namespace Set open Pointwise local postfix:max "⋆" => star variable {α : Type*} {s t : Set...
Mathlib/Algebra/Star/Pointwise.lean
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theorem star_subset [InvolutiveStar α] {s t : Set α} : s⋆ ⊆ t ↔ s ⊆ t⋆ := by
rw [← star_subset_star, star_star]
import Mathlib.Analysis.NormedSpace.Exponential import Mathlib.Analysis.NormedSpace.ProdLp import Mathlib.Topology.Instances.TrivSqZeroExt #align_import analysis.normed_space.triv_sq_zero_ext from "leanprover-community/mathlib"@"88a563b158f59f2983cfad685664da95502e8cdd" variable (𝕜 : Type*) {S R M : Type*} loca...
Mathlib/Analysis/NormedSpace/TrivSqZeroExt.lean
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theorem snd_expSeries_of_smul_comm (x : tsze R M) (hx : MulOpposite.op x.fst • x.snd = x.fst • x.snd) (n : ℕ) : snd (expSeries 𝕜 (tsze R M) (n + 1) fun _ => x) = (expSeries 𝕜 R n fun _ => x.fst) • x.snd := by
simp_rw [expSeries_apply_eq, snd_smul, snd_pow_of_smul_comm _ _ hx, nsmul_eq_smul_cast 𝕜 (n + 1), smul_smul, smul_assoc, Nat.factorial_succ, Nat.pred_succ, Nat.cast_mul, mul_inv_rev, inv_mul_cancel_right₀ ((Nat.cast_ne_zero (R := 𝕜)).mpr <| Nat.succ_ne_zero n)]
import Mathlib.Algebra.Group.Subgroup.Basic import Mathlib.Data.Fintype.Basic import Mathlib.Data.List.Sublists import Mathlib.Data.List.InsertNth #align_import group_theory.free_group from "leanprover-community/mathlib"@"f93c11933efbc3c2f0299e47b8ff83e9b539cbf6" open Relation universe u v w variable {α : Type u...
Mathlib/GroupTheory/FreeGroup/Basic.lean
160
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theorem Step.cons_left_iff {a : α} {b : Bool} : Step ((a, b) :: L₁) L₂ ↔ (∃ L, Step L₁ L ∧ L₂ = (a, b) :: L) ∨ L₁ = (a, ! b) :: L₂ := by
constructor · generalize hL : ((a, b) :: L₁ : List _) = L rintro @⟨_ | ⟨p, s'⟩, e, a', b'⟩ · simp at hL simp [*] · simp at hL rcases hL with ⟨rfl, rfl⟩ refine Or.inl ⟨s' ++ e, Step.not, ?_⟩ simp · rintro (⟨L, h, rfl⟩ | rfl) · exact Step.cons h · exact Step.cons_not
import Mathlib.GroupTheory.Submonoid.Inverses import Mathlib.RingTheory.FiniteType import Mathlib.RingTheory.Localization.Basic #align_import ring_theory.localization.inv_submonoid from "leanprover-community/mathlib"@"6e7ca692c98bbf8a64868f61a67fb9c33b10770d" variable {R : Type*} [CommRing R] (M : Submonoid R) (S...
Mathlib/RingTheory/Localization/InvSubmonoid.lean
99
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theorem mem_invSubmonoid_iff_exists_mk' (x : S) : x ∈ invSubmonoid M S ↔ ∃ m : M, mk' S 1 m = x := by
simp_rw [← toInvSubmonoid_eq_mk'] exact ⟨fun h => ⟨_, congr_arg Subtype.val (toInvSubmonoid_surjective M S ⟨x, h⟩).choose_spec⟩, fun h => h.choose_spec ▸ (toInvSubmonoid M S h.choose).prop⟩
import Mathlib.RingTheory.Flat.Basic import Mathlib.LinearAlgebra.TensorProduct.Vanishing import Mathlib.Algebra.Module.FinitePresentation universe u variable {R M : Type u} [CommRing R] [AddCommGroup M] [Module R M] open Classical DirectSum LinearMap TensorProduct Finsupp open scoped BigOperators namespace Modu...
Mathlib/RingTheory/Flat/EquationalCriterion.lean
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theorem isTrivialRelation_iff_vanishesTrivially : IsTrivialRelation f x ↔ VanishesTrivially R f x := by
simp only [IsTrivialRelation, VanishesTrivially, smul_eq_mul, mul_comm]
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
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theorem contMDiff_const : ContMDiff I I' n fun _ : M => c := by
intro x refine ⟨continuousWithinAt_const, ?_⟩ simp only [ContDiffWithinAtProp, (· ∘ ·)] exact contDiffWithinAt_const
import Mathlib.Analysis.SpecificLimits.Basic import Mathlib.RingTheory.Polynomial.Bernstein import Mathlib.Topology.ContinuousFunction.Polynomial import Mathlib.Topology.ContinuousFunction.Compact #align_import analysis.special_functions.bernstein from "leanprover-community/mathlib"@"2c1d8ca2812b64f88992a5294ea3dba14...
Mathlib/Analysis/SpecialFunctions/Bernstein.lean
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theorem variance {n : ℕ} (h : 0 < (n : ℝ)) (x : I) : (∑ k : Fin (n + 1), (x - k/ₙ : ℝ) ^ 2 * bernstein n k x) = (x : ℝ) * (1 - x) / n := by
have h' : (n : ℝ) ≠ 0 := ne_of_gt h apply_fun fun x : ℝ => x * n using GroupWithZero.mul_right_injective h' apply_fun fun x : ℝ => x * n using GroupWithZero.mul_right_injective h' dsimp conv_lhs => simp only [Finset.sum_mul, z] conv_rhs => rw [div_mul_cancel₀ _ h'] have := bernsteinPolynomial.variance ℝ ...
import Mathlib.Data.Fintype.Option import Mathlib.Data.Fintype.Prod import Mathlib.Data.Fintype.Pi import Mathlib.Data.Vector.Basic import Mathlib.Data.PFun import Mathlib.Logic.Function.Iterate import Mathlib.Order.Basic import Mathlib.Tactic.ApplyFun #align_import computability.turing_machine from "leanprover-commu...
Mathlib/Computability/TuringMachine.lean
85
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theorem BlankExtends.trans {Γ} [Inhabited Γ] {l₁ l₂ l₃ : List Γ} : BlankExtends l₁ l₂ → BlankExtends l₂ l₃ → BlankExtends l₁ l₃ := by
rintro ⟨i, rfl⟩ ⟨j, rfl⟩ exact ⟨i + j, by simp [List.replicate_add]⟩
import Mathlib.GroupTheory.QuotientGroup import Mathlib.LinearAlgebra.Span #align_import linear_algebra.quotient from "leanprover-community/mathlib"@"48085f140e684306f9e7da907cd5932056d1aded" -- For most of this file we work over a noncommutative ring section Ring namespace Submodule variable {R M : Type*} {r : ...
Mathlib/LinearAlgebra/Quotient.lean
100
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theorem mk_eq_zero : (mk x : M ⧸ p) = 0 ↔ x ∈ p := by
simpa using (Quotient.eq' p : mk x = 0 ↔ _)
import Mathlib.Algebra.ContinuedFractions.Basic import Mathlib.Algebra.GroupWithZero.Basic #align_import algebra.continued_fractions.translations from "leanprover-community/mathlib"@"a7e36e48519ab281320c4d192da6a7b348ce40ad" namespace GeneralizedContinuedFraction section General variable {α : Type*} {g : Gen...
Mathlib/Algebra/ContinuedFractions/Translations.lean
66
68
theorem exists_s_a_of_part_num {a : α} (nth_part_num_eq : g.partialNumerators.get? n = some a) : ∃ gp, g.s.get? n = some gp ∧ gp.a = a := by
simpa [partialNumerators, Stream'.Seq.map_get?] using nth_part_num_eq
import Mathlib.Order.Filter.EventuallyConst import Mathlib.Order.PartialSups import Mathlib.Algebra.Module.Submodule.IterateMapComap import Mathlib.RingTheory.OrzechProperty import Mathlib.RingTheory.Nilpotent.Lemmas #align_import ring_theory.noetherian from "leanprover-community/mathlib"@"210657c4ea4a4a7b234392f70a3...
Mathlib/RingTheory/Noetherian.lean
136
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theorem isNoetherian_top_iff : IsNoetherian R (⊤ : Submodule R M) ↔ IsNoetherian R M := by
constructor <;> intro h · exact isNoetherian_of_linearEquiv (LinearEquiv.ofTop (⊤ : Submodule R M) rfl) · exact isNoetherian_of_linearEquiv (LinearEquiv.ofTop (⊤ : Submodule R M) rfl).symm
import Mathlib.Analysis.Calculus.ContDiff.Basic import Mathlib.Analysis.Calculus.Deriv.Linear import Mathlib.Analysis.Complex.Conformal import Mathlib.Analysis.Calculus.Conformal.NormedSpace #align_import analysis.complex.real_deriv from "leanprover-community/mathlib"@"3bce8d800a6f2b8f63fe1e588fd76a9ff4adcebe" se...
Mathlib/Analysis/Complex/RealDeriv.lean
99
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theorem HasStrictDerivAt.complexToReal_fderiv' {f : ℂ → E} {x : ℂ} {f' : E} (h : HasStrictDerivAt f f' x) : HasStrictFDerivAt f (reCLM.smulRight f' + I • imCLM.smulRight f') x := by
simpa only [Complex.restrictScalars_one_smulRight'] using h.hasStrictFDerivAt.restrictScalars ℝ
import Mathlib.MeasureTheory.MeasurableSpace.Basic import Mathlib.MeasureTheory.Measure.MeasureSpaceDef #align_import measure_theory.function.ae_measurable_sequence from "leanprover-community/mathlib"@"d003c55042c3cd08aefd1ae9a42ef89441cdaaf3" open MeasureTheory open scoped Classical variable {ι : Sort*} {α β γ...
Mathlib/MeasureTheory/Function/AEMeasurableSequence.lean
100
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theorem measure_compl_aeSeqSet_eq_zero [Countable ι] (hf : ∀ i, AEMeasurable (f i) μ) (hp : ∀ᵐ x ∂μ, p x fun n => f n x) : μ (aeSeqSet hf p)ᶜ = 0 := by
rw [aeSeqSet, compl_compl, measure_toMeasurable] have hf_eq := fun i => (hf i).ae_eq_mk simp_rw [Filter.EventuallyEq, ← ae_all_iff] at hf_eq exact Filter.Eventually.and hf_eq hp
import Mathlib.GroupTheory.Solvable import Mathlib.FieldTheory.PolynomialGaloisGroup import Mathlib.RingTheory.RootsOfUnity.Basic #align_import field_theory.abel_ruffini from "leanprover-community/mathlib"@"e3f4be1fcb5376c4948d7f095bec45350bfb9d1a" noncomputable section open scoped Classical Polynomial Intermedi...
Mathlib/FieldTheory/AbelRuffini.lean
118
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theorem gal_X_pow_sub_C_isSolvable_aux (n : ℕ) (a : F) (h : (X ^ n - 1 : F[X]).Splits (RingHom.id F)) : IsSolvable (X ^ n - C a).Gal := by
by_cases ha : a = 0 · rw [ha, C_0, sub_zero] exact gal_X_pow_isSolvable n have ha' : algebraMap F (X ^ n - C a).SplittingField a ≠ 0 := mt ((injective_iff_map_eq_zero _).mp (RingHom.injective _) a) ha by_cases hn : n = 0 · rw [hn, pow_zero, ← C_1, ← C_sub] exact gal_C_isSolvable (1 - a) have hn...
import Mathlib.LinearAlgebra.Basis.VectorSpace import Mathlib.LinearAlgebra.Dimension.Finite import Mathlib.SetTheory.Cardinal.Subfield import Mathlib.LinearAlgebra.Dimension.RankNullity #align_import linear_algebra.dimension from "leanprover-community/mathlib"@"47a5f8186becdbc826190ced4312f8199f9db6a5" noncomput...
Mathlib/LinearAlgebra/Dimension/DivisionRing.lean
288
300
theorem rank_fun_infinite {ι : Type v} [hι : Infinite ι] : Module.rank K (ι → K) = #(ι → K) := by
obtain ⟨⟨ιK, bK⟩⟩ := Module.Free.exists_basis (R := K) (M := ι → K) obtain ⟨e⟩ := lift_mk_le'.mp ((aleph0_le_mk_iff.mpr hι).trans_eq (lift_uzero #ι).symm) have := LinearMap.lift_rank_le_of_injective _ <| LinearMap.funLeft_injective_of_surjective K K _ (invFun_surjective e.injective) rw [lift_umax.{u,v}, li...
import Mathlib.MeasureTheory.MeasurableSpace.Defs import Mathlib.SetTheory.Cardinal.Cofinality import Mathlib.SetTheory.Cardinal.Continuum #align_import measure_theory.card_measurable_space from "leanprover-community/mathlib"@"f2b108e8e97ba393f22bf794989984ddcc1da89b" universe u variable {α : Type u} open Cardi...
Mathlib/MeasureTheory/MeasurableSpace/Card.lean
74
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theorem iUnion_mem_generateMeasurableRec {s : Set (Set α)} {i : ω₁} {f : ℕ → Set α} (hf : ∀ n, ∃ j < i, f n ∈ generateMeasurableRec s j) : (⋃ n, f n) ∈ generateMeasurableRec s i := by
unfold generateMeasurableRec exact mem_union_right _ ⟨fun n => ⟨f n, let ⟨j, hj, hf⟩ := hf n; mem_iUnion.2 ⟨⟨j, hj⟩, hf⟩⟩, rfl⟩
import Mathlib.Analysis.Calculus.TangentCone import Mathlib.Analysis.NormedSpace.OperatorNorm.Asymptotics #align_import analysis.calculus.fderiv.basic from "leanprover-community/mathlib"@"41bef4ae1254365bc190aee63b947674d2977f01" open Filter Asymptotics ContinuousLinearMap Set Metric open scoped Classical open To...
Mathlib/Analysis/Calculus/FDeriv/Basic.lean
231
233
theorem fderiv_zero_of_not_differentiableAt (h : ¬DifferentiableAt 𝕜 f x) : fderiv 𝕜 f x = 0 := by
have : ¬∃ f', HasFDerivAt f f' x := h simp [fderiv, this]
import Mathlib.Analysis.InnerProductSpace.Basic import Mathlib.Analysis.NormedSpace.Dual import Mathlib.MeasureTheory.Function.StronglyMeasurable.Lp import Mathlib.MeasureTheory.Integral.SetIntegral #align_import measure_theory.function.ae_eq_of_integral from "leanprover-community/mathlib"@"915591b2bb3ea303648db07284...
Mathlib/MeasureTheory/Function/AEEqOfIntegral.lean
260
284
theorem ae_nonneg_of_forall_setIntegral_nonneg_of_stronglyMeasurable (hfm : StronglyMeasurable f) (hf : Integrable f μ) (hf_zero : ∀ s, MeasurableSet s → μ s < ∞ → 0 ≤ ∫ x in s, f x ∂μ) : 0 ≤ᵐ[μ] f := by
simp_rw [EventuallyLE, Pi.zero_apply] rw [ae_const_le_iff_forall_lt_measure_zero] intro b hb_neg let s := {x | f x ≤ b} have hs : MeasurableSet s := hfm.measurableSet_le stronglyMeasurable_const have mus : μ s < ∞ := Integrable.measure_le_lt_top hf hb_neg have h_int_gt : (∫ x in s, f x ∂μ) ≤ b * (μ s).to...
import Mathlib.Control.Monad.Basic import Mathlib.Control.Monad.Writer import Mathlib.Init.Control.Lawful #align_import control.monad.cont from "leanprover-community/mathlib"@"d6814c584384ddf2825ff038e868451a7c956f31" universe u v w u₀ u₁ v₀ v₁ structure MonadCont.Label (α : Type w) (m : Type u → Type v) (β : Typ...
Mathlib/Control/Monad/Cont.lean
101
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theorem monadLift_bind [Monad m] [LawfulMonad m] {α β} (x : m α) (f : α → m β) : (monadLift (x >>= f) : ContT r m β) = monadLift x >>= monadLift ∘ f := by
ext simp only [monadLift, MonadLift.monadLift, (· ∘ ·), (· >>= ·), bind_assoc, id, run, ContT.monadLift]
import Mathlib.AlgebraicTopology.SimplicialObject import Mathlib.CategoryTheory.Limits.Shapes.Products #align_import algebraic_topology.split_simplicial_object from "leanprover-community/mathlib"@"dd1f8496baa505636a82748e6b652165ea888733" noncomputable section open CategoryTheory CategoryTheory.Category Category...
Mathlib/AlgebraicTopology/SplitSimplicialObject.lean
162
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theorem eqId_iff_mono : A.EqId ↔ Mono A.e := by
constructor · intro h dsimp at h subst h dsimp only [id, e] infer_instance · intro h rw [eqId_iff_len_le] exact len_le_of_mono h
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
112
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theorem isPiSystem_iUnion_of_directed_le {α ι} (p : ι → Set (Set α)) (hp_pi : ∀ n, IsPiSystem (p n)) (hp_directed : Directed (· ≤ ·) p) : IsPiSystem (⋃ n, p n) := by
intro t1 ht1 t2 ht2 h rw [Set.mem_iUnion] at ht1 ht2 ⊢ cases' ht1 with n ht1 cases' ht2 with m ht2 obtain ⟨k, hpnk, hpmk⟩ : ∃ k, p n ≤ p k ∧ p m ≤ p k := hp_directed n m exact ⟨k, hp_pi k t1 (hpnk ht1) t2 (hpmk ht2) h⟩
import Mathlib.Algebra.Lie.Matrix import Mathlib.LinearAlgebra.Matrix.SesquilinearForm import Mathlib.Tactic.NoncommRing #align_import algebra.lie.skew_adjoint from "leanprover-community/mathlib"@"075b3f7d19b9da85a0b54b3e33055a74fc388dec" universe u v w w₁ section SkewAdjointEndomorphisms open LinearMap (BilinF...
Mathlib/Algebra/Lie/SkewAdjoint.lean
84
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theorem skewAdjointLieSubalgebraEquiv_symm_apply (f : skewAdjointLieSubalgebra B) : ↑((skewAdjointLieSubalgebraEquiv B e).symm f) = e.symm.lieConj f := by
simp [skewAdjointLieSubalgebraEquiv]
import Mathlib.Algebra.Order.Group.TypeTags import Mathlib.FieldTheory.RatFunc.Degree import Mathlib.RingTheory.DedekindDomain.IntegralClosure import Mathlib.RingTheory.IntegrallyClosed import Mathlib.Topology.Algebra.ValuedField #align_import number_theory.function_field from "leanprover-community/mathlib"@"70fd9563...
Mathlib/NumberTheory/FunctionField.lean
113
121
theorem algebraMap_injective : Function.Injective (⇑(algebraMap Fq[X] (ringOfIntegers Fq F))) := by
have hinj : Function.Injective (⇑(algebraMap Fq[X] F)) := by rw [IsScalarTower.algebraMap_eq Fq[X] (RatFunc Fq) F] exact (algebraMap (RatFunc Fq) F).injective.comp (IsFractionRing.injective Fq[X] (RatFunc Fq)) rw [injective_iff_map_eq_zero (algebraMap Fq[X] (↥(ringOfIntegers Fq F)))] intro p hp rw [← S...
import Mathlib.Dynamics.Flow import Mathlib.Tactic.Monotonicity #align_import dynamics.omega_limit from "leanprover-community/mathlib"@"f2ce6086713c78a7f880485f7917ea547a215982" open Set Function Filter Topology section omegaLimit variable {τ : Type*} {α : Type*} {β : Type*} {ι : Type*} def omegaLimit [Topol...
Mathlib/Dynamics/OmegaLimit.lean
150
152
theorem mem_omegaLimit_singleton_iff_map_cluster_point (x : α) (y : β) : y ∈ ω f ϕ {x} ↔ MapClusterPt y f fun t ↦ ϕ t x := by
simp_rw [mem_omegaLimit_iff_frequently, mapClusterPt_iff, singleton_inter_nonempty, mem_preimage]
import Mathlib.CategoryTheory.Abelian.Opposite import Mathlib.CategoryTheory.Limits.Preserves.Shapes.Zero import Mathlib.CategoryTheory.Limits.Preserves.Shapes.Kernels import Mathlib.CategoryTheory.Preadditive.LeftExact import Mathlib.CategoryTheory.Adjunction.Limits import Mathlib.Algebra.Homology.Exact import Mathli...
Mathlib/CategoryTheory/Abelian/Exact.lean
57
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theorem exact_iff_image_eq_kernel : Exact f g ↔ imageSubobject f = kernelSubobject g := by
constructor · intro h have : IsIso (imageToKernel f g h.w) := have := h.epi; isIso_of_mono_of_epi _ refine Subobject.eq_of_comm (asIso (imageToKernel _ _ h.w)) ?_ simp · apply exact_of_image_eq_kernel
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
85
93
theorem finite_product_eq_finset_inf [SemilatticeInf α] [OrderTop α] {ι : Type u} [Fintype ι] (f : ι → α) : ∏ᶜ f = Fintype.elems.inf f := by
trans · exact (IsLimit.conePointUniqueUpToIso (limit.isLimit _) (finiteLimitCone (Discrete.functor f)).isLimit).to_eq change Finset.univ.inf (f ∘ discreteEquiv.toEmbedding) = Fintype.elems.inf f simp only [← Finset.inf_map, Finset.univ_map_equiv_to_embedding] rfl
import Mathlib.SetTheory.Cardinal.Finite #align_import data.set.ncard from "leanprover-community/mathlib"@"74c2af38a828107941029b03839882c5c6f87a04" namespace Set variable {α β : Type*} {s t : Set α} noncomputable def encard (s : Set α) : ℕ∞ := PartENat.withTopEquiv (PartENat.card s) @[simp] theorem encard_uni...
Mathlib/Data/Set/Card.lean
85
88
theorem Infinite.encard_eq {s : Set α} (h : s.Infinite) : s.encard = ⊤ := by
have := h.to_subtype rw [encard, ← PartENat.withTopEquiv.symm.injective.eq_iff, Equiv.symm_apply_apply, PartENat.withTopEquiv_symm_top, PartENat.card_eq_top_of_infinite]
import Mathlib.Topology.Algebra.InfiniteSum.Basic import Mathlib.Topology.Algebra.UniformGroup noncomputable section open Filter Finset Function open scoped Topology variable {α β γ δ : Type*} section TopologicalGroup variable [CommGroup α] [TopologicalSpace α] [TopologicalGroup α] variable {f g : β → α} {a a₁...
Mathlib/Topology/Algebra/InfiniteSum/Group.lean
91
96
theorem HasProd.hasProd_compl_iff {s : Set β} (hf : HasProd (f ∘ (↑) : s → α) a₁) : HasProd (f ∘ (↑) : ↑sᶜ → α) a₂ ↔ HasProd f (a₁ * a₂) := by
refine ⟨fun h ↦ hf.mul_compl h, fun h ↦ ?_⟩ rw [hasProd_subtype_iff_mulIndicator] at hf ⊢ rw [Set.mulIndicator_compl] simpa only [div_eq_mul_inv, mul_inv_cancel_comm] using h.div hf
import Mathlib.Order.ConditionallyCompleteLattice.Basic import Mathlib.Order.LatticeIntervals import Mathlib.Order.Interval.Set.OrdConnected #align_import order.complete_lattice_intervals from "leanprover-community/mathlib"@"207cfac9fcd06138865b5d04f7091e46d9320432" open scoped Classical open Set variable {ι : ...
Mathlib/Order/CompleteLatticeIntervals.lean
57
59
theorem subset_sSup_of_within [Inhabited s] {t : Set s} (h' : t.Nonempty) (h'' : BddAbove t) (h : sSup ((↑) '' t : Set α) ∈ s) : sSup ((↑) '' t : Set α) = (@sSup s _ t : α) := by
simp [dif_pos, h, h', h'']
import Mathlib.AlgebraicTopology.DoldKan.GammaCompN import Mathlib.AlgebraicTopology.DoldKan.NReflectsIso #align_import algebraic_topology.dold_kan.n_comp_gamma from "leanprover-community/mathlib"@"32a7e535287f9c73f2e4d2aef306a39190f0b504" noncomputable section open CategoryTheory CategoryTheory.Category Categor...
Mathlib/AlgebraicTopology/DoldKan/NCompGamma.lean
38
78
theorem PInfty_comp_map_mono_eq_zero (X : SimplicialObject C) {n : ℕ} {Δ' : SimplexCategory} (i : Δ' ⟶ [n]) [hi : Mono i] (h₁ : Δ'.len ≠ n) (h₂ : ¬Isδ₀ i) : PInfty.f n ≫ X.map i.op = 0 := by
induction' Δ' using SimplexCategory.rec with m obtain ⟨k, hk⟩ := Nat.exists_eq_add_of_lt (len_lt_of_mono i fun h => by rw [← h] at h₁ exact h₁ rfl) simp only [len_mk] at hk rcases k with _|k · change n = m + 1 at hk subst hk obtain ⟨j, rfl⟩ := eq_δ_of_mono i rw [Isδ₀.iff] at h₂ ...
import Mathlib.Analysis.InnerProductSpace.Basic import Mathlib.Analysis.SpecialFunctions.Trigonometric.Inverse #align_import geometry.euclidean.angle.unoriented.basic from "leanprover-community/mathlib"@"46b633fd842bef9469441c0209906f6dddd2b4f5" assert_not_exists HasFDerivAt assert_not_exists ConformalAt noncom...
Mathlib/Geometry/Euclidean/Angle/Unoriented/Basic.lean
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theorem angle_zero_right (x : V) : angle x 0 = π / 2 := by
unfold angle rw [inner_zero_right, zero_div, Real.arccos_zero]
import Mathlib.Data.Countable.Basic import Mathlib.Data.Fin.VecNotation import Mathlib.Order.Disjointed import Mathlib.MeasureTheory.OuterMeasure.Defs #align_import measure_theory.measure.outer_measure from "leanprover-community/mathlib"@"343e80208d29d2d15f8050b929aa50fe4ce71b55" noncomputable section open Set F...
Mathlib/MeasureTheory/OuterMeasure/Basic.lean
103
107
theorem measure_biUnion_null_iff {I : Set ι} (hI : I.Countable) {s : ι → Set α} : μ (⋃ i ∈ I, s i) = 0 ↔ ∀ i ∈ I, μ (s i) = 0 := by
refine ⟨fun h i hi ↦ measure_mono_null (subset_biUnion_of_mem hi) h, fun h ↦ ?_⟩ have _ := hI.to_subtype simpa [h] using measure_iUnion_le (μ := μ) fun x : I ↦ s x
import Mathlib.LinearAlgebra.Matrix.Charpoly.Coeff import Mathlib.LinearAlgebra.Matrix.ToLin import Mathlib.RingTheory.PowerBasis #align_import linear_algebra.matrix.charpoly.minpoly from "leanprover-community/mathlib"@"7ae139f966795f684fc689186f9ccbaedd31bf31" noncomputable section universe u v w open Polynomi...
Mathlib/LinearAlgebra/Matrix/Charpoly/Minpoly.lean
83
92
theorem charpoly_leftMulMatrix {S : Type*} [Ring S] [Algebra R S] (h : PowerBasis R S) : (leftMulMatrix h.basis h.gen).charpoly = minpoly R h.gen := by
cases subsingleton_or_nontrivial R; · apply Subsingleton.elim apply minpoly.unique' R h.gen (charpoly_monic _) · apply (injective_iff_map_eq_zero (G := S) (leftMulMatrix _)).mp (leftMulMatrix_injective h.basis) rw [← Polynomial.aeval_algHom_apply, aeval_self_charpoly] refine fun q hq => or_iff_not_im...
import Mathlib.Topology.Algebra.InfiniteSum.Basic import Mathlib.Topology.Algebra.UniformGroup noncomputable section open Filter Finset Function open scoped Topology variable {α β γ δ : Type*} section TopologicalGroup variable [CommGroup α] [TopologicalSpace α] [TopologicalGroup α] variable {f g : β → α} {a a₁...
Mathlib/Topology/Algebra/InfiniteSum/Group.lean
30
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theorem HasProd.inv (h : HasProd f a) : HasProd (fun b ↦ (f b)⁻¹) a⁻¹ := by
simpa only using h.map (MonoidHom.id α)⁻¹ continuous_inv
import Mathlib.CategoryTheory.Sites.Sieves import Mathlib.CategoryTheory.Limits.Shapes.Pullbacks import Mathlib.CategoryTheory.Limits.Shapes.Multiequalizer import Mathlib.CategoryTheory.Category.Preorder import Mathlib.Order.Copy import Mathlib.Data.Set.Subsingleton #align_import category_theory.sites.grothendieck fr...
Mathlib/CategoryTheory/Sites/Grothendieck.lean
191
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theorem arrow_max (f : Y ⟶ X) (S : Sieve X) (hf : S f) : J.Covers S f := by
rw [Covers, (Sieve.pullback_eq_top_iff_mem f).1 hf] apply J.top_mem
import Mathlib.Analysis.Normed.Group.Basic #align_import information_theory.hamming from "leanprover-community/mathlib"@"17ef379e997badd73e5eabb4d38f11919ab3c4b3" section HammingDistNorm open Finset Function variable {α ι : Type*} {β : ι → Type*} [Fintype ι] [∀ i, DecidableEq (β i)] variable {γ : ι → Type*} [∀ ...
Mathlib/InformationTheory/Hamming.lean
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theorem eq_of_hammingDist_eq_zero {x y : ∀ i, β i} : hammingDist x y = 0 → x = y := by
simp_rw [hammingDist, card_eq_zero, filter_eq_empty_iff, Classical.not_not, funext_iff, mem_univ, forall_true_left, imp_self]
import Mathlib.Algebra.Polynomial.AlgebraMap import Mathlib.Algebra.Polynomial.BigOperators import Mathlib.Algebra.Polynomial.Degree.Lemmas import Mathlib.Algebra.Polynomial.Div #align_import data.polynomial.ring_division from "leanprover-community/mathlib"@"8efcf8022aac8e01df8d302dcebdbc25d6a886c8" noncomputable ...
Mathlib/Algebra/Polynomial/RingDivision.lean
148
153
theorem degree_le_mul_left (p : R[X]) (hq : q ≠ 0) : degree p ≤ degree (p * q) := by
classical exact if hp : p = 0 then by simp only [hp, zero_mul, le_refl] else by rw [degree_mul, degree_eq_natDegree hp, degree_eq_natDegree hq]; exact WithBot.coe_le_coe.2 (Nat.le_add_right _ _)
import Mathlib.Analysis.SpecialFunctions.Trigonometric.Bounds #align_import data.real.pi.bounds from "leanprover-community/mathlib"@"402f8982dddc1864bd703da2d6e2ee304a866973" -- Porting note: needed to add a lot of type ascriptions for lean to interpret numbers as reals. open scoped Real namespace Real theorem ...
Mathlib/Data/Real/Pi/Bounds.lean
85
93
theorem sqrtTwoAddSeries_step_up (c d : ℕ) {a b n : ℕ} {z : ℝ} (hz : sqrtTwoAddSeries (c / d) n ≤ z) (hb : 0 < b) (hd : 0 < d) (h : (2 * b + a) * d ^ 2 ≤ c ^ 2 * b) : sqrtTwoAddSeries (a / b) (n + 1) ≤ z := by
refine le_trans ?_ hz; rw [sqrtTwoAddSeries_succ]; apply sqrtTwoAddSeries_monotone_left have hb' : 0 < (b : ℝ) := Nat.cast_pos.2 hb have hd' : 0 < (d : ℝ) := Nat.cast_pos.2 hd rw [sqrt_le_left (div_nonneg c.cast_nonneg d.cast_nonneg), div_pow, add_div_eq_mul_add_div _ _ (ne_of_gt hb'), div_le_div_iff hb' (...
import Mathlib.AlgebraicTopology.DoldKan.FunctorN import Mathlib.AlgebraicTopology.DoldKan.Decomposition import Mathlib.CategoryTheory.Idempotents.HomologicalComplex import Mathlib.CategoryTheory.Idempotents.KaroubiKaroubi #align_import algebraic_topology.dold_kan.n_reflects_iso from "leanprover-community/mathlib"@"3...
Mathlib/AlgebraicTopology/DoldKan/NReflectsIso.lean
68
92
theorem compatibility_N₂_N₁_karoubi : N₂ ⋙ (karoubiChainComplexEquivalence C ℕ).functor = karoubiFunctorCategoryEmbedding SimplexCategoryᵒᵖ C ⋙ N₁ ⋙ (karoubiChainComplexEquivalence (Karoubi C) ℕ).functor ⋙ Functor.mapHomologicalComplex (KaroubiKaroubi.equivalence C).inverse _ := by
refine CategoryTheory.Functor.ext (fun P => ?_) fun P Q f => ?_ · refine HomologicalComplex.ext ?_ ?_ · ext n · rfl · dsimp simp only [karoubi_PInfty_f, comp_id, PInfty_f_naturality, id_comp, eqToHom_refl] · rintro _ n (rfl : n + 1 = _) ext have h := (AlternatingFaceMapCompl...
import Mathlib.Data.List.Lattice import Mathlib.Data.List.Range import Mathlib.Data.Bool.Basic #align_import data.list.intervals from "leanprover-community/mathlib"@"7b78d1776212a91ecc94cf601f83bdcc46b04213" open Nat namespace List def Ico (n m : ℕ) : List ℕ := range' n (m - n) #align list.Ico List.Ico names...
Mathlib/Data/List/Intervals.lean
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theorem inter_consecutive (n m l : ℕ) : Ico n m ∩ Ico m l = [] := by
apply eq_nil_iff_forall_not_mem.2 intro a simp only [and_imp, not_and, not_lt, List.mem_inter_iff, List.Ico.mem] intro _ h₂ h₃ exfalso exact not_lt_of_ge h₃ h₂
import Mathlib.Algebra.Polynomial.AlgebraMap import Mathlib.Algebra.Polynomial.BigOperators import Mathlib.Algebra.Polynomial.Degree.Lemmas import Mathlib.Algebra.Polynomial.Div #align_import data.polynomial.ring_division from "leanprover-community/mathlib"@"8efcf8022aac8e01df8d302dcebdbc25d6a886c8" noncomputable ...
Mathlib/Algebra/Polynomial/RingDivision.lean
190
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theorem natDegree_sub_eq_of_prod_eq {p₁ p₂ q₁ q₂ : R[X]} (hp₁ : p₁ ≠ 0) (hq₁ : q₁ ≠ 0) (hp₂ : p₂ ≠ 0) (hq₂ : q₂ ≠ 0) (h_eq : p₁ * q₂ = p₂ * q₁) : (p₁.natDegree : ℤ) - q₁.natDegree = (p₂.natDegree : ℤ) - q₂.natDegree := by
rw [sub_eq_sub_iff_add_eq_add] norm_cast rw [← natDegree_mul hp₁ hq₂, ← natDegree_mul hp₂ hq₁, h_eq]
import Mathlib.CategoryTheory.Limits.Shapes.Pullbacks import Mathlib.CategoryTheory.Limits.Shapes.BinaryProducts import Mathlib.CategoryTheory.Limits.Preserves.Shapes.Pullbacks #align_import category_theory.limits.constructions.epi_mono from "leanprover-community/mathlib"@"f7baecbb54bd0f24f228576f97b1752fc3c9b318" ...
Mathlib/CategoryTheory/Limits/Constructions/EpiMono.lean
45
49
theorem reflects_mono_of_reflectsLimit {X Y : C} (f : X ⟶ Y) [ReflectsLimit (cospan f f) F] [Mono (F.map f)] : Mono f := by
have := PullbackCone.isLimitMkIdId (F.map f) simp_rw [← F.map_id] at this apply PullbackCone.mono_of_isLimitMkIdId _ (isLimitOfIsLimitPullbackConeMap F _ this)
import Mathlib.Analysis.Quaternion import Mathlib.Analysis.NormedSpace.Exponential import Mathlib.Analysis.SpecialFunctions.Trigonometric.Series #align_import analysis.normed_space.quaternion_exponential from "leanprover-community/mathlib"@"f0c8bf9245297a541f468be517f1bde6195105e9" open scoped Quaternion Nat open...
Mathlib/Analysis/NormedSpace/QuaternionExponential.lean
117
118
theorem im_exp (q : ℍ[ℝ]) : (exp ℝ q).im = (exp ℝ q.re * (Real.sin ‖q.im‖ / ‖q.im‖)) • q.im := by
simp [exp_eq, smul_smul]
import Mathlib.Data.Fin.Fin2 import Mathlib.Data.PFun import Mathlib.Data.Vector3 import Mathlib.NumberTheory.PellMatiyasevic #align_import number_theory.dioph from "leanprover-community/mathlib"@"a66d07e27d5b5b8ac1147cacfe353478e5c14002" open Fin2 Function Nat Sum local infixr:67 " ::ₒ " => Option.elim' local ...
Mathlib/NumberTheory/Dioph.lean
89
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theorem IsPoly.add {f g : (α → ℕ) → ℤ} (hf : IsPoly f) (hg : IsPoly g) : IsPoly (f + g) := by
rw [← sub_neg_eq_add]; exact hf.sub hg.neg
import Mathlib.CategoryTheory.Limits.Shapes.Pullbacks import Mathlib.CategoryTheory.Limits.Shapes.ZeroMorphisms import Mathlib.CategoryTheory.Limits.Constructions.BinaryProducts #align_import category_theory.limits.constructions.zero_objects from "leanprover-community/mathlib"@"52a270e2ea4e342c2587c106f8be904524214a4...
Mathlib/CategoryTheory/Limits/Constructions/ZeroObjects.lean
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theorem zeroProdIso_inv_snd (X : C) : (zeroProdIso X).inv ≫ prod.snd = 𝟙 X := by
dsimp [zeroProdIso, binaryFanZeroLeft] simp
import Mathlib.Data.Multiset.Nodup #align_import data.multiset.sum from "leanprover-community/mathlib"@"9003f28797c0664a49e4179487267c494477d853" open Sum namespace Multiset variable {α β : Type*} (s : Multiset α) (t : Multiset β) def disjSum : Multiset (Sum α β) := s.map inl + t.map inr #align multiset.dis...
Mathlib/Data/Multiset/Sum.lean
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theorem mem_disjSum : x ∈ s.disjSum t ↔ (∃ a, a ∈ s ∧ inl a = x) ∨ ∃ b, b ∈ t ∧ inr b = x := by
simp_rw [disjSum, mem_add, mem_map]
import Mathlib.Algebra.DirectSum.Finsupp import Mathlib.LinearAlgebra.Finsupp import Mathlib.LinearAlgebra.DirectSum.TensorProduct #align_import linear_algebra.direct_sum.finsupp from "leanprover-community/mathlib"@"9b9d125b7be0930f564a68f1d73ace10cf46064d" noncomputable section open DirectSum TensorProduct ope...
Mathlib/LinearAlgebra/DirectSum/Finsupp.lean
315
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theorem finsuppTensorFinsuppRid_apply_apply (f : ι →₀ M) (g : κ →₀ R) (a : ι) (b : κ) : finsuppTensorFinsuppRid R M ι κ (f ⊗ₜ[R] g) (a, b) = g b • f a := by
simp [finsuppTensorFinsuppRid]
import Mathlib.Analysis.SpecialFunctions.Trigonometric.Bounds #align_import data.real.pi.bounds from "leanprover-community/mathlib"@"402f8982dddc1864bd703da2d6e2ee304a866973" -- Porting note: needed to add a lot of type ascriptions for lean to interpret numbers as reals. open scoped Real namespace Real theorem ...
Mathlib/Data/Real/Pi/Bounds.lean
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theorem pi_lower_bound_start (n : ℕ) {a} (h : sqrtTwoAddSeries ((0 : ℕ) / (1 : ℕ)) n ≤ (2 : ℝ) - (a / (2 : ℝ) ^ (n + 1)) ^ 2) : a < π := by
refine lt_of_le_of_lt ?_ (pi_gt_sqrtTwoAddSeries n); rw [mul_comm] refine (div_le_iff (pow_pos (by norm_num) _ : (0 : ℝ) < _)).mp (le_sqrt_of_sq_le ?_) rwa [le_sub_comm, show (0 : ℝ) = (0 : ℕ) / (1 : ℕ) by rw [Nat.cast_zero, zero_div]]
import Mathlib.Algebra.Regular.Basic import Mathlib.LinearAlgebra.Matrix.MvPolynomial import Mathlib.LinearAlgebra.Matrix.Polynomial import Mathlib.RingTheory.Polynomial.Basic #align_import linear_algebra.matrix.adjugate from "leanprover-community/mathlib"@"a99f85220eaf38f14f94e04699943e185a5e1d1a" namespace Matr...
Mathlib/LinearAlgebra/Matrix/Adjugate.lean
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theorem cramer_transpose_apply (i : n) : cramer Aᵀ b i = (A.updateRow i b).det := by
rw [cramer_apply, updateColumn_transpose, det_transpose]
import Mathlib.NumberTheory.DirichletCharacter.Bounds import Mathlib.NumberTheory.EulerProduct.Basic import Mathlib.NumberTheory.LSeries.Basic import Mathlib.NumberTheory.LSeries.RiemannZeta open Complex variable {s : ℂ} noncomputable def riemannZetaSummandHom (hs : s ≠ 0) : ℕ →*₀ ℂ where toFun n := (n : ℂ) ^ ...
Mathlib/NumberTheory/EulerProduct/DirichletLSeries.lean
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theorem riemannZeta_eulerProduct_hasProd (hs : 1 < s.re) : HasProd (fun p : Primes ↦ (1 - (p : ℂ) ^ (-s))⁻¹) (riemannZeta s) := by
rw [← tsum_riemannZetaSummand hs] apply eulerProduct_completely_multiplicative_hasProd <| summable_riemannZetaSummand hs
import Mathlib.NumberTheory.Cyclotomic.Embeddings import Mathlib.NumberTheory.Cyclotomic.Rat import Mathlib.NumberTheory.NumberField.Units.DirichletTheorem open NumberField Units InfinitePlace nonZeroDivisors Polynomial namespace IsCyclotomicExtension.Rat.Three variable {K : Type*} [Field K] [NumberField K] [IsC...
Mathlib/NumberTheory/Cyclotomic/Three.lean
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theorem Units.mem : u ∈ [1, -1, η, -η, η ^ 2, -η ^ 2] := by
have hrank : rank K = 0 := by dsimp only [rank] rw [card_eq_nrRealPlaces_add_nrComplexPlaces, nrRealPlaces_eq_zero (n := 3) K (by decide), zero_add, nrComplexPlaces_eq_totient_div_two (n := 3)] rfl obtain ⟨⟨x, e⟩, hxu, -⟩ := exist_unique_eq_mul_prod _ u replace hxu : u = x := by rw [← mul_o...