mathlib-initiative/mathlib-tactics huggingface dataset:
Module: Mathlib.CategoryTheory.Monad.Limits

Goal state before:
pp: C : Type u₁
inst✝⁵ : Category.{v₁, u₁} C
D✝ : Type u₂
inst✝⁴ : Category.{v₂, u₂} D✝
J : Type u
inst✝³ : Category.{v, u} J
T : Comonad C
D : J ⥤ T.Coalgebra
c : Cone (D ⋙ T.forget)
t : IsLimit c
inst✝² : PreservesLimit (D ⋙ T.forget) T.toFunctor
inst✝¹ : PreservesLimit ((D ⋙ T.forget) ⋙ T.toFunctor) T.toFunctor
inst✝ : PreservesColimit ((D ⋙ T.forget) ⋙ T.toFunctor) T.toFunctor
s : Cone D
j : J
⊢ s.pt.a ≫ T.map (t.lift (T.forget.mapCone s)) ≫ T.map (c.π.app j) =
    t.lift (T.forget.mapCone s) ≫ lambda c t ≫ T.map (c.π.app j)

Tactic:
commuting,

Goal state after:
C : Type u₁
inst✝⁵ : Category.{v₁, u₁} C
D✝ : Type u₂
inst✝⁴ : Category.{v₂, u₂} D✝
J : Type u
inst✝³ : Category.{v, u} J
T : Comonad C
D : J ⥤ T.Coalgebra
c : Cone (D ⋙ T.forget)
t : IsLimit c
inst✝² : PreservesLimit (D ⋙ T.forget) T.toFunctor
inst✝¹ : PreservesLimit ((D ⋙ T.forget) ⋙ T.toFunctor) T.toFunctor
inst✝ : PreservesColimit ((D ⋙ T.forget) ⋙ T.toFunctor) T.toFunctor
s : Cone D
j : J
⊢ s.pt.a ≫ T.map (t.lift (T.forget.mapCone s)) ≫ T.map (c.π.app j) =
    t.lift (T.forget.mapCone s) ≫ c.π.app j ≫ (D.obj j).a
Module: Mathlib.CategoryTheory.Monad.Limits

Goal state before:
pp: C : Type u₁
inst✝⁵ : Category.{v₁, u₁} C
D : Type u₂
inst✝⁴ : Category.{v₂, u₂} D
J : Type u
inst✝³ : Category.{v, u} J
R : D ⥤ C
K : J ⥤ D
inst✝² : ComonadicLeftAdjoint R
inst✝¹ : PreservesLimit (K ⋙ R) (comonadicRightAdjoint R ⋙ R)
inst✝ : PreservesLimit ((K ⋙ R) ⋙ comonadicRightAdjoint R ⋙ R) (comonadicRightAdjoint R ⋙ R)
⊢ CreatesLimit K R

Tactic:
letI A := Comonad.comparison (comonadicAdjunction R)

Goal state after:
C : Type u₁
inst✝⁵ : Category.{v₁, u₁} C
D : Type u₂
inst✝⁴ : Category.{v₂, u₂} D
J : Type u
inst✝³ : Category.{v, u} J
R : D ⥤ C
K : J ⥤ D
inst✝² : ComonadicLeftAdjoint R
inst✝¹ : PreservesLimit (K ⋙ R) (comonadicRightAdjoint R ⋙ R)
inst✝ : PreservesLimit ((K ⋙ R) ⋙ comonadicRightAdjoint R ⋙ R) (comonadicRightAdjoint R ⋙ R)
A : D ⥤ (comonadicAdjunction R).toComonad.Coalgebra := Comonad.comparison (comonadicAdjunction R)
⊢ CreatesLimit K R
Module: Mathlib.RingTheory.Ideal.Pointwise

Goal state before:
pp: M : Type u_1
R : Type u_3
inst✝² : Group M
inst✝¹ : Semiring R
inst✝ : MulSemiringAction M R
a : M
S : Ideal R
x : R
h : a⁻¹ • x ∈ S
⊢ x ∈ a • S

Tactic:
simpa using smul_mem_pointwise_smul a _ _ h

Goal state after:
Module: Mathlib.RingTheory.Ideal.Over

Goal state before:
pp: R✝ : Type u_1
inst✝¹⁴ : CommRing R✝
R : Type u_2
inst✝¹³ : CommSemiring R
A : Type u_3
B : Type u_4
C : Type u_5
inst✝¹² : CommRing A
inst✝¹¹ : CommRing B
inst✝¹⁰ : CommRing C
inst✝⁹ : Algebra A B
inst✝⁸ : Algebra A C
inst✝⁷ : Algebra R A
inst✝⁶ : Algebra R B
inst✝⁵ : IsScalarTower R A B
P : Ideal B
Q : Ideal C
p : Ideal A
inst✝⁴ : Q.LiesOver p
inst✝³ : P.LiesOver p
G : Type u_6
inst✝² : Group G
inst✝¹ : MulSemiringAction G B
inst✝ : SMulCommClass G A B
a₁✝ : A ⧸ p
a : A
a₂✝ : A ⧸ p
b : A
hab :
  (algebraMap (A ⧸ p) (B ⧸ P)) (Quot.mk (⇑(quotientRel p)) a) =
    (algebraMap (A ⧸ p) (B ⧸ P)) (Quot.mk (⇑(quotientRel p)) b)
⊢ (algebraMap A B) (a - b) ∈ P

Tactic:
rw [map_sub]

Goal state after:
R✝ : Type u_1
inst✝¹⁴ : CommRing R✝
R : Type u_2
inst✝¹³ : CommSemiring R
A : Type u_3
B : Type u_4
C : Type u_5
inst✝¹² : CommRing A
inst✝¹¹ : CommRing B
inst✝¹⁰ : CommRing C
inst✝⁹ : Algebra A B
inst✝⁸ : Algebra A C
inst✝⁷ : Algebra R A
inst✝⁶ : Algebra R B
inst✝⁵ : IsScalarTower R A B
P : Ideal B
Q : Ideal C
p : Ideal A
inst✝⁴ : Q.LiesOver p
inst✝³ : P.LiesOver p
G : Type u_6
inst✝² : Group G
inst✝¹ : MulSemiringAction G B
inst✝ : SMulCommClass G A B
a₁✝ : A ⧸ p
a : A
a₂✝ : A ⧸ p
b : A
hab :
  (algebraMap (A ⧸ p) (B ⧸ P)) (Quot.mk (⇑(quotientRel p)) a) =
    (algebraMap (A ⧸ p) (B ⧸ P)) (Quot.mk (⇑(quotientRel p)) b)
⊢ (algebraMap A B) a - (algebraMap A B) b ∈ P
Module: Mathlib.Algebra.Module.LocalizedModule.Submodule

Goal state before:
pp: R : Type u_1
S : Type u_2
M : Type u_3
N : Type u_4
inst✝¹⁰ : CommSemiring R
inst✝⁹ : CommSemiring S
inst✝⁸ : AddCommMonoid M
inst✝⁷ : AddCommMonoid N
inst✝⁶ : Module R M
inst✝⁵ : Module R N
inst✝⁴ : Algebra R S
inst✝³ : Module S N
inst✝² : IsScalarTower R S N
p : Submonoid R
inst✝¹ : IsLocalization p S
f : M →ₗ[R] N
inst✝ : IsLocalizedModule p f
M' M'' : Submodule R M
x y : N
x✝¹ : x ∈ {x | ∃ m ∈ M', ∃ s, IsLocalizedModule.mk' f m s = x}
x✝ : y ∈ {x | ∃ m ∈ M', ∃ s, IsLocalizedModule.mk' f m s = x}
m : M
hm : m ∈ M'
s : ↥p
hx : IsLocalizedModule.mk' f m s = x
n : M
hn : n ∈ M'
t : ↥p
hy : IsLocalizedModule.mk' f n t = y
⊢ IsLocalizedModule.mk' f (t • m + s • n) (s * t) = x + y

Tactic:
by rw [← hx, ← hy, IsLocalizedModule.mk'_add_mk']

Goal state after:
Module: Mathlib.Algebra.Module.LocalizedModule.Submodule

Goal state before:
pp: R : Type u_1
S : Type u_2
M : Type u_3
N : Type u_4
inst✝¹⁰ : CommSemiring R
inst✝⁹ : CommSemiring S
inst✝⁸ : AddCommMonoid M
inst✝⁷ : AddCommMonoid N
inst✝⁶ : Module R M
inst✝⁵ : Module R N
inst✝⁴ : Algebra R S
inst✝³ : Module S N
inst✝² : IsScalarTower R S N
p : Submonoid R
inst✝¹ : IsLocalization p S
f : M →ₗ[R] N
inst✝ : IsLocalizedModule p f
s : Set M
⊢ span S ↑(map f (span R s)) = span S (⇑f '' s)

Tactic:
map_span,

Goal state after:
R : Type u_1
S : Type u_2
M : Type u_3
N : Type u_4
inst✝¹⁰ : CommSemiring R
inst✝⁹ : CommSemiring S
inst✝⁸ : AddCommMonoid M
inst✝⁷ : AddCommMonoid N
inst✝⁶ : Module R M
inst✝⁵ : Module R N
inst✝⁴ : Algebra R S
inst✝³ : Module S N
inst✝² : IsScalarTower R S N
p : Submonoid R
inst✝¹ : IsLocalization p S
f : M →ₗ[R] N
inst✝ : IsLocalizedModule p f
s : Set M
⊢ span S ↑(span R (⇑f '' s)) = span S (⇑f '' s)
Module: Mathlib.RingTheory.Ideal.Quotient.Nilpotent

Goal state before:
pp: S : Type u_1
inst✝ : CommRing S
I : Ideal S
P : ⦃S : Type u_1⦄ → [inst : CommRing S] → Ideal S → Prop
h₁ : ∀ ⦃S : Type u_1⦄ [inst : CommRing S] (I : Ideal S), I ^ 2 = ⊥ → P I
h₂ : ∀ ⦃S : Type u_1⦄ [inst : CommRing S] (I J : Ideal S), I ≤ J → P I → P (map (Quotient.mk I) J) → P J
n : ℕ
hI : I ^ n = ⊥
⊢ P I

Tactic:
induction n using Nat.strong_induction_on generalizing S with

Goal state after:
case h
P : ⦃S : Type u_1⦄ → [inst : CommRing S] → Ideal S → Prop
h₁ : ∀ ⦃S : Type u_1⦄ [inst : CommRing S] (I : Ideal S), I ^ 2 = ⊥ → P I
h₂ : ∀ ⦃S : Type u_1⦄ [inst : CommRing S] (I J : Ideal S), I ≤ J → P I → P (map (Quotient.mk I) J) → P J
n : ℕ
H : ∀ m < n, ∀ {S : Type u_1} [inst : CommRing S] (I : Ideal S), I ^ m = ⊥ → P I
S : Type u_1
inst✝ : CommRing S
I : Ideal S
hI : I ^ n = ⊥
⊢ P I
Module: Mathlib.RingTheory.Localization.Algebra

Goal state before:
pp: R : Type u_1
S : Type u_2
P : Type u_3
Q : Type u_4
inst✝⁷ : CommSemiring R
inst✝⁶ : CommSemiring S
inst✝⁵ : CommSemiring P
inst✝⁴ : CommSemiring Q
M : Submonoid R
T : Submonoid P
inst✝³ : Algebra R S
inst✝² : Algebra P Q
inst✝¹ : IsLocalization M S
inst✝ : IsLocalization T Q
g : R →+* P
hT : Submonoid.map g M = T
x : R
s : ↥M
⊢ mk' S x s ∈ RingHom.ker (map Q g ⋯) ↔ mk' S x s ∈ Ideal.map (algebraMap R S) (RingHom.ker g)

Tactic:
simp [RingHom.mem_ker, IsLocalization.map_mk', IsLocalization.mk'_eq_zero_iff,
    IsLocalization.mk'_mem_map_algebraMap_iff, ← hT]

Goal state after:
Module: Mathlib.RingTheory.Localization.Algebra

Goal state before:
pp: R : Type u_5
inst✝²¹ : CommSemiring R
M : Submonoid R
A : Type u_6
inst✝²⁰ : CommSemiring A
inst✝¹⁹ : Algebra R A
B : Type u_7
inst✝¹⁸ : CommSemiring B
inst✝¹⁷ : Algebra R B
Rₚ : Type u_8
inst✝¹⁶ : CommSemiring Rₚ
inst✝¹⁵ : Algebra R Rₚ
inst✝¹⁴ : IsLocalization M Rₚ
Aₚ : Type u_9
inst✝¹³ : CommSemiring Aₚ
inst✝¹² : Algebra R Aₚ
inst✝¹¹ : Algebra A Aₚ
inst✝¹⁰ : IsScalarTower R A Aₚ
inst✝⁹ : IsLocalization (algebraMapSubmonoid A M) Aₚ
Bₚ : Type u_10
inst✝⁸ : CommSemiring Bₚ
inst✝⁷ : Algebra R Bₚ
inst✝⁶ : Algebra B Bₚ
inst✝⁵ : IsScalarTower R B Bₚ
inst✝⁴ : IsLocalization (algebraMapSubmonoid B M) Bₚ
inst✝³ : Algebra Rₚ Aₚ
inst✝² : Algebra Rₚ Bₚ
inst✝¹ : IsScalarTower R Rₚ Aₚ
inst✝ : IsScalarTower R Rₚ Bₚ
f : A →ₐ[R] B
⊢ (IsLocalizedModule.mapExtendScalars M (IsScalarTower.toAlgHom R A Aₚ).toLinearMap
        (IsScalarTower.toAlgHom R B Bₚ).toLinearMap Rₚ)
      f.toLinearMap =
    (mapₐ M Rₚ Aₚ Bₚ f).toLinearMap

Tactic:
refine LinearMap.restrictScalars_injective R ?_

Goal state after:
R : Type u_5
inst✝²¹ : CommSemiring R
M : Submonoid R
A : Type u_6
inst✝²⁰ : CommSemiring A
inst✝¹⁹ : Algebra R A
B : Type u_7
inst✝¹⁸ : CommSemiring B
inst✝¹⁷ : Algebra R B
Rₚ : Type u_8
inst✝¹⁶ : CommSemiring Rₚ
inst✝¹⁵ : Algebra R Rₚ
inst✝¹⁴ : IsLocalization M Rₚ
Aₚ : Type u_9
inst✝¹³ : CommSemiring Aₚ
inst✝¹² : Algebra R Aₚ
inst✝¹¹ : Algebra A Aₚ
inst✝¹⁰ : IsScalarTower R A Aₚ
inst✝⁹ : IsLocalization (algebraMapSubmonoid A M) Aₚ
Bₚ : Type u_10
inst✝⁸ : CommSemiring Bₚ
inst✝⁷ : Algebra R Bₚ
inst✝⁶ : Algebra B Bₚ
inst✝⁵ : IsScalarTower R B Bₚ
inst✝⁴ : IsLocalization (algebraMapSubmonoid B M) Bₚ
inst✝³ : Algebra Rₚ Aₚ
inst✝² : Algebra Rₚ Bₚ
inst✝¹ : IsScalarTower R Rₚ Aₚ
inst✝ : IsScalarTower R Rₚ Bₚ
f : A →ₐ[R] B
⊢ ↑R
      ((IsLocalizedModule.mapExtendScalars M (IsScalarTower.toAlgHom R A Aₚ).toLinearMap
          (IsScalarTower.toAlgHom R B Bₚ).toLinearMap Rₚ)
        f.toLinearMap) =
    ↑R (mapₐ M Rₚ Aₚ Bₚ f).toLinearMap
Module: Mathlib.LinearAlgebra.TensorProduct.Quotient

Goal state before:
pp: R : Type u_1
M : Type u_2
N : Type u_3
inst✝⁴ : CommRing R
inst✝³ : AddCommGroup M
inst✝² : Module R M
inst✝¹ : AddCommGroup N
inst✝ : Module R N
m : Submodule R M
n : Submodule R N
a : ↥m ⊗[R] N
b : M ⊗[R] ↥n
⊢ (map m.subtype LinearMap.id) a + (map LinearMap.id n.subtype) b ∈ (map m.mkQ n.mkQ).ker

Tactic:
simp only [LinearMap.mem_ker, map_add]

Goal state after:
R : Type u_1
M : Type u_2
N : Type u_3
inst✝⁴ : CommRing R
inst✝³ : AddCommGroup M
inst✝² : Module R M
inst✝¹ : AddCommGroup N
inst✝ : Module R N
m : Submodule R M
n : Submodule R N
a : ↥m ⊗[R] N
b : M ⊗[R] ↥n
⊢ (map m.mkQ n.mkQ) ((map m.subtype LinearMap.id) a) + (map m.mkQ n.mkQ) ((map LinearMap.id n.subtype) b) = 0
Module: Mathlib.LinearAlgebra.TensorProduct.Quotient

Goal state before:
pp: R : Type u_1
A : Type u_2
inst✝¹⁰ : CommRing R
inst✝⁹ : CommRing A
inst✝⁸ : Algebra R A
M : Type u_4
inst✝⁷ : AddCommGroup M
inst✝⁶ : Module R M
inst✝⁵ : Module A M
inst✝⁴ : IsScalarTower R A M
N : Type u_5
inst✝³ : AddCommGroup N
inst✝² : Module R N
inst✝¹ : Module A N
inst✝ : IsScalarTower R A N
⊢ (mapOfCompatibleSMul A R A M N).ker = Submodule.span A {x | ∃ a m n, (a • m) ⊗ₜ[R] n - m ⊗ₜ[R] (a • n) = x}

Tactic:
refine (Submodule.span_eq_of_le (mapOfCompatibleSMul A R A M N).ker ?_ ?_).symm
  · rintro - ⟨a, m, n, rfl⟩
    simp [smul_tmul]
  · let S := Submodule.span A {(a • m) ⊗ₜ[R] n - m ⊗ₜ[R] (a • n) | (a : A) (m : M) (n : N)}
    let F : M ⊗[A] N →ₗ[A] (M ⊗[R] N) ⧸ S := TensorProduct.lift ({
      toFun m := {
        toFun n := S.mkQ (m ⊗ₜ[R] n)
        map_add' _ _ := by simp [tmul_add]
        map_smul' a n := by
          rw [Submodule.mkQ_apply, Submodule.mkQ_apply, ← Submodule.Quotient.mk_smul, eq_comm,
            Submodule.Quotient.eq, RingHom.id_apply]
          exact Submodule.subset_span ⟨a, m, n, rfl⟩ }
      map_add' _ _ := by ext _; simp [add_tmul]
      map_smul' _ _ := by simp; rfl })
    have h : F ∘ₗ mapOfCompatibleSMul A R A M N = S.mkQ := by ext; simp [S, F]
    change (mapOfCompatibleSMul A R A M N).ker ≤ S
    rw [← Submodule.ker_mkQ S, ← h]
    exact (mapOfCompatibleSMul A R A M N).ker_le_ker_comp F

Goal state after:
Module: Mathlib.RingTheory.LocalProperties.Basic

Goal state before:
pp: R S : Type u
inst✝⁷ : CommRing R
inst✝⁶ : CommRing S
P : {R S : Type u} → [inst : CommRing R] → [inst_1 : CommRing S] → (R →+* S) → Prop
hPc : StableUnderComposition fun {R S} [CommRing R] [CommRing S] ↦ P
hPp : LocalizationPreserves fun {R S} [CommRing R] [CommRing S] ↦ P
hPl : HoldsForLocalization fun {R S} [CommRing R] [CommRing S] ↦ P
M : Submonoid R
T : Submonoid S
R' : Type u
inst✝⁵ : CommRing R'
inst✝⁴ : Algebra R R'
inst✝³ : IsLocalization M R'
S' : Type u
inst✝² : CommRing S'
inst✝¹ : Algebra S S'
inst✝ : IsLocalization T S'
f : R →+* S
hy : M ≤ Submonoid.comap f T
hf : P f
hle : Submonoid.map f M ≤ T
this✝¹ : Algebra (Localization (Submonoid.map f M)) S' :=
  IsLocalization.localizationAlgebraOfSubmonoidLe (Localization (Submonoid.map f M)) S' (Submonoid.map f M) T hle
this✝ : IsScalarTower S (Localization (Submonoid.map f M)) S'
this : IsLocalization (Submonoid.map (algebraMap S (Localization (Submonoid.map f M))) T) S'
heq :
  IsLocalization.map S' f hy =
    (algebraMap (Localization (Submonoid.map f M)) S').comp (IsLocalization.map (Localization (Submonoid.map f M)) f ⋯)
⊢ P
    ((algebraMap (Localization (Submonoid.map f M)) S').comp
      (IsLocalization.map (Localization (Submonoid.map f M)) f ⋯))

Tactic:
exact hPc _ _ (hPp _ _ _ _ hf) (hPl _ (T.map (algebraMap S (Localization (M.map f)))))

Goal state after:
Module: Mathlib.RingTheory.LocalProperties.Basic

Goal state before:
pp: R S : Type u
inst✝¹ : CommRing R
inst✝ : CommRing S
f : R →+* S
P : {R S : Type u} → [inst : CommRing R] → [inst_1 : CommRing S] → (R →+* S) → Prop
H : HoldsForLocalizationAway fun {R S} [CommRing R] [CommRing S] ↦ P
hf : Function.Bijective ⇑f
this✝¹ : Algebra R S := f.toAlgebra
this✝ : IsLocalization (Submonoid.powers 1) R
this : IsLocalization (Submonoid.powers 1) S
⊢ P f

Tactic:
exact H _ 1

Goal state after:
Module: Mathlib.RingTheory.LocalProperties.Basic

Goal state before:
pp: P : {R S : Type u} → [inst : CommRing R] → [inst_1 : CommRing S] → (R →+* S) → Prop
hP : LocalizationAwayPreserves fun {R S} [CommRing R] [CommRing S] ↦ P
R S T : Type u
x✝² : CommRing R
x✝¹ : CommRing S
x✝ : CommRing T
f : R →+* S
e : S ≃+* T
hf : P f
⊢ (fun {R S} [CommRing R] [CommRing S] ↦ P) (e.toRingHom.comp f)

Tactic:
let := e.toRingHom.toAlgebra

Goal state after:
P : {R S : Type u} → [inst : CommRing R] → [inst_1 : CommRing S] → (R →+* S) → Prop
hP : LocalizationAwayPreserves fun {R S} [CommRing R] [CommRing S] ↦ P
R S T : Type u
x✝² : CommRing R
x✝¹ : CommRing S
x✝ : CommRing T
f : R →+* S
e : S ≃+* T
hf : P f
this : Algebra S T := e.toRingHom.toAlgebra
⊢ (fun {R S} [CommRing R] [CommRing S] ↦ P) (e.toRingHom.comp f)
Module: Mathlib.RingTheory.LocalProperties.Basic

Goal state before:
pp: P : {R S : Type u} → [inst : CommRing R] → [inst_1 : CommRing S] → (R →+* S) → Prop
hP : StableUnderCompositionWithLocalizationAway fun {R S} [CommRing R] [CommRing S] ↦ P
R S T : Type u
x✝² : CommRing R
x✝¹ : CommRing S
x✝ : CommRing T
f : R →+* S
e : S ≃+* T
hf : P f
⊢ (fun {R S} [CommRing R] [CommRing S] ↦ P) (e.toRingHom.comp f)

Tactic:
let := e.toRingHom.toAlgebra

Goal state after:
P : {R S : Type u} → [inst : CommRing R] → [inst_1 : CommRing S] → (R →+* S) → Prop
hP : StableUnderCompositionWithLocalizationAway fun {R S} [CommRing R] [CommRing S] ↦ P
R S T : Type u
x✝² : CommRing R
x✝¹ : CommRing S
x✝ : CommRing T
f : R →+* S
e : S ≃+* T
hf : P f
this : Algebra S T := e.toRingHom.toAlgebra
⊢ (fun {R S} [CommRing R] [CommRing S] ↦ P) (e.toRingHom.comp f)
Module: Mathlib.RingTheory.LocalProperties.Basic

Goal state before:
pp: P : {R S : Type u} → [inst : CommRing R] → [inst_1 : CommRing S] → (R →+* S) → Prop
hP : StableUnderCompositionWithLocalizationAway fun {R S} [CommRing R] [CommRing S] ↦ P
R S T : Type u
x✝² : CommRing R
x✝¹ : CommRing S
x✝ : CommRing T
f : S →+* T
e : R ≃+* S
hf : P f
⊢ (fun {R S} [CommRing R] [CommRing S] ↦ P) (f.comp e.toRingHom)

Tactic:
let := e.toRingHom.toAlgebra

Goal state after:
P : {R S : Type u} → [inst : CommRing R] → [inst_1 : CommRing S] → (R →+* S) → Prop
hP : StableUnderCompositionWithLocalizationAway fun {R S} [CommRing R] [CommRing S] ↦ P
R S T : Type u
x✝² : CommRing R
x✝¹ : CommRing S
x✝ : CommRing T
f : S →+* T
e : R ≃+* S
hf : P f
this : Algebra R S := e.toRingHom.toAlgebra
⊢ (fun {R S} [CommRing R] [CommRing S] ↦ P) (f.comp e.toRingHom)
Module: Mathlib.LinearAlgebra.Dimension.Localization

Goal state before:
pp: R : Type uR
S : Type uS
inst✝⁹ : CommRing R
inst✝⁸ : CommRing S
inst✝⁷ : Algebra R S
A : Type u_1
inst✝⁶ : CommRing A
inst✝⁵ : Algebra S A
inst✝⁴ : Algebra R A
inst✝³ : IsScalarTower R S A
M : Submonoid S
inst✝² : IsLocalization M A
inst✝¹ : FaithfulSMul S A
s : Finset A
hs : ∀ (f : A → R), ∑ i ∈ s, f i • id i = 0 → ∀ i ∈ s, f i = 0
inst✝ : DecidableEq S
f : A → R
h : ∑ i ∈ commonDenomOfFinset M s • s, f i • id i = 0
⊢ ∀ i ∈ Finset.image (fun x ↦ commonDenomOfFinset M s • x) s, f i = 0

Tactic:
s.forall_mem_image

Goal state after:
R : Type uR
S : Type uS
inst✝⁹ : CommRing R
inst✝⁸ : CommRing S
inst✝⁷ : Algebra R S
A : Type u_1
inst✝⁶ : CommRing A
inst✝⁵ : Algebra S A
inst✝⁴ : Algebra R A
inst✝³ : IsScalarTower R S A
M : Submonoid S
inst✝² : IsLocalization M A
inst✝¹ : FaithfulSMul S A
s : Finset A
hs : ∀ (f : A → R), ∑ i ∈ s, f i • id i = 0 → ∀ i ∈ s, f i = 0
inst✝ : DecidableEq S
f : A → R
h : ∑ i ∈ commonDenomOfFinset M s • s, f i • id i = 0
⊢ ∀ ⦃x : A⦄, x ∈ s → f (commonDenomOfFinset M s • x) = 0
Module: Mathlib.LinearAlgebra.Dimension.Localization

Goal state before:
pp: R : Type uR
M : Type uM
inst✝³ : CommRing R
inst✝² : AddCommGroup M
inst✝¹ : Module R M
inst✝ : IsDomain R
w : Free.ChooseBasisIndex (FractionRing R) (LocalizedModule R⁰ M) → M
hw : LinearIndependent R w
⊢ lift.{max uR uM, uM} #↑(Set.range w) = lift.{max uR uM, uM} (Module.rank R M)

Tactic:
Cardinal.mk_range_eq_of_injective hw.injective,

Goal state after:
R : Type uR
M : Type uM
inst✝³ : CommRing R
inst✝² : AddCommGroup M
inst✝¹ : Module R M
inst✝ : IsDomain R
w : Free.ChooseBasisIndex (FractionRing R) (LocalizedModule R⁰ M) → M
hw : LinearIndependent R w
⊢ lift.{uM, max uM uR} #(Free.ChooseBasisIndex (FractionRing R) (LocalizedModule R⁰ M)) =
    lift.{max uR uM, uM} (Module.rank R M)
Module: Mathlib.LinearAlgebra.Matrix.Transvection

Goal state before:
pp: n : Type u_1
R : Type u₂
inst✝² : DecidableEq n
inst✝¹ : CommRing R
inst✝ : Fintype n
t : TransvectionStruct n R
⊢ t.inv.toMatrix * t.toMatrix = 1

Tactic:
by
  rcases t with ⟨_, _, t_hij⟩
  simp [toMatrix, transvection_mul_transvection_same, t_hij]

Goal state after:
Module: Mathlib.LinearAlgebra.Matrix.Transvection

Goal state before:
pp: n : Type u_1
R : Type u₂
inst✝² : DecidableEq n
inst✝¹ : CommRing R
inst✝ : Fintype n
t : TransvectionStruct n R
⊢ t.toMatrix * t.inv.toMatrix = 1

Tactic:
by
  rcases t with ⟨_, _, t_hij⟩
  simp [toMatrix, transvection_mul_transvection_same, t_hij]

Goal state after:
Module: Mathlib.LinearAlgebra.Matrix.Adjugate

Goal state before:
pp: n : Type v
α : Type w
inst✝² : DecidableEq n
inst✝¹ : Fintype n
inst✝ : CommRing α
A : Matrix n n α
h_card : Fintype.card n - Nat.succ 0 + Nat.succ 0 = Fintype.card n
A' : Matrix n n (MvPolynomial (n × n) ℤ) := mvPolynomialX n n ℤ
this : A'.adjugate.det = A'.det ^ (Fintype.card n - 1)
⊢ ((MvPolynomial.aeval fun p ↦ A p.1 p.2).mapMatrix (mvPolynomialX n n ℤ).adjugate).det =
    ((MvPolynomial.aeval fun p ↦ A p.1 p.2).mapMatrix (mvPolynomialX n n ℤ)).det ^ (Fintype.card n - 1)

Tactic:
← AlgHom.map_det,

Goal state after:
n : Type v
α : Type w
inst✝² : DecidableEq n
inst✝¹ : Fintype n
inst✝ : CommRing α
A : Matrix n n α
h_card : Fintype.card n - Nat.succ 0 + Nat.succ 0 = Fintype.card n
A' : Matrix n n (MvPolynomial (n × n) ℤ) := mvPolynomialX n n ℤ
this : A'.adjugate.det = A'.det ^ (Fintype.card n - 1)
⊢ (MvPolynomial.aeval fun p ↦ A p.1 p.2) (mvPolynomialX n n ℤ).adjugate.det =
    ((MvPolynomial.aeval fun p ↦ A p.1 p.2).mapMatrix (mvPolynomialX n n ℤ)).det ^ (Fintype.card n - 1)
Module: Mathlib.LinearAlgebra.Matrix.Adjugate

Goal state before:
pp: n : Type v
α : Type w
inst✝² : DecidableEq n
inst✝¹ : Fintype n
inst✝ : CommRing α
A : Matrix n n α
h_card : Fintype.card n - Nat.succ 0 + Nat.succ 0 = Fintype.card n
A' : Matrix n n (MvPolynomial (n × n) ℤ) := mvPolynomialX n n ℤ
⊢ (A' * A'.adjugate).det = A'.det ^ Fintype.card n

Tactic:
by rw [mul_adjugate A', det_smul, det_one, mul_one]

Goal state after:
Module: Mathlib.LinearAlgebra.Matrix.Adjugate

Goal state before:
pp: n : Type v
α : Type w
inst✝² : DecidableEq n
inst✝¹ : Fintype n
inst✝ : CommRing α
A B : Matrix n n α
g : Matrix n n α → Matrix n n α[X] := fun M ↦ M.map ⇑C + X • 1
f' : Matrix n n α[X] →+* Matrix n n α := (evalRingHom 0).mapMatrix
f'_inv : ∀ (M : Matrix n n α), f' (g M) = M
f'_adj : ∀ (M : Matrix n n α), f' (g M).adjugate = M.adjugate
M : Matrix n n α
⊢ ∀ (N : Matrix n n α), f' (g M * g N) = M * N

Tactic:
N

Goal state after:
n : Type v
α : Type w
inst✝² : DecidableEq n
inst✝¹ : Fintype n
inst✝ : CommRing α
A B : Matrix n n α
g : Matrix n n α → Matrix n n α[X] := fun M ↦ M.map ⇑C + X • 1
f' : Matrix n n α[X] →+* Matrix n n α := (evalRingHom 0).mapMatrix
f'_inv : ∀ (M : Matrix n n α), f' (g M) = M
f'_adj : ∀ (M : Matrix n n α), f' (g M).adjugate = M.adjugate
M N : Matrix n n α
⊢ f' (g M * g N) = M * N
Module: Mathlib.LinearAlgebra.Matrix.Adjugate

Goal state before:
pp: n : Type v
α : Type w
inst✝² : DecidableEq n
inst✝¹ : Fintype n
inst✝ : CommRing α
A : Matrix n n α
h : Fintype.card n ≠ 1
n✝ : ℕ
h_card : Fintype.card n = n✝ + 1 + 1
A' : Matrix n n (MvPolynomial (n × n) ℤ) := mvPolynomialX n n ℤ
this : A'.adjugate.adjugate = A'.det ^ (Fintype.card n - 2) • A'
⊢ (MvPolynomial.aeval fun p ↦ A p.1 p.2).mapMatrix (A'.det ^ (Fintype.card n - 2) • A') =
    ((MvPolynomial.aeval fun p ↦ A p.1 p.2).mapMatrix (mvPolynomialX n n ℤ)).det ^ (Fintype.card n - 2) •
      (MvPolynomial.aeval fun p ↦ A p.1 p.2).mapMatrix (mvPolynomialX n n ℤ)

Tactic:
← AlgHom.map_det,

Goal state after:
n : Type v
α : Type w
inst✝² : DecidableEq n
inst✝¹ : Fintype n
inst✝ : CommRing α
A : Matrix n n α
h : Fintype.card n ≠ 1
n✝ : ℕ
h_card : Fintype.card n = n✝ + 1 + 1
A' : Matrix n n (MvPolynomial (n × n) ℤ) := mvPolynomialX n n ℤ
this : A'.adjugate.adjugate = A'.det ^ (Fintype.card n - 2) • A'
⊢ (MvPolynomial.aeval fun p ↦ A p.1 p.2).mapMatrix (A'.det ^ (Fintype.card n - 2) • A') =
    (MvPolynomial.aeval fun p ↦ A p.1 p.2) (mvPolynomialX n n ℤ).det ^ (Fintype.card n - 2) •
      (MvPolynomial.aeval fun p ↦ A p.1 p.2).mapMatrix (mvPolynomialX n n ℤ)
Module: Mathlib.LinearAlgebra.Matrix.NonsingularInverse

Goal state before:
pp: case inr.inr
n : Type u'
α : Type v
inst✝² : Fintype n
inst✝¹ : DecidableEq n
inst✝ : CommRing α
ht : Nontrivial α
hc : 0 < Fintype.card n
⊢ 0⁻¹ = 0

Tactic:
have hn : Nonempty n := Fintype.card_pos_iff.mp hc

Goal state after:
case inr.inr
n : Type u'
α : Type v
inst✝² : Fintype n
inst✝¹ : DecidableEq n
inst✝ : CommRing α
ht : Nontrivial α
hc : 0 < Fintype.card n
hn : Nonempty n
⊢ 0⁻¹ = 0
Module: Mathlib.LinearAlgebra.Matrix.NonsingularInverse

Goal state before:
pp: n : Type u'
α : Type v
inst✝² : Fintype n
inst✝¹ : DecidableEq n
inst✝ : CommRing α
⊢ [].prod⁻¹ = (List.map Inv.inv [].reverse).prod

Tactic:
List.reverse_nil,

Goal state after:
n : Type u'
α : Type v
inst✝² : Fintype n
inst✝¹ : DecidableEq n
inst✝ : CommRing α
⊢ [].prod⁻¹ = (List.map Inv.inv []).prod
Module: Mathlib.RingTheory.MatrixAlgebra

Goal state before:
pp: n : Type u_3
R : Type u_5
A : Type u_7
inst✝⁴ : CommSemiring R
inst✝³ : Semiring A
inst✝² : Algebra R A
inst✝¹ : DecidableEq n
inst✝ : Fintype n
M : Matrix n n R
⊢ invFun n R A (M.map ⇑(algebraMap R A)) = 1 ⊗ₜ[R] M

Tactic:
dsimp [invFun]

Goal state after:
n : Type u_3
R : Type u_5
A : Type u_7
inst✝⁴ : CommSemiring R
inst✝³ : Semiring A
inst✝² : Algebra R A
inst✝¹ : DecidableEq n
inst✝ : Fintype n
M : Matrix n n R
⊢ ∑ p, (algebraMap R A) (M p.1 p.2) ⊗ₜ[R] single p.1 p.2 1 = 1 ⊗ₜ[R] M
Module: Mathlib.LinearAlgebra.Matrix.SchurComplement

Goal state before:
pp: m : Type u_2
α : Type u_4
inst✝³ : Fintype m
inst✝² : DecidableEq m
inst✝¹ : CommRing α
ι : Type u_5
inst✝ : Unique ι
u v : m → α
⊢ (1 + replicateRow ι v * replicateCol ι u).det = 1 + v ⬝ᵥ u

Tactic:
det_unique,

Goal state after:
m : Type u_2
α : Type u_4
inst✝³ : Fintype m
inst✝² : DecidableEq m
inst✝¹ : CommRing α
ι : Type u_5
inst✝ : Unique ι
u v : m → α
⊢ (1 + replicateRow ι v * replicateCol ι u) default default = 1 + v ⬝ᵥ u
Module: Mathlib.Algebra.Polynomial.Identities

Goal state before:
pp: R : Type u
inst✝ : CommRing R
f : R[X]
x y : R
⊢ eval₂ (RingHom.id R) (x + y) f = f.sum fun e a ↦ a * (x ^ e + ↑e * x ^ (e - 1) * y + ↑(polyBinomAux1 x y e a) * y ^ 2)

Tactic:
rw [eval₂_eq_sum]

Goal state after:
R : Type u
inst✝ : CommRing R
f : R[X]
x y : R
⊢ (f.sum fun e a ↦ (RingHom.id R) a * (x + y) ^ e) =
    f.sum fun e a ↦ a * (x ^ e + ↑e * x ^ (e - 1) * y + ↑(polyBinomAux1 x y e a) * y ^ 2)