mathlib-initiative/mathlib-tactics huggingface dataset:
Module: Mathlib.LinearAlgebra.Matrix.Basis

Goal state before:
pp: case intro
ι : Type u_1
ι' : Type u_2
κ : Type u_3
κ' : Type u_4
R : Type u_5
M : Type u_6
inst✝¹⁰ : CommSemiring R
inst✝⁹ : AddCommMonoid M
inst✝⁸ : Module R M
N : Type u_9
inst✝⁷ : AddCommMonoid N
inst✝⁶ : Module R N
b : Basis ι R M
b' : Basis ι' R M
c : Basis κ R N
c' : Basis κ' R N
f : M →ₗ[R] N
inst✝⁵ : Fintype ι'
inst✝⁴ : Finite κ
inst✝³ : Fintype ι
inst✝² : Fintype κ'
inst✝¹ : DecidableEq ι
inst✝ : DecidableEq ι'
val✝ : Fintype κ
⊢ (toMatrix b' c) f * b'.toMatrix ⇑b = (toMatrix b c) f

Tactic:
linearMap_toMatrix_mul_basis_toMatrix

Goal state after:
case intro
ι : Type u_1
ι' : Type u_2
κ : Type u_3
κ' : Type u_4
R : Type u_5
M : Type u_6
inst✝¹⁰ : CommSemiring R
inst✝⁹ : AddCommMonoid M
inst✝⁸ : Module R M
N : Type u_9
inst✝⁷ : AddCommMonoid N
inst✝⁶ : Module R N
b : Basis ι R M
b' : Basis ι' R M
c : Basis κ R N
c' : Basis κ' R N
f : M →ₗ[R] N
inst✝⁵ : Fintype ι'
inst✝⁴ : Finite κ
inst✝³ : Fintype ι
inst✝² : Fintype κ'
inst✝¹ : DecidableEq ι
inst✝ : DecidableEq ι'
val✝ : Fintype κ
⊢ (toMatrix b c) f = (toMatrix b c) f
Module: Mathlib.RingTheory.RootsOfUnity.Basic

Goal state before:
pp: R : Type u_4
k : ℕ
inst✝¹ : CommMonoid R
inst✝ : NeZero k
x : R
x✝ : x ∈ val '' ↑(rootsOfUnity k R)
y : Rˣ
hy1 : y ∈ ↑(rootsOfUnity k R)
hy2 : ↑y = x
⊢ x ∈ {z | z ^ k = 1}

Tactic:
rw [← hy2]; exact (mem_rootsOfUnity' k y).mp hy1

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

Goal state before:
pp: case mpr.refine_2.calc_1
n : Type u_1
inst✝⁶ : Fintype n
A : Type u_4
K : Type u_5
inst✝⁵ : DecidableEq n
inst✝⁴ : CommRing A
inst✝³ : Nontrivial A
inst✝² : Field K
inst✝¹ : Algebra A K
inst✝ : IsFractionRing A K
M : Matrix n n A
this✝ : (∃ v, v ≠ 0 ∧ (algebraMap A K).mapMatrix M *ᵥ v = 0) ↔ M.det = 0
v : n → K
hv : v ≠ 0
mul_eq : (algebraMap A K).mapMatrix M *ᵥ v = 0
this : DecidableEq K := Classical.decEq K
b : A
hb : b ∈ nonZeroDivisors A
f : (a : K) → a ∈ Finset.image v Finset.univ → A
hf : ∀ (a : K) (a_1 : a ∈ Finset.image v Finset.univ), (algebraMap A K) (f a a_1) = ↑⟨b, hb⟩ • a
i : n
⊢ (algebraMap A K) ((M *ᵥ fun i ↦ f (v i) ⋯) i) = ((algebraMap A K).mapMatrix M *ᵥ (algebraMap A K) b • v) i

Tactic:
RingHom.map_mulVec,

Goal state after:
case mpr.refine_2.calc_1
n : Type u_1
inst✝⁶ : Fintype n
A : Type u_4
K : Type u_5
inst✝⁵ : DecidableEq n
inst✝⁴ : CommRing A
inst✝³ : Nontrivial A
inst✝² : Field K
inst✝¹ : Algebra A K
inst✝ : IsFractionRing A K
M : Matrix n n A
this✝ : (∃ v, v ≠ 0 ∧ (algebraMap A K).mapMatrix M *ᵥ v = 0) ↔ M.det = 0
v : n → K
hv : v ≠ 0
mul_eq : (algebraMap A K).mapMatrix M *ᵥ v = 0
this : DecidableEq K := Classical.decEq K
b : A
hb : b ∈ nonZeroDivisors A
f : (a : K) → a ∈ Finset.image v Finset.univ → A
hf : ∀ (a : K) (a_1 : a ∈ Finset.image v Finset.univ), (algebraMap A K) (f a a_1) = ↑⟨b, hb⟩ • a
i : n
⊢ (M.map ⇑(algebraMap A K) *ᵥ ⇑(algebraMap A K) ∘ fun i ↦ f (v i) ⋯) i =
    ((algebraMap A K).mapMatrix M *ᵥ (algebraMap A K) b • v) i
Module: Mathlib.LinearAlgebra.Matrix.ToLinearEquiv

Goal state before:
pp: n : Type u_1
A : Type u_4
inst✝² : CommRing A
inst✝¹ : IsDomain A
M : Matrix n n A
inst✝ : Finite n
t : A
h : t ≠ 0
this : (α : Type ?u.44) → [Finite α] → Fintype α
⊢ (t • M).Nondegenerate ↔ M.Nondegenerate

Tactic:
nondegenerate_def,

Goal state after:
n : Type u_1
A : Type u_4
inst✝² : CommRing A
inst✝¹ : IsDomain A
M : Matrix n n A
inst✝ : Finite n
t : A
h : t ≠ 0
this : (α : Type u_1) → [Finite α] → Fintype α
⊢ ((∀ (v : n → A), (∀ (w : n → A), v ⬝ᵥ (t • M) *ᵥ w = 0) → v = 0) ∧
      ∀ (w : n → A), (∀ (v : n → A), v ⬝ᵥ (t • M) *ᵥ w = 0) → w = 0) ↔
    M.Nondegenerate
Module: Mathlib.LinearAlgebra.Matrix.SpecialLinearGroup

Goal state before:
pp: case neg
n : Type u
inst✝² : DecidableEq n
inst✝¹ : Fintype n
R : Type v
inst✝ : CommRing R
A : ↥(center (SpecialLinearGroup n R))
h : ¬IsEmpty n
pf✝ : Nonempty n
⊢ ↑↑A = (scalar n) (↑↑A (Classical.arbitrary n) (Classical.arbitrary n))

Tactic:
scalar_eq_coe_self_center

Goal state after:
case neg
n : Type u
inst✝² : DecidableEq n
inst✝¹ : Fintype n
R : Type v
inst✝ : CommRing R
A : ↥(center (SpecialLinearGroup n R))
h : ¬IsEmpty n
pf✝ : Nonempty n
⊢ ↑↑A = ↑↑A
Module: Mathlib.LinearAlgebra.QuadraticForm.Basic

Goal state before:
pp: S : Type u_1
T : Type u_2
R : Type u_3
M : Type u_4
N : Type u_5
P : Type u_6
A : Type u_7
inst✝⁴ : CommSemiring R
inst✝³ : AddCommMonoid M
inst✝² : Module R M
inst✝¹ : AddCommMonoid N
inst✝ : Module R N
a : R
x✝ : M
⊢ 0 = (a * a) • 0

Tactic:
simp only [smul_zero]

Goal state after:
Module: Mathlib.Algebra.DirectSum.Internal

Goal state before:
pp: ι : Type u_1
σ : Type u_2
R : Type u_4
inst✝⁶ : DecidableEq ι
inst✝⁵ : Semiring R
inst✝⁴ : SetLike σ R
inst✝³ : AddSubmonoidClass σ R
A : ι → σ
inst✝² : AddMonoid ι
inst✝¹ : SetLike.GradedMonoid A
inst✝ : (i : ι) → (x : ↥(A i)) → Decidable (x ≠ 0)
r r' : ⨁ (i : ι), ↥(A i)
n : ι
⊢ ↑(DFinsupp.sum r fun i₁ b ↦
        (DFinsupp.sum r' fun x aj ↦ (of (fun i ↦ ↥(A i)) (i₁ + x)) (GradedMonoid.GMul.mul b aj)) n) =
    DFinsupp.sum r fun i ri ↦ DFinsupp.sum r' fun j rj ↦ if i + j = n then ↑ri * ↑rj else 0

Tactic:
DFinsupp.sum,

Goal state after:
ι : Type u_1
σ : Type u_2
R : Type u_4
inst✝⁶ : DecidableEq ι
inst✝⁵ : Semiring R
inst✝⁴ : SetLike σ R
inst✝³ : AddSubmonoidClass σ R
A : ι → σ
inst✝² : AddMonoid ι
inst✝¹ : SetLike.GradedMonoid A
inst✝ : (i : ι) → (x : ↥(A i)) → Decidable (x ≠ 0)
r r' : ⨁ (i : ι), ↥(A i)
n : ι
⊢ ↑(∑ i ∈ DFinsupp.support r,
        (DFinsupp.sum r' fun x aj ↦ (of (fun i ↦ ↥(A i)) (i + x)) (GradedMonoid.GMul.mul (r i) aj)) n) =
    DFinsupp.sum r fun i ri ↦ DFinsupp.sum r' fun j rj ↦ if i + j = n then ↑ri * ↑rj else 0
Module: Mathlib.Algebra.DirectSum.Internal

Goal state before:
pp: case e_f
ι : Type u_1
σ : Type u_2
R : Type u_4
inst✝⁶ : DecidableEq ι
inst✝⁵ : Semiring R
inst✝⁴ : SetLike σ R
inst✝³ : AddSubmonoidClass σ R
A : ι → σ
inst✝² : AddMonoid ι
inst✝¹ : SetLike.GradedMonoid A
inst✝ : (i : ι) → (x : ↥(A i)) → Decidable (x ≠ 0)
r r' : ⨁ (i : ι), ↥(A i)
n x✝ : ι
⊢ ↑(DFinsupp.sum r' fun i₁ b ↦ ((of (fun i ↦ ↥(A i)) (x✝ + i₁)) (GradedMonoid.GMul.mul (r x✝) b)) n) =
    (fun i ri ↦ DFinsupp.sum r' fun j rj ↦ if i + j = n then ↑ri * ↑rj else 0) x✝ (r x✝)

Tactic:
DFinsupp.sum,

Goal state after:
case e_f
ι : Type u_1
σ : Type u_2
R : Type u_4
inst✝⁶ : DecidableEq ι
inst✝⁵ : Semiring R
inst✝⁴ : SetLike σ R
inst✝³ : AddSubmonoidClass σ R
A : ι → σ
inst✝² : AddMonoid ι
inst✝¹ : SetLike.GradedMonoid A
inst✝ : (i : ι) → (x : ↥(A i)) → Decidable (x ≠ 0)
r r' : ⨁ (i : ι), ↥(A i)
n x✝ : ι
⊢ ↑(∑ i ∈ DFinsupp.support r', ((of (fun i ↦ ↥(A i)) (x✝ + i)) (GradedMonoid.GMul.mul (r x✝) (r' i))) n) =
    (fun i ri ↦ DFinsupp.sum r' fun j rj ↦ if i + j = n then ↑ri * ↑rj else 0) x✝ (r x✝)
Module: Mathlib.LinearAlgebra.Matrix.SesquilinearForm

Goal state before:
pp: case e'_1.e'_3
R : Type u_1
n : Type u_11
inst✝² : CommRing R
inst✝¹ : Fintype n
J A₁ A₂ : Matrix n n R
inst✝ : DecidableEq n
P : Matrix n n R
h : IsUnit P
h' : IsUnit P.det
u : (Matrix n n R)ˣ := P.nonsingInvUnit h'
v : (Matrix n n R)ˣ := Pᵀ.nonsingInvUnit ⋯
x : Matrix n n R := A₁ᵀ * Pᵀ * J
y : Matrix n n R := J * P * A₂
this : x * ↑u = ↑v * y ↔ ↑v⁻¹ * x = y * ↑u⁻¹
⊢ Pᵀ * (J * (P * A₂)) = ↑v * y

Tactic:
← mul_assoc J

Goal state after:
case e'_1.e'_3
R : Type u_1
n : Type u_11
inst✝² : CommRing R
inst✝¹ : Fintype n
J A₁ A₂ : Matrix n n R
inst✝ : DecidableEq n
P : Matrix n n R
h : IsUnit P
h' : IsUnit P.det
u : (Matrix n n R)ˣ := P.nonsingInvUnit h'
v : (Matrix n n R)ˣ := Pᵀ.nonsingInvUnit ⋯
x : Matrix n n R := A₁ᵀ * Pᵀ * J
y : Matrix n n R := J * P * A₂
this : x * ↑u = ↑v * y ↔ ↑v⁻¹ * x = y * ↑u⁻¹
⊢ Pᵀ * (J * P * A₂) = ↑v * y
Module: Mathlib.LinearAlgebra.QuadraticForm.Basic

Goal state before:
pp: S : Type u_1
R : Type u_3
M : Type u_4
N : Type u_5
inst✝⁹ : CommRing R
inst✝⁸ : AddCommGroup M
inst✝⁷ : Module R M
inst✝⁶ : AddCommGroup N
inst✝⁵ : Module R N
inst✝⁴ : CommSemiring S
inst✝³ : Algebra S R
inst✝² : Module S N
inst✝¹ : IsScalarTower S R N
inst✝ : Invertible 2
Q : QuadraticMap R M N
x : M
⊢ (((associatedHom S) Q) x) x = Q x

Tactic:
by
  rw [associated_apply, map_add_self, ← three_add_one_eq_four, ← two_add_one_eq_three, add_smul,
    add_smul, one_smul, add_sub_cancel_right, add_sub_cancel_right, two_smul, ← two_smul R,
    invOf_smul_eq_iff, two_smul, two_smul]

Goal state after:
Module: Mathlib.Algebra.DirectSum.Internal

Goal state before:
pp: ι : Type u_1
σ : Type u_2
R : Type u_4
inst✝⁵ : DecidableEq ι
inst✝⁴ : Semiring R
inst✝³ : SetLike σ R
inst✝² : AddSubmonoidClass σ R
A : ι → σ
inst✝¹ : AddMonoid ι
inst✝ : SetLike.GradedMonoid A
i : ι
r : ↥(A i)
r' : ⨁ (i : ι), ↥(A i)
j n : ι
H : ∀ (x : ι), i + x = n ↔ x = j
⊢ (DFinsupp.sum r' fun j rj ↦ if i + j = n then ↑r * ↑rj else 0) = ↑r * ↑(r' j)

Tactic:
DFinsupp.sum,

Goal state after:
ι : Type u_1
σ : Type u_2
R : Type u_4
inst✝⁵ : DecidableEq ι
inst✝⁴ : Semiring R
inst✝³ : SetLike σ R
inst✝² : AddSubmonoidClass σ R
A : ι → σ
inst✝¹ : AddMonoid ι
inst✝ : SetLike.GradedMonoid A
i : ι
r : ↥(A i)
r' : ⨁ (i : ι), ↥(A i)
j n : ι
H : ∀ (x : ι), i + x = n ↔ x = j
⊢ (∑ x ∈ DFinsupp.support r', if i + x = n then ↑r * ↑(r' x) else 0) = ↑r * ↑(r' j)
Module: Mathlib.LinearAlgebra.Matrix.SesquilinearForm

Goal state before:
pp: R : Type u_1
n : Type u_11
m : Type u_12
inst✝⁴ : CommRing R
inst✝³ : DecidableEq m
inst✝² : Fintype m
inst✝¹ : DecidableEq n
inst✝ : Fintype n
M : Matrix m n R
h : M.SeparatingLeft
⊢ ((Matrix.toLinearMap₂' R) M).SeparatingLeft

Tactic:
simpa [SeparatingLeft, toLinearMap₂'_apply', separatingLeft_def] using h

Goal state after:
Module: Mathlib.Algebra.DirectSum.Internal

Goal state before:
pp: ι : Type u_1
σ : Type u_2
R : Type u_4
inst✝⁵ : DecidableEq ι
inst✝⁴ : Semiring R
inst✝³ : SetLike σ R
inst✝² : AddSubmonoidClass σ R
A : ι → σ
inst✝¹ : AddMonoid ι
inst✝ : SetLike.GradedMonoid A
r : ⨁ (i : ι), ↥(A i)
i : ι
r' : ↥(A i)
j n : ι
H : ∀ (x : ι), x + i = n ↔ x = j
⊢ (DFinsupp.sum r fun i₁ x₁ ↦ if i₁ + i = n then ↑x₁ * ↑r' else 0) = ↑(r j) * ↑r'

Tactic:
DFinsupp.sum,

Goal state after:
ι : Type u_1
σ : Type u_2
R : Type u_4
inst✝⁵ : DecidableEq ι
inst✝⁴ : Semiring R
inst✝³ : SetLike σ R
inst✝² : AddSubmonoidClass σ R
A : ι → σ
inst✝¹ : AddMonoid ι
inst✝ : SetLike.GradedMonoid A
r : ⨁ (i : ι), ↥(A i)
i : ι
r' : ↥(A i)
j n : ι
H : ∀ (x : ι), x + i = n ↔ x = j
⊢ (∑ x ∈ DFinsupp.support r, if x + i = n then ↑(r x) * ↑r' else 0) = ↑(r j) * ↑r'
Module: Mathlib.Algebra.DirectSum.Internal

Goal state before:
pp: ι : Type u_1
σ : Type u_2
R : Type u_4
inst✝⁷ : DecidableEq ι
inst✝⁶ : Semiring R
inst✝⁵ : SetLike σ R
inst✝⁴ : AddSubmonoidClass σ R
A : ι → σ
inst✝³ : AddCommMonoid ι
inst✝² : PartialOrder ι
inst✝¹ : CanonicallyOrderedAdd ι
inst✝ : SetLike.GradedMonoid A
i : ι
r : ↥(A i)
r' : ⨁ (i : ι), ↥(A i)
n : ι
h : ¬i ≤ n
⊢ (DFinsupp.sum r' fun j rj ↦ if i + j = n then ↑r * ↑rj else 0) = 0

Tactic:
DFinsupp.sum,

Goal state after:
ι : Type u_1
σ : Type u_2
R : Type u_4
inst✝⁷ : DecidableEq ι
inst✝⁶ : Semiring R
inst✝⁵ : SetLike σ R
inst✝⁴ : AddSubmonoidClass σ R
A : ι → σ
inst✝³ : AddCommMonoid ι
inst✝² : PartialOrder ι
inst✝¹ : CanonicallyOrderedAdd ι
inst✝ : SetLike.GradedMonoid A
i : ι
r : ↥(A i)
r' : ⨁ (i : ι), ↥(A i)
n : ι
h : ¬i ≤ n
⊢ (∑ i_1 ∈ DFinsupp.support r', if i + i_1 = n then ↑r * ↑(r' i_1) else 0) = 0
Module: Mathlib.Algebra.DirectSum.Internal

Goal state before:
pp: ι : Type u_1
σ : Type u_2
R : Type u_4
inst✝⁷ : DecidableEq ι
inst✝⁶ : Semiring R
inst✝⁵ : SetLike σ R
inst✝⁴ : AddSubmonoidClass σ R
A : ι → σ
inst✝³ : AddCommMonoid ι
inst✝² : PartialOrder ι
inst✝¹ : CanonicallyOrderedAdd ι
inst✝ : SetLike.GradedMonoid A
r : ⨁ (i : ι), ↥(A i)
i : ι
r' : ↥(A i)
n : ι
h : ¬i ≤ n
⊢ (DFinsupp.sum r fun i₁ x₁ ↦ if i₁ + i = n then ↑x₁ * ↑r' else 0) = 0

Tactic:
DFinsupp.sum,

Goal state after:
ι : Type u_1
σ : Type u_2
R : Type u_4
inst✝⁷ : DecidableEq ι
inst✝⁶ : Semiring R
inst✝⁵ : SetLike σ R
inst✝⁴ : AddSubmonoidClass σ R
A : ι → σ
inst✝³ : AddCommMonoid ι
inst✝² : PartialOrder ι
inst✝¹ : CanonicallyOrderedAdd ι
inst✝ : SetLike.GradedMonoid A
r : ⨁ (i : ι), ↥(A i)
i : ι
r' : ↥(A i)
n : ι
h : ¬i ≤ n
⊢ (∑ i_1 ∈ DFinsupp.support r, if i_1 + i = n then ↑(r i_1) * ↑r' else 0) = 0
Module: Mathlib.LinearAlgebra.CliffordAlgebra.Conjugation

Goal state before:
pp: R : Type u_1
inst✝² : CommRing R
M : Type u_2
inst✝¹ : AddCommGroup M
inst✝ : Module R M
Q : QuadraticForm R M
n : ZMod 2
⊢ Submodule.comap reverse (evenOdd Q n) = evenOdd Q n

Tactic:
rw [← submodule_map_reverse_eq_comap, evenOdd_map_reverse]

Goal state after:
Module: Mathlib.LinearAlgebra.CliffordAlgebra.Conjugation

Goal state before:
pp: case ι_mul_ι_mul
R : Type u_1
inst✝² : CommRing R
M : Type u_2
inst✝¹ : AddCommGroup M
inst✝ : Module R M
Q : QuadraticForm R M
x✝ : CliffordAlgebra Q
m₁ m₂ : M
x : CliffordAlgebra Q
_hx : x ∈ evenOdd Q 1
ihx : involute x = -x
⊢ -(ι Q) m₁ * -(ι Q) m₂ * -x = -((ι Q) m₁ * (ι Q) m₂ * x)

Tactic:
neg_mul_neg,

Goal state after:
case ι_mul_ι_mul
R : Type u_1
inst✝² : CommRing R
M : Type u_2
inst✝¹ : AddCommGroup M
inst✝ : Module R M
Q : QuadraticForm R M
x✝ : CliffordAlgebra Q
m₁ m₂ : M
x : CliffordAlgebra Q
_hx : x ∈ evenOdd Q 1
ihx : involute x = -x
⊢ (ι Q) m₁ * (ι Q) m₂ * -x = -((ι Q) m₁ * (ι Q) m₂ * x)
Module: Mathlib.LinearAlgebra.Multilinear.Curry

Goal state before:
pp: R : Type uR
S : Type uS
ι : Type uι
ι' : Type uι'
n : ℕ
M : Fin n.succ → Type v
M₁ : ι → Type v₁
M₂ : Type v₂
M₃ : Type v₃
M' : Type v'
inst✝⁶ : CommSemiring R
inst✝⁵ : (i : Fin n.succ) → AddCommMonoid (M i)
inst✝⁴ : AddCommMonoid M'
inst✝³ : AddCommMonoid M₂
inst✝² : (i : Fin n.succ) → Module R (M i)
inst✝¹ : Module R M'
inst✝ : Module R M₂
f : MultilinearMap R M M₂
x y : M 0
⊢ mk' (fun m ↦ f (Fin.cons (x + y) m)) ⋯ ⋯ = mk' (fun m ↦ f (Fin.cons x m)) ⋯ ⋯ + mk' (fun m ↦ f (Fin.cons y m)) ⋯ ⋯

Tactic:
ext m
    exact cons_add f m x y

Goal state after:
Module: Mathlib.LinearAlgebra.ExteriorAlgebra.Basic

Goal state before:
pp: R : Type u1
inst✝² : CommRing R
M : Type u2
inst✝¹ : AddCommGroup M
inst✝ : Module R M
n : ℕ
F : MultilinearMap R (fun x ↦ M) (ExteriorAlgebra R M) :=
  (MultilinearMap.mkPiAlgebraFin R n (ExteriorAlgebra R M)).compLinearMap fun x ↦ ι R
f : Fin n → M
x y : Fin n
hfxy : f x = f y
hxy : x ≠ y
⊢ F f = 0

Tactic:
dsimp [F]

Goal state after:
R : Type u1
inst✝² : CommRing R
M : Type u2
inst✝¹ : AddCommGroup M
inst✝ : Module R M
n : ℕ
F : MultilinearMap R (fun x ↦ M) (ExteriorAlgebra R M) :=
  (MultilinearMap.mkPiAlgebraFin R n (ExteriorAlgebra R M)).compLinearMap fun x ↦ ι R
f : Fin n → M
x y : Fin n
hfxy : f x = f y
hxy : x ≠ y
⊢ (List.ofFn fun i ↦ (ι R) (f i)).prod = 0
Module: Mathlib.LinearAlgebra.ExteriorAlgebra.Basic

Goal state before:
pp: R : Type u1
inst✝² : CommRing R
M : Type u2
inst✝¹ : AddCommGroup M
inst✝ : Module R M
n : ℕ
f : Fin n → ↑↑(ι R).range
hu : (List.ofFn fun i ↦ ↑(f i)).prod ∈ ↑(ι R).range ^ n
⊢ (List.ofFn fun i ↦ (ι R) (ιInv ↑(f i))).prod = (List.ofFn fun i ↦ ↑(f i)).prod

Tactic:
congr with i

Goal state after:
R : Type u1
inst✝² : CommRing R
M : Type u2
inst✝¹ : AddCommGroup M
inst✝ : Module R M
n : ℕ
f : Fin n → ↑↑(ι R).range
hu : (List.ofFn fun i ↦ ↑(f i)).prod ∈ ↑(ι R).range ^ n
i : Fin n
⊢ (ι R) (ιInv ↑(f i)) = ↑(f i)
Module: Mathlib.Algebra.Category.ModuleCat.Images

Goal state before:
pp: R : Type u
inst✝ : Ring R
G H : ModuleCat R
f : G ⟶ H
F' : MonoFactorisation f
c : R
x : ↥(Hom.hom f).range
⊢ (ConcreteCategory.hom F'.e) ↑(Classical.indefiniteDescription (fun x_1 ↦ (Hom.hom f) x_1 = ↑(c • x)) ⋯) =
    (RingHom.id R) c • (ConcreteCategory.hom F'.e) ↑(Classical.indefiniteDescription (fun x_1 ↦ (Hom.hom f) x_1 = ↑x) ⋯)

Tactic:
by
      apply (mono_iff_injective F'.m).1
      · infer_instance
      rw [map_smul]
      change (F'.e ≫ F'.m) _ = _ • (F'.e ≫ F'.m) _
      simp_rw [F'.fac, (Classical.indefiniteDescription (fun z => f z = _) _).2]
      rfl

Goal state after:
Module: Mathlib.CategoryTheory.Abelian.Injective.Dimension

Goal state before:
pp: C : Type u
inst✝¹ : Category.{v, u} C
inst✝ : Abelian C
S : ShortComplex C
hS : S.ShortExact
n : ℕ
h₂ : HasInjectiveDimensionLT S.X₂ n
h₃ : HasInjectiveDimensionLT S.X₁ (n + 1)
this : HasExt C := HasExt.standard C
⊢ ∀ (i : ℕ), n ≤ i → ∀ ⦃Y : C⦄ (e : Ext Y S.X₃ i), e = 0

Tactic:
intro i hi Y x₁

Goal state after:
C : Type u
inst✝¹ : Category.{v, u} C
inst✝ : Abelian C
S : ShortComplex C
hS : S.ShortExact
n : ℕ
h₂ : HasInjectiveDimensionLT S.X₂ n
h₃ : HasInjectiveDimensionLT S.X₁ (n + 1)
this : HasExt C := HasExt.standard C
i : ℕ
hi : n ≤ i
Y : C
x₁ : Ext Y S.X₃ i
⊢ x₁ = 0
Module: Mathlib.LinearAlgebra.ExteriorPower.Basic

Goal state before:
pp: R : Type u
inst✝⁶ : CommRing R
n : ℕ
M : Type u_1
N : Type u_2
N' : Type u_3
inst✝⁵ : AddCommGroup M
inst✝⁴ : Module R M
inst✝³ : AddCommGroup N
inst✝² : Module R N
inst✝¹ : AddCommGroup N'
inst✝ : Module R N'
⊢ ∀ (x y : R),
    ((x + y) • (ιMulti R 0) fun a ↦ Fin.casesOn a fun i hi ↦ ⋯.elim) =
      (x • (ιMulti R 0) fun a ↦ Fin.casesOn a fun i hi ↦ ⋯.elim) +
        y • (ιMulti R 0) fun a ↦ Fin.casesOn a fun i hi ↦ ⋯.elim

Tactic:
intros; simp only [add_smul]

Goal state after:
Module: Mathlib.CategoryTheory.Filtered.Final

Goal state before:
pp: C : Type u₁
inst✝² : Category.{v₁, u₁} C
D : Type u₂
inst✝¹ : Category.{v₂, u₂} D
F : C ⥤ D
inst✝ : IsCofilteredOrEmpty C
X : C × C
⊢ IsCofiltered (CostructuredArrow (Functor.diag C) X)

Tactic:
have : ∀ Y, IsCofiltered (CostructuredArrow (Over.forget X.1) Y) := by
    rw [← initial_iff_isCofiltered_costructuredArrow (Over.forget X.1)]
    infer_instance
  apply IsCofiltered.of_equivalence (CostructuredArrow.ofDiagEquivalence X).symm

Goal state after:
Module: Mathlib.CategoryTheory.Filtered.Final

Goal state before:
pp: case refine_2
C : Type u₁
inst✝¹ : Category.{v₁, u₁} C
inst✝ : IsFiltered C
F : C ⥤ Discrete PUnit.{u_1 + 1}
x✝² : Discrete PUnit.{u_1 + 1}
c : C
x✝¹ x✝ : x✝² ⟶ F.obj c
⊢ ∃ c' t, x✝¹ ≫ F.map t = x✝ ≫ F.map t

Tactic:
use c; use 𝟙 c
    apply Subsingleton.elim

Goal state after:
Module: Mathlib.CategoryTheory.Filtered.Final

Goal state before:
pp: case refine_2
C : Type u₁
inst✝¹ : Category.{v₁, u₁} C
inst✝ : IsCofiltered C
F : C ⥤ Discrete PUnit.{u_1 + 1}
x✝² : Discrete PUnit.{u_1 + 1}
c : C
x✝¹ x✝ : F.obj c ⟶ x✝²
⊢ ∃ c' t, F.map t ≫ x✝¹ = F.map t ≫ x✝

Tactic:
use c; use 𝟙 c
    apply Subsingleton.elim

Goal state after:
Module: Mathlib.CategoryTheory.Adjunction.PartialAdjoint

Goal state before:
pp: C : Type u₁
inst✝² : Category.{v₁, u₁} C
D : Type u₂
inst✝¹ : Category.{v₂, u₂} D
F : D ⥤ C
J : Type u_1
inst✝ : Category.{v_1, u_1} J
R : J ⥤ F.PartialLeftAdjointSource
c : Cocone (R ⋙ F.leftAdjointObjIsDefined.ι)
hc : IsColimit c
c' : Cocone (R ⋙ F.partialLeftAdjoint)
hc' : IsColimit c'
Y : D
f : c'.pt ⟶ Y
j j' : J
φ : j ⟶ j'
⊢ (R ⋙ F.leftAdjointObjIsDefined.ι).map φ ≫ F.partialLeftAdjointHomEquiv (c'.ι.app j' ≫ f) =
    F.partialLeftAdjointHomEquiv (c'.ι.app j ≫ f) ≫ ((const J).obj (F.1 Y)).map φ

Tactic:
by
            dsimp
            rw [comp_id, ← c'.w φ, ← partialLeftAdjointHomEquiv_map_comp, assoc]
            dsimp

Goal state after:
Module: Mathlib.CategoryTheory.Subfunctor.Basic

Goal state before:
pp: C : Type u
inst✝ : Category.{v, u} C
F F' F'' : C ⥤ Type w
G G' : Subfunctor F
⊢ IsIso ⊤.ι

Tactic:
refine @NatIso.isIso_of_isIso_app _ _ _ _ _ _ _ ?_

Goal state after:
C : Type u
inst✝ : Category.{v, u} C
F F' F'' : C ⥤ Type w
G G' : Subfunctor F
⊢ ∀ (X : C), IsIso (⊤.ι.app X)
Module: Mathlib.CategoryTheory.Sites.Pretopology

Goal state before:
pp: case mp
C : Type u
inst✝¹ : Category.{v, u} C
inst✝ : HasPullbacks C
K : Pretopology C
J : GrothendieckTopology C
⊢ K.toGrothendieck ≤ J → K ≤ J.toPretopology

Tactic:
intro h X R hR
      exact h _ ⟨_, hR, Sieve.le_generate R⟩

Goal state after:
Module: Mathlib.CategoryTheory.Sites.Sieves

Goal state before:
pp: C : Type u₁
inst✝¹ : Category.{v₁, u₁} C
D : Type u₂
inst✝ : Category.{v₂, u₂} D
F : C ⥤ D
X✝ Y✝ Z : C
f✝ : Y✝ ⟶ X✝
S R : Sieve X✝
I : Type u_1
Y : I → C
X Z₁ Z₂ : C
p : Z₁ ⟶ X
i : I
f : Z₁ ⟶ Y i
g : Z₂ ⟶ Z₁
⊢ ∃ i, Nonempty (Z₂ ⟶ Y i)

Tactic:
exact ⟨i, ⟨g ≫ f⟩⟩

Goal state after:
Module: Mathlib.CategoryTheory.Sites.Sieves

Goal state before:
pp: C : Type u₁
inst✝¹ : Category.{v₁, u₁} C
D : Type u₂
inst✝ : Category.{v₂, u₂} D
F : C ⥤ D
X : C
R : Presieve (F.obj X)
Z : C
g : Z ⟶ X
hg : Presieve.functorPullback F R g
⊢ (functorPullback F (generate R)).arrows g

Tactic:
exact le_generate _ _ _ hg

Goal state after:
Module: Mathlib.CategoryTheory.Sites.EqualizerSheafCondition

Goal state before:
pp: C : Type u
inst✝² : Category.{v, u} C
P : Cᵒᵖ ⥤ Type w
B : C
I : Type t
inst✝¹ : Small.{w, t} I
X : I → C
π : (i : I) → X i ⟶ B
inst✝ : (Presieve.ofArrows X π).HasPairwisePullbacks
⊢ IsSheafFor P (Presieve.ofArrows X π) ↔
    ∀ (y : FirstObj P X),
      (ConcreteCategory.hom (firstMap P X π)) y = (ConcreteCategory.hom (secondMap P X π)) y →
        ∃! x, (ConcreteCategory.hom (forkMap P X π)) x = y

Tactic:
isSheafFor_arrows_iff

Goal state after:
C : Type u
inst✝² : Category.{v, u} C
P : Cᵒᵖ ⥤ Type w
B : C
I : Type t
inst✝¹ : Small.{w, t} I
X : I → C
π : (i : I) → X i ⟶ B
inst✝ : (Presieve.ofArrows X π).HasPairwisePullbacks
⊢ (∀ (x : (i : I) → P.obj (op (X i))),
      Arrows.Compatible P π x → ∃! t, ∀ (i : I), (ConcreteCategory.hom (P.map (π i).op)) t = x i) ↔
    ∀ (y : FirstObj P X),
      (ConcreteCategory.hom (firstMap P X π)) y = (ConcreteCategory.hom (secondMap P X π)) y →
        ∃! x, (ConcreteCategory.hom (forkMap P X π)) x = y
Module: Mathlib.CategoryTheory.Sites.IsSheafFor

Goal state before:
pp: C : Type u₁
inst✝ : Category.{v₁, u₁} C
X : C
S : Sieve X
P : Cᵒᵖ ⥤ Type v₁
a : S.functor ⟶ P
b : yoneda.obj X ⟶ P
⊢ (shrinkFunctor.{v₁, v₁, u₁} S).ι ≫ (NatIso.ofComponents (fun Y ↦ shrinkYonedaObjObjEquiv.toIso) ⋯).hom ≫ b =
      S.shrinkFunctorIsoFunctor.hom ≫ a ↔
    S.functorInclusion ≫ b = a

Tactic:
NatTrans.ext_iff,

Goal state after:
C : Type u₁
inst✝ : Category.{v₁, u₁} C
X : C
S : Sieve X
P : Cᵒᵖ ⥤ Type v₁
a : S.functor ⟶ P
b : yoneda.obj X ⟶ P
⊢ ((shrinkFunctor.{v₁, v₁, u₁} S).ι ≫ (NatIso.ofComponents (fun Y ↦ shrinkYonedaObjObjEquiv.toIso) ⋯).hom ≫ b).app =
      (S.shrinkFunctorIsoFunctor.hom ≫ a).app ↔
    S.functorInclusion ≫ b = a
Module: Mathlib.CategoryTheory.Sites.Sieves

Goal state before:
pp: C : Type u₁
inst✝³ : Category.{v₁, u₁} C
D : Type u₂
inst✝² : Category.{v₂, u₂} D
F : C ⥤ D
X Y Z : C
f✝ : Y ⟶ X
S R : Sieve X
inst✝¹ : LocallySmall.{w, v₁, u₁} C
inst✝ : LocallySmall.{max w' w, v₁, u₁} C
U V : Cᵒᵖ
f : U ⟶ V
⊢ ((shrinkFunctor.{w, v₁, u₁} S).toFunctor ⋙ CategoryTheory.uliftFunctor.{w', w}).map f ≫
      (Equiv.ulift.trans ((shrinkYonedaObjObjEquiv.trans shrinkYonedaObjObjEquiv.symm).subtypeEquiv ⋯)).toIso.hom =
    (Equiv.ulift.trans ((shrinkYonedaObjObjEquiv.trans shrinkYonedaObjObjEquiv.symm).subtypeEquiv ⋯)).toIso.hom ≫
      (shrinkFunctor.{max w' w, v₁, u₁} S).toFunctor.map f

Tactic:
dsimp
      ext
      dsimp [Equiv.subtypeEquiv_apply]
      rw [shrinkYonedaObjObjEquiv_obj_map, shrinkYonedaObjObjEquiv_symm_comp]
      simp

Goal state after:
Module: Mathlib.CategoryTheory.Sites.IsSheafFor

Goal state before:
pp: C : Type u₁
inst✝ : Category.{v₁, u₁} C
X : C
S : Sieve X
P : Cᵒᵖ ⥤ Type v₁
a : S.functor ⟶ P
b : yoneda.obj X ⟶ P
⊢ ((shrinkFunctor.{v₁, v₁, u₁} S).ι ≫ (NatIso.ofComponents (fun Y ↦ shrinkYonedaObjObjEquiv.toIso) ⋯).hom ≫ b).app =
      (S.shrinkFunctorIsoFunctor.hom ≫ a).app ↔
    S.functorInclusion ≫ b = a

Tactic:
NatTrans.ext_iff,

Goal state after:
C : Type u₁
inst✝ : Category.{v₁, u₁} C
X : C
S : Sieve X
P : Cᵒᵖ ⥤ Type v₁
a : S.functor ⟶ P
b : yoneda.obj X ⟶ P
⊢ ((shrinkFunctor.{v₁, v₁, u₁} S).ι ≫ (NatIso.ofComponents (fun Y ↦ shrinkYonedaObjObjEquiv.toIso) ⋯).hom ≫ b).app =
      (S.shrinkFunctorIsoFunctor.hom ≫ a).app ↔
    (S.functorInclusion ≫ b).app = a.app
Module: Mathlib.CategoryTheory.Sites.IsSheafFor

Goal state before:
pp: C : Type u₁
inst✝ : Category.{v₁, u₁} C
P : Cᵒᵖ ⥤ Type w
B : C
I : Type u_1
X : I → C
π : (i : I) → X i ⟶ B
⊢ IsSheafFor P (ofArrows X π) ↔ Function.Bijective (Arrows.toCompatible P π)

Tactic:
isSheafFor_arrows_iff

Goal state after:
C : Type u₁
inst✝ : Category.{v₁, u₁} C
P : Cᵒᵖ ⥤ Type w
B : C
I : Type u_1
X : I → C
π : (i : I) → X i ⟶ B
⊢ (∀ (x : (i : I) → P.obj (op (X i))),
      Arrows.Compatible P π x → ∃! t, ∀ (i : I), (ConcreteCategory.hom (P.map (π i).op)) t = x i) ↔
    Function.Bijective (Arrows.toCompatible P π)