mathlib-initiative/mathlib-tactics huggingface dataset:
Module: Mathlib.RingTheory.Localization.AtPrime.Basic

Goal state before:
pp: S : Type u_6
R : Type u_7
inst✝⁸ : CommRing R
p : Ideal R
inst✝⁷ : p.IsMaximal
Sₚ : Type u_9
inst✝⁶ : CommRing S
inst✝⁵ : Algebra R S
inst✝⁴ : CommRing Sₚ
inst✝³ : Algebra S Sₚ
inst✝² : Algebra R Sₚ
inst✝¹ : IsLocalization (algebraMapSubmonoid S p.primeCompl) Sₚ
inst✝ : IsScalarTower R S Sₚ
x : S
hx : x ∈ comap (algebraMap S Sₚ) (Ideal.map (algebraMap S Sₚ) pS)
y : ↥pS
s : ↥(algebraMapSubmonoid S p.primeCompl)
hy : (algebraMap S Sₚ) (x * ↑(y, s).2) = (algebraMap S Sₚ) ↑(y, s).1
⊢ ∃ α ∉ p, α • x ∈ pS

Tactic:
IsLocalization.eq_iff_exists (Algebra.algebraMapSubmonoid S p.primeCompl)

Goal state after:
S : Type u_6
R : Type u_7
inst✝⁸ : CommRing R
p : Ideal R
inst✝⁷ : p.IsMaximal
Sₚ : Type u_9
inst✝⁶ : CommRing S
inst✝⁵ : Algebra R S
inst✝⁴ : CommRing Sₚ
inst✝³ : Algebra S Sₚ
inst✝² : Algebra R Sₚ
inst✝¹ : IsLocalization (algebraMapSubmonoid S p.primeCompl) Sₚ
inst✝ : IsScalarTower R S Sₚ
x : S
hx : x ∈ comap (algebraMap S Sₚ) (Ideal.map (algebraMap S Sₚ) pS)
y : ↥pS
s : ↥(algebraMapSubmonoid S p.primeCompl)
hy : ∃ c, ↑c * (x * ↑(y, s).2) = ↑c * ↑(y, s).1
⊢ ∃ α ∉ p, α • x ∈ pS
Module: Mathlib.RingTheory.Localization.AtPrime.Basic

Goal state before:
pp: S : Type u_6
R : Type u_7
inst✝⁸ : CommRing R
p : Ideal R
inst✝⁷ : p.IsMaximal
Sₚ : Type u_9
inst✝⁶ : CommRing S
inst✝⁵ : Algebra R S
inst✝⁴ : CommRing Sₚ
inst✝³ : Algebra S Sₚ
inst✝² : Algebra R Sₚ
inst✝¹ : IsLocalization (algebraMapSubmonoid S p.primeCompl) Sₚ
inst✝ : IsScalarTower R S Sₚ
x : S
hx : x ∈ comap (algebraMap S Sₚ) (Ideal.map (algebraMap S Sₚ) pS)
α : R
hα : α ∉ p
hαx : α • x ∈ pS
β γ : R
hγ : γ ∈ p
hβ : β * α = 1 + γ
⊢ x ∈ pS

Tactic:
have := Ideal.mul_mem_left _ (algebraMap _ _ β) hαx

Goal state after:
S : Type u_6
R : Type u_7
inst✝⁸ : CommRing R
p : Ideal R
inst✝⁷ : p.IsMaximal
Sₚ : Type u_9
inst✝⁶ : CommRing S
inst✝⁵ : Algebra R S
inst✝⁴ : CommRing Sₚ
inst✝³ : Algebra S Sₚ
inst✝² : Algebra R Sₚ
inst✝¹ : IsLocalization (algebraMapSubmonoid S p.primeCompl) Sₚ
inst✝ : IsScalarTower R S Sₚ
x : S
hx : x ∈ comap (algebraMap S Sₚ) (Ideal.map (algebraMap S Sₚ) pS)
α : R
hα : α ∉ p
hαx : α • x ∈ pS
β γ : R
hγ : γ ∈ p
hβ : β * α = 1 + γ
this : (algebraMap R S) β * α • x ∈ pS
⊢ x ∈ pS
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 : IsStableUnderBaseChange P
R S : Type u
inst✝⁷ : CommRing R
inst✝⁶ : CommRing S
f : R →+* S
M : Submonoid R
R' S' : Type u
inst✝⁵ : CommRing R'
inst✝⁴ : CommRing S'
inst✝³ : Algebra R R'
inst✝² : Algebra S S'
inst✝¹ : IsLocalization M R'
inst✝ : IsLocalization (Submonoid.map f M) S'
hf : P f
⊢ P (IsLocalization.map S' f ⋯)

Tactic:
exact hP.isLocalization_map _ _ hf

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

Goal state before:
pp: m : Type u_1
R : Type u_3
inst✝² : DecidableEq m
inst✝¹ : Fintype m
inst✝ : CommRing R
s : m × m → R
⊢ (MvPolynomial.eval s).mapMatrix (mvPolynomialX m m R) = of fun i j ↦ s (i, j)

Tactic:
ext i j

Goal state after:
m : Type u_1
R : Type u_3
inst✝² : DecidableEq m
inst✝¹ : Fintype m
inst✝ : CommRing R
s : m × m → R
i j : m
⊢ (MvPolynomial.eval s).mapMatrix (mvPolynomialX m m R) i j = of (fun i j ↦ s (i, j)) i j
Module: Mathlib.RingTheory.Localization.AtPrime.Basic

Goal state before:
pp: R : Type u_1
inst✝⁴ : CommSemiring R
S : Type u_2
inst✝³ : CommSemiring S
inst✝² : Algebra R S
I p : Ideal R
inst✝¹ : p.IsPrime
inst✝ : IsLocalization.AtPrime S p
hle : ¬I ≤ p
⊢ ¬↑I ⊆ (↑p.primeCompl)ᶜ

Tactic:
simpa [SetLike.le_def, Set.not_subset_iff_exists_mem_notMem] using hle

Goal state after:
Module: Mathlib.Algebra.Polynomial.Laurent

Goal state before:
pp: case add
R : Type u_1
inst✝ : Semiring R
r : R
p✝ q✝ : R[T;T⁻¹]
hp : r • p✝ = C r * p✝
hq : r • q✝ = C r * q✝
⊢ r • (p✝ + q✝) = C r * (p✝ + q✝)

Tactic:
smul_add,

Goal state after:
case add
R : Type u_1
inst✝ : Semiring R
r : R
p✝ q✝ : R[T;T⁻¹]
hp : r • p✝ = C r * p✝
hq : r • q✝ = C r * q✝
⊢ r • p✝ + r • q✝ = C r * (p✝ + q✝)
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
⊢ cramer 1 = 1

Tactic:
ext i j

Goal state after:
n : Type v
α : Type w
inst✝² : DecidableEq n
inst✝¹ : Fintype n
inst✝ : CommRing α
i j : n
⊢ (cramer 1 ∘ₗ LinearMap.single α (fun i ↦ α) i) 1 j = (1 ∘ₗ LinearMap.single α (fun i ↦ α) i) 1 j
Module: Mathlib.LinearAlgebra.Matrix.Adjugate

Goal state before:
pp: n : Type v
α : Type w
inst✝³ : DecidableEq n
inst✝² : Fintype n
inst✝¹ : CommRing α
inst✝ : Nontrivial n
⊢ cramer 0 = 0

Tactic:
ext i j

Goal state after:
n : Type v
α : Type w
inst✝³ : DecidableEq n
inst✝² : Fintype n
inst✝¹ : CommRing α
inst✝ : Nontrivial n
i j : n
⊢ (cramer 0 ∘ₗ LinearMap.single α (fun i ↦ α) i) 1 j = (0 ∘ₗ LinearMap.single α (fun i ↦ α) i) 1 j
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
⊢ A.adjugateᵀ = Aᵀ.adjugate

Tactic:
ext i j

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
i j : n
⊢ A.adjugateᵀ i j = Aᵀ.adjugate i j
Module: Mathlib.LinearAlgebra.Matrix.Adjugate

Goal state before:
pp: case pos.e_f
n : Type v
α : Type w
inst✝² : DecidableEq n
inst✝¹ : Fintype n
inst✝ : CommRing α
A : Matrix n n α
j : n
σ : Perm n
a✝ : σ ∈ univ
j' : n
this : σ j' = σ j ↔ j' = j
⊢ (if x : j' = j then Pi.single j 1 j' else A (σ j') j') = if j' = j then Pi.single (σ j) 1 (σ j') else A (σ j') j'

Tactic:
← dite_eq_ite

Goal state after:
case pos.e_f
n : Type v
α : Type w
inst✝² : DecidableEq n
inst✝¹ : Fintype n
inst✝ : CommRing α
A : Matrix n n α
j : n
σ : Perm n
a✝ : σ ∈ univ
j' : n
this : σ j' = σ j ↔ j' = j
⊢ (if x : j' = j then Pi.single j 1 j' else A (σ j') j') = if x : j' = j then Pi.single (σ j) 1 (σ j') else A (σ j') j'
Module: Mathlib.LinearAlgebra.Matrix.Adjugate

Goal state before:
pp: case neg
n : Type v
α : Type w
inst✝² : DecidableEq n
inst✝¹ : Fintype n
inst✝ : CommRing α
A : Matrix n n α
i j : n
σ : Perm n
a✝ : σ ∈ univ
h : ¬i = σ j
this : ∏ j', A.updateCol j (Pi.single i 1) (σ j') j' = 0
⊢ Pi.single j 1 ((Equiv.symm σ) i) = 0

Tactic:
apply Pi.single_eq_of_ne

Goal state after:
case neg
n : Type v
α : Type w
inst✝² : DecidableEq n
inst✝¹ : Fintype n
inst✝ : CommRing α
A : Matrix n n α
i j : n
σ : Perm n
a✝ : σ ∈ univ
h : ¬i = σ j
this : ∏ j', A.updateCol j (Pi.single i 1) (σ j') j' = 0
⊢ (Equiv.symm σ) i ≠ j
Module: Mathlib.LinearAlgebra.Matrix.Adjugate

Goal state before:
pp: m : Type u
n : Type v
α : Type w
inst✝⁴ : DecidableEq n
inst✝³ : Fintype n
inst✝² : DecidableEq m
inst✝¹ : Fintype m
inst✝ : CommRing α
e : n ≃ m
A : Matrix m m α
⊢ (A.submatrix ⇑e ⇑e).adjugate = A.adjugate.submatrix ⇑e ⇑e

Tactic:
ext i j

Goal state after:
m : Type u
n : Type v
α : Type w
inst✝⁴ : DecidableEq n
inst✝³ : Fintype n
inst✝² : DecidableEq m
inst✝¹ : Fintype m
inst✝ : CommRing α
e : n ≃ m
A : Matrix m m α
i j : n
⊢ (A.submatrix ⇑e ⇑e).adjugate i j = A.adjugate.submatrix (⇑e) (⇑e) i j
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
⊢ A * A.adjugate = A.det • 1

Tactic:
ext i j

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
i j : n
⊢ (A * A.adjugate) i j = (A.det • 1) i j
Module: Mathlib.LinearAlgebra.Matrix.Adjugate

Goal state before:
pp: n : Type v
α : Type w
inst✝³ : DecidableEq n
inst✝² : Fintype n
inst✝¹ : CommRing α
inst✝ : Subsingleton n
A : Matrix n n α
⊢ A.adjugate = 1

Tactic:
ext i j

Goal state after:
n : Type v
α : Type w
inst✝³ : DecidableEq n
inst✝² : Fintype n
inst✝¹ : CommRing α
inst✝ : Subsingleton n
A : Matrix n n α
i j : n
⊢ A.adjugate i j = 1 i j
Module: Mathlib.LinearAlgebra.Matrix.Adjugate

Goal state before:
pp: n : Type v
α : Type w
inst✝³ : DecidableEq n
inst✝² : Fintype n
inst✝¹ : CommRing α
inst✝ : Nontrivial n
⊢ adjugate 0 = 0

Tactic:
ext i j

Goal state after:
n : Type v
α : Type w
inst✝³ : DecidableEq n
inst✝² : Fintype n
inst✝¹ : CommRing α
inst✝ : Nontrivial n
i j : n
⊢ adjugate 0 i j = 0 i j
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
v : n → α
⊢ (diagonal v).adjugate = diagonal fun i ↦ ∏ j ∈ univ.erase i, v j

Tactic:
ext i j

Goal state after:
n : Type v
α : Type w
inst✝² : DecidableEq n
inst✝¹ : Fintype n
inst✝ : CommRing α
v : n → α
i j : n
⊢ (diagonal v).adjugate i j = diagonal (fun i ↦ ∏ j ∈ univ.erase i, v j) i j
Module: Mathlib.Algebra.Polynomial.Laurent

Goal state before:
pp: case add
R : Type u_1
S : Type u_2
inst✝³ : Semiring R
inst✝² : AddCommMonoid S
inst✝¹ : Module R S
inst✝ : Monoid S
f : R[T;T⁻¹]
x : Sˣ
r : R
p q : R[T;T⁻¹]
hp : (C r * p).smeval x = r • p.smeval x
hq : (C r * q).smeval x = r • q.smeval x
⊢ (C r * p).smeval x + (C r * q).smeval x = r • (p.smeval x + q.smeval x)

Tactic:
smul_add,

Goal state after:
case add
R : Type u_1
S : Type u_2
inst✝³ : Semiring R
inst✝² : AddCommMonoid S
inst✝¹ : Module R S
inst✝ : Monoid S
f : R[T;T⁻¹]
x : Sˣ
r : R
p q : R[T;T⁻¹]
hp : (C r * p).smeval x = r • p.smeval x
hq : (C r * q).smeval x = r • q.smeval x
⊢ (C r * p).smeval x + (C r * q).smeval x = r • p.smeval x + r • q.smeval x
Module: Mathlib.LinearAlgebra.Matrix.Adjugate

Goal state before:
pp: α : Type w
inst✝ : CommRing α
A : Matrix (Fin 2) (Fin 2) α
⊢ A.adjugate = !![A 1 1, -A 0 1; -A 1 0, A 0 0]

Tactic:
ext i j

Goal state after:
α : Type w
inst✝ : CommRing α
A : Matrix (Fin 2) (Fin 2) α
i j : Fin 2
⊢ A.adjugate i j = !![A 1 1, -A 0 1; -A 1 0, A 0 0] i j
Module: Mathlib.LinearAlgebra.Matrix.Adjugate

Goal state before:
pp: α : Type w
inst✝ : CommRing α
A : Matrix (Fin 3) (Fin 3) α
⊢ A.adjugate =
    !![A 1 1 * A 2 2 - A 1 2 * A 2 1, -(A 0 1 * A 2 2) + A 0 2 * A 2 1, A 0 1 * A 1 2 - A 0 2 * A 1 1;
      -(A 1 0 * A 2 2) + A 1 2 * A 2 0, A 0 0 * A 2 2 - A 0 2 * A 2 0, -(A 0 0 * A 1 2) + A 0 2 * A 1 0;
      A 1 0 * A 2 1 - A 1 1 * A 2 0, -(A 0 0 * A 2 1) + A 0 1 * A 2 0, A 0 0 * A 1 1 - A 0 1 * A 1 0]

Tactic:
ext i j

Goal state after:
α : Type w
inst✝ : CommRing α
A : Matrix (Fin 3) (Fin 3) α
i j : Fin 3
⊢ A.adjugate i j =
    !![A 1 1 * A 2 2 - A 1 2 * A 2 1, -(A 0 1 * A 2 2) + A 0 2 * A 2 1, A 0 1 * A 1 2 - A 0 2 * A 1 1;
        -(A 1 0 * A 2 2) + A 1 2 * A 2 0, A 0 0 * A 2 2 - A 0 2 * A 2 0, -(A 0 0 * A 1 2) + A 0 2 * A 1 0;
        A 1 0 * A 2 1 - A 1 1 * A 2 0, -(A 0 0 * A 2 1) + A 0 1 * A 2 0, A 0 0 * A 1 1 - A 0 1 * A 1 0]
      i j
Module: Mathlib.LinearAlgebra.Matrix.Trace

Goal state before:
pp: m : Type u_2
n : Type u_3
R : Type u_6
inst✝² : Fintype m
inst✝¹ : Fintype n
inst✝ : NonAssocSemiring R
A B : Matrix m n R
h : ∀ (x : Matrix n m R), (x * A).trace = (x * B).trace
⊢ A = B

Tactic:
ext i j

Goal state after:
m : Type u_2
n : Type u_3
R : Type u_6
inst✝² : Fintype m
inst✝¹ : Fintype n
inst✝ : NonAssocSemiring R
A B : Matrix m n R
h : ∀ (x : Matrix n m R), (x * A).trace = (x * B).trace
i : m
j : n
⊢ A i j = B i j
Module: Mathlib.LinearAlgebra.Matrix.Trace

Goal state before:
pp: m : Type u_2
n : Type u_3
R : Type u_6
inst✝² : Fintype m
inst✝¹ : Fintype n
inst✝ : NonAssocSemiring R
A B : Matrix m n R
h : ∀ (x : Matrix n m R), (A * x).trace = (B * x).trace
⊢ A = B

Tactic:
ext i j

Goal state after:
m : Type u_2
n : Type u_3
R : Type u_6
inst✝² : Fintype m
inst✝¹ : Fintype n
inst✝ : NonAssocSemiring R
A B : Matrix m n R
h : ∀ (x : Matrix n m R), (A * x).trace = (B * x).trace
i : m
j : n
⊢ A i j = B i j
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
hA : IsLeftRegular A.det
hB : IsLeftRegular B.det
hAB : IsLeftRegular (A * B).det
⊢ (A * B).adjugate = B.adjugate * A.adjugate

Tactic:
refine (isRegular_of_isLeftRegular_det hAB).left ?_

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
hA : IsLeftRegular A.det
hB : IsLeftRegular B.det
hAB : IsLeftRegular (A * B).det
⊢ (fun x ↦ A * B * x) (A * B).adjugate = (fun x ↦ A * B * x) (B.adjugate * A.adjugate)
Module: Mathlib.LinearAlgebra.Matrix.Invertible

Goal state before:
pp: m : Type u_1
n : Type u_2
α : Type u_3
inst✝⁶ : Fintype n
inst✝⁵ : DecidableEq n
inst✝⁴ : Fintype m
inst✝³ : DecidableEq m
inst✝² : Ring α
A : Matrix n n α
U : Matrix n m α
C : Matrix m m α
V : Matrix m n α
inst✝¹ : Invertible A
inst✝ : Invertible (C + C * V * ⅟A * U * C)
⊢ 1 - ⅟A * U * C * ⅟(C + C * V * ⅟A * U * C) * C * V * ⅟A * A +
      (⅟A * (U * C * V) - ⅟A * U * C * ⅟(C + C * V * ⅟A * U * C) * C * V * ⅟A * (U * C * V)) =
    1

Tactic:
rw [sub_add, sub_eq_self, sub_eq_zero]

Goal state after:
m : Type u_1
n : Type u_2
α : Type u_3
inst✝⁶ : Fintype n
inst✝⁵ : DecidableEq n
inst✝⁴ : Fintype m
inst✝³ : DecidableEq m
inst✝² : Ring α
A : Matrix n n α
U : Matrix n m α
C : Matrix m m α
V : Matrix m n α
inst✝¹ : Invertible A
inst✝ : Invertible (C + C * V * ⅟A * U * C)
⊢ ⅟A * U * C * ⅟(C + C * V * ⅟A * U * C) * C * V * ⅟A * A =
    ⅟A * (U * C * V) - ⅟A * U * C * ⅟(C + C * V * ⅟A * U * C) * C * V * ⅟A * (U * C * V)
Module: Mathlib.LinearAlgebra.Matrix.Block

Goal state before:
pp: α : Type u_1
m : Type u_3
R : Type v
b : m → α
inst✝¹ : LT α
inst✝ : NegZeroClass R
M : Matrix m m R
hM : M.BlockTriangular b
x✝¹ x✝ : m
h : b x✝ < b x✝¹
⊢ -0 = 0

Tactic:
neg_zero

Goal state after:
α : Type u_1
m : Type u_3
R : Type v
b : m → α
inst✝¹ : LT α
inst✝ : NegZeroClass R
M : Matrix m m R
hM : M.BlockTriangular b
x✝¹ x✝ : m
h : b x✝ < b x✝¹
⊢ 0 = 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
A : Matrix n n α
⊢ A⁻¹ * A = 1 ∧ A * A⁻¹ = 1 ∨ A⁻¹ = 0

Tactic:
by_cases h : IsUnit A.det

Goal state after:
case pos
n : Type u'
α : Type v
inst✝² : Fintype n
inst✝¹ : DecidableEq n
inst✝ : CommRing α
A : Matrix n n α
h : IsUnit A.det
⊢ A⁻¹ * A = 1 ∧ A * A⁻¹ = 1 ∨ A⁻¹ = 0

case neg
n : Type u'
α : Type v
inst✝² : Fintype n
inst✝¹ : DecidableEq n
inst✝ : CommRing α
A : Matrix n n α
h : ¬IsUnit A.det
⊢ A⁻¹ * A = 1 ∧ A * A⁻¹ = 1 ∨ A⁻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
A : Matrix n n α
⊢ A⁻¹.det = A.det⁻¹ʳ

Tactic:
by_cases h : IsUnit A.det

Goal state after:
case pos
n : Type u'
α : Type v
inst✝² : Fintype n
inst✝¹ : DecidableEq n
inst✝ : CommRing α
A : Matrix n n α
h : IsUnit A.det
⊢ A⁻¹.det = A.det⁻¹ʳ

case neg
n : Type u'
α : Type v
inst✝² : Fintype n
inst✝¹ : DecidableEq n
inst✝ : CommRing α
A : Matrix n n α
h : ¬IsUnit A.det
⊢ A⁻¹.det = A.det⁻¹ʳ
Module: Mathlib.LinearAlgebra.Matrix.Block

Goal state before:
pp: case e'_2
m : Type u_3
R : Type v
inst✝³ : CommRing R
inst✝² : DecidableEq m
inst✝¹ : Fintype m
M : Matrix m m R
p : m → Prop
inst✝ : DecidablePred p
h : ∀ (i : m), ¬p i → ∀ (j : m), p j → M i j = 0
⊢ M.toBlock (fun j ↦ ¬p j) p = 0

Tactic:
ext i j

Goal state after:
case e'_2
m : Type u_3
R : Type v
inst✝³ : CommRing R
inst✝² : DecidableEq m
inst✝¹ : Fintype m
M : Matrix m m R
p : m → Prop
inst✝ : DecidablePred p
h : ∀ (i : m), ¬p i → ∀ (j : m), p j → M i j = 0
i : { a // ¬p a }
j : { a // p a }
⊢ M.toBlock (fun j ↦ ¬p j) p i j = 0 i j
Module: Mathlib.LinearAlgebra.Matrix.Transvection

Goal state before:
pp: case left
𝕜 : Type u_3
inst✝ : Field 𝕜
r : ℕ
M : Matrix (Fin r ⊕ Unit) (Fin r ⊕ Unit) 𝕜
hM : M (inr ()) (inr ()) ≠ 0
⊢ ((listTransvecCol M).prod * M * (listTransvecRow M).prod).toBlocks₁₂ = 0

Tactic:
ext i j

Goal state after:
case left
𝕜 : Type u_3
inst✝ : Field 𝕜
r : ℕ
M : Matrix (Fin r ⊕ Unit) (Fin r ⊕ Unit) 𝕜
hM : M (inr ()) (inr ()) ≠ 0
i : Fin r
j : Unit
⊢ ((listTransvecCol M).prod * M * (listTransvecRow M).prod).toBlocks₁₂ i j = 0 i j
Module: Mathlib.LinearAlgebra.Matrix.Transvection

Goal state before:
pp: case left
𝕜 : Type u_3
inst✝ : Field 𝕜
r : ℕ
M : Matrix (Fin r ⊕ Unit) (Fin r ⊕ Unit) 𝕜
hM : M (inr ()) (inr ()) ≠ 0
i : Fin r
j : Unit
this : j = ()
⊢ ((listTransvecCol M).prod * M * (listTransvecRow M).prod).toBlocks₁₂ i j = 0 i j

Tactic:
simp [toBlocks₁₂, this, listTransvecCol_mul_mul_listTransvecRow_last_row M hM]

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

Goal state before:
pp: case right
𝕜 : Type u_3
inst✝ : Field 𝕜
r : ℕ
M : Matrix (Fin r ⊕ Unit) (Fin r ⊕ Unit) 𝕜
hM : M (inr ()) (inr ()) ≠ 0
⊢ ((listTransvecCol M).prod * M * (listTransvecRow M).prod).toBlocks₂₁ = 0

Tactic:
ext i j

Goal state after:
case right
𝕜 : Type u_3
inst✝ : Field 𝕜
r : ℕ
M : Matrix (Fin r ⊕ Unit) (Fin r ⊕ Unit) 𝕜
hM : M (inr ()) (inr ()) ≠ 0
i : Unit
j : Fin r
⊢ ((listTransvecCol M).prod * M * (listTransvecRow M).prod).toBlocks₂₁ i j = 0 i j
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
A : Matrix n n α
⊢ A⁻¹⁻¹⁻¹ = A⁻¹

Tactic:
by_cases h : IsUnit A.det

Goal state after:
case pos
n : Type u'
α : Type v
inst✝² : Fintype n
inst✝¹ : DecidableEq n
inst✝ : CommRing α
A : Matrix n n α
h : IsUnit A.det
⊢ A⁻¹⁻¹⁻¹ = A⁻¹

case neg
n : Type u'
α : Type v
inst✝² : Fintype n
inst✝¹ : DecidableEq n
inst✝ : CommRing α
A : Matrix n n α
h : ¬IsUnit A.det
⊢ A⁻¹⁻¹⁻¹ = A⁻¹
Module: Mathlib.LinearAlgebra.Matrix.Block

Goal state before:
pp: case H.inr
α : Type u_1
R : Type v
inst✝⁴ : CommRing R
inst✝³ : DecidableEq α
inst✝² : LinearOrder α
m : Type u_3
M : Matrix m m R
b : m → α
inst✝¹ : DecidableEq m
inst✝ : Fintype m
hM : M.BlockTriangular b
ih :
  ∀ s ∈ image b univ,
    ∀ {m_1 : Type u_3} {M : Matrix m_1 m_1 R} {b_1 : m_1 → α} [inst : DecidableEq m_1] [inst_1 : Fintype m_1],
      M.BlockTriangular b_1 →
        image b_1 univ = (image b univ).erase s → M.det = ∏ a ∈ (image b univ).erase s, (M.toSquareBlock b_1 a).det
h✝ : Nonempty m
k : α := (image b univ).max' ⋯
this : image b univ = insert k ((image b univ).erase k)
⊢ (M.toSquareBlockProp fun i ↦ ¬b i = k).det = ∏ x ∈ (image b univ).erase k, (M.toSquareBlock b x).det

Tactic:
let b' := fun i : { a // b a ≠ k } => b ↑i

Goal state after:
case H.inr
α : Type u_1
R : Type v
inst✝⁴ : CommRing R
inst✝³ : DecidableEq α
inst✝² : LinearOrder α
m : Type u_3
M : Matrix m m R
b : m → α
inst✝¹ : DecidableEq m
inst✝ : Fintype m
hM : M.BlockTriangular b
ih :
  ∀ s ∈ image b univ,
    ∀ {m_1 : Type u_3} {M : Matrix m_1 m_1 R} {b_1 : m_1 → α} [inst : DecidableEq m_1] [inst_1 : Fintype m_1],
      M.BlockTriangular b_1 →
        image b_1 univ = (image b univ).erase s → M.det = ∏ a ∈ (image b univ).erase s, (M.toSquareBlock b_1 a).det
h✝ : Nonempty m
k : α := (image b univ).max' ⋯
this : image b univ = insert k ((image b univ).erase k)
b' : { a // b a ≠ k } → α := fun i ↦ b ↑i
⊢ (M.toSquareBlockProp fun i ↦ ¬b i = k).det = ∏ x ∈ (image b univ).erase k, (M.toSquareBlock b x).det
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
A : Matrix n n α
Xs : List (Matrix n n α)
⊢ (A :: Xs).prod⁻¹ = ((List.map Inv.inv Xs.reverse).concat A⁻¹).prod

Tactic:
List.prod_concat,

Goal state after:
n : Type u'
α : Type v
inst✝² : Fintype n
inst✝¹ : DecidableEq n
inst✝ : CommRing α
A : Matrix n n α
Xs : List (Matrix n n α)
⊢ (A :: Xs).prod⁻¹ = (List.map Inv.inv Xs.reverse).prod * A⁻¹
Module: Mathlib.LinearAlgebra.Matrix.Block

Goal state before:
pp: m : Type u_3
R : Type v
M : Matrix m m R
inst✝³ : CommRing R
inst✝² : DecidableEq m
inst✝¹ : Fintype m
inst✝ : LinearOrder m
h : M.IsUpperTriangular
⊢ M.det = ∏ i, M i i

Tactic:
have : DecidableEq R := Classical.decEq _

Goal state after:
m : Type u_3
R : Type v
M : Matrix m m R
inst✝³ : CommRing R
inst✝² : DecidableEq m
inst✝¹ : Fintype m
inst✝ : LinearOrder m
h : M.IsUpperTriangular
this : DecidableEq R
⊢ M.det = ∏ i, M i i
Module: Mathlib.LinearAlgebra.Matrix.Block

Goal state before:
pp: α : Type u_1
m : Type u_3
R : Type v
M : Matrix m m R
b : m → α
inst✝⁴ : CommRing R
inst✝³ : DecidableEq m
inst✝² : Fintype m
inst✝¹ : LinearOrder α
inst✝ : Invertible M
hM : M.BlockTriangular b
k : α
p : m → Prop := fun i ↦ b i < k
h_sum : M⁻¹.toBlock p p * M.toBlock p p + (M⁻¹.toBlock p fun i ↦ ¬p i) * M.toBlock (fun i ↦ ¬p i) p = 1
⊢ M.toBlock (fun i ↦ ¬p i) p = 0

Tactic:
ext i j

Goal state after:
α : Type u_1
m : Type u_3
R : Type v
M : Matrix m m R
b : m → α
inst✝⁴ : CommRing R
inst✝³ : DecidableEq m
inst✝² : Fintype m
inst✝¹ : LinearOrder α
inst✝ : Invertible M
hM : M.BlockTriangular b
k : α
p : m → Prop := fun i ↦ b i < k
h_sum : M⁻¹.toBlock p p * M.toBlock p p + (M⁻¹.toBlock p fun i ↦ ¬p i) * M.toBlock (fun i ↦ ¬p i) p = 1
i : { a // ¬p a }
j : { a // p a }
⊢ M.toBlock (fun i ↦ ¬p i) p i j = 0 i j
Module: Mathlib.LinearAlgebra.Matrix.Block

Goal state before:
pp: α : Type u_1
m : Type u_3
R : Type v
M : Matrix m m R
b : m → α
inst✝⁴ : CommRing R
inst✝³ : DecidableEq m
inst✝² : Fintype m
inst✝¹ : LinearOrder α
inst✝ : Invertible M
hM : M.BlockTriangular b
k : α
p : m → Prop := fun i ↦ b i < k
q : m → Prop := fun i ↦ ¬b i < k
⊢ Disjoint q p

Tactic:
rw [disjoint_iff_inf_le]

Goal state after:
α : Type u_1
m : Type u_3
R : Type v
M : Matrix m m R
b : m → α
inst✝⁴ : CommRing R
inst✝³ : DecidableEq m
inst✝² : Fintype m
inst✝¹ : LinearOrder α
inst✝ : Invertible M
hM : M.BlockTriangular b
k : α
p : m → Prop := fun i ↦ b i < k
q : m → Prop := fun i ↦ ¬b i < k
⊢ q ⊓ p ≤ ⊥
Module: Mathlib.LinearAlgebra.Matrix.Block

Goal state before:
pp: α : Type u_1
m : Type u_3
R : Type v
M : Matrix m m R
b : m → α
inst✝⁴ : CommRing R
inst✝³ : DecidableEq m
inst✝² : Fintype m
inst✝¹ : LinearOrder α
inst✝ : Invertible M
hM : M.BlockTriangular b
k : α
p : m → Prop := fun i ↦ b i < k
q : m → Prop := fun i ↦ ¬b i < k
h_sum : M⁻¹.toBlock q p * M.toBlock p p + M⁻¹.toBlock q q * M.toBlock q p = 0
⊢ M.toBlock q p = 0

Tactic:
ext i j

Goal state after:
α : Type u_1
m : Type u_3
R : Type v
M : Matrix m m R
b : m → α
inst✝⁴ : CommRing R
inst✝³ : DecidableEq m
inst✝² : Fintype m
inst✝¹ : LinearOrder α
inst✝ : Invertible M
hM : M.BlockTriangular b
k : α
p : m → Prop := fun i ↦ b i < k
q : m → Prop := fun i ↦ ¬b i < k
h_sum : M⁻¹.toBlock q p * M.toBlock p p + M⁻¹.toBlock q q * M.toBlock q p = 0
i : { a // q a }
j : { a // p a }
⊢ M.toBlock q p i j = 0 i j
Module: Mathlib.LinearAlgebra.Matrix.NonsingularInverse

Goal state before:
pp: case neg.inr
m : Type u
n : Type u'
α : Type v
inst✝⁴ : Fintype n
inst✝³ : DecidableEq n
inst✝² : CommRing α
inst✝¹ : Fintype m
inst✝ : DecidableEq m
A : Matrix m m α
B : Matrix n n α
hA : IsUnit A.det
hB : ¬IsUnit B.det
h✝ : Nonempty m
hAB : ¬IsUnit (kroneckerMap (fun x1 x2 ↦ x1 * x2) A B).det
⊢ (kroneckerMap (fun x1 x2 ↦ x1 * x2) A B)⁻¹ = kroneckerMap (fun x1 x2 ↦ x1 * x2) A⁻¹ B⁻¹

Tactic:
rw [nonsing_inv_apply_not_isUnit _ hB, kronecker_zero, nonsing_inv_apply_not_isUnit _ hAB]

Goal state after:
Module: Mathlib.RingTheory.MatrixPolynomialAlgebra

Goal state before:
pp: R : Type u_1
inst✝² : CommSemiring R
n : Type w
inst✝¹ : DecidableEq n
inst✝ : Fintype n
i j : n
k : ℕ
x : R
⊢ single i j 1 ⊗ₜ[R] (monomial k) x = ↑includeLeft (single i j x) * 1 ⊗ₜ[R] (X ^ k)

Tactic:
← smul_X_eq_monomial,

Goal state after:
R : Type u_1
inst✝² : CommSemiring R
n : Type w
inst✝¹ : DecidableEq n
inst✝ : Fintype n
i j : n
k : ℕ
x : R
⊢ single i j 1 ⊗ₜ[R] (x • X ^ k) = ↑includeLeft (single i j x) * 1 ⊗ₜ[R] (X ^ k)
Module: Mathlib.LinearAlgebra.Matrix.Charpoly.Basic

Goal state before:
pp: R : Type u_1
S : Type u_2
inst✝³ : CommRing R
inst✝² : CommRing S
n : Type u_4
inst✝¹ : DecidableEq n
inst✝ : Fintype n
M : Matrix n n R
f : R →+* S
⊢ (M.map ⇑f).charmatrix = M.charmatrix.map (Polynomial.map f)

Tactic:
ext i j

Goal state after:
R : Type u_1
S : Type u_2
inst✝³ : CommRing R
inst✝² : CommRing S
n : Type u_4
inst✝¹ : DecidableEq n
inst✝ : Fintype n
M : Matrix n n R
f : R →+* S
i j : n
n✝ : ℕ
⊢ ((M.map ⇑f).charmatrix i j).coeff n✝ = (M.charmatrix.map (Polynomial.map f) i j).coeff n✝