Theorem: CancelCommMonoid.toCommMonoid_injective
File: Mathlib/Algebra/Group/Ext.lean

tactic: rintro @⟨@⟨@⟨⟩⟩⟩ @⟨@⟨@⟨⟩⟩⟩ h
state_before: M : Type u
⊢ Injective (@toCommMonoid M)
state_after: case mk.mk.mk.mk.mk.mk
M : Type u
toOne✝¹ : One M
npow✝¹ : ℕ → M → M
npow_zero✝¹ : ∀ (x : M), npow✝¹ 0 x = 1
toSemigroup✝¹ : Semigroup M
mul_left_cancel✝¹ : ∀ (a b c : M), a * b = a * c → b = c
one_mul✝¹ : ∀ (a : M), 1 * a = a
mul_one✝¹ : ∀ (a : M), a * 1 = a
npow_succ✝¹ : ∀ (n : ℕ) (x : M), npow✝¹ (n + 1) x = npow✝¹ n x * x
mul_comm✝¹ : ∀ (a b : M), a * b = b * a
toOne✝ : One M
npow✝ : ℕ → M → M
npow_zero✝ : ∀ (x : M), npow✝ 0 x = 1
toSemigroup✝ : Semigroup M
mul_left_cancel✝ : ∀ (a b c : M), a * b = a * c → b = c
one_mul✝ : ∀ (a : M), 1 * a = a
mul_one✝ : ∀ (a : M), a * 1 = a
npow_succ✝ : ∀ (n : ℕ) (x : M), npow✝ (n + 1) x = npow✝ n x * x
mul_comm✝ : ∀ (a b : M), a * b = b * a
h : toCommMonoid = toCommMonoid
⊢ mk mul_comm✝¹ = mk mul_comm✝

tactic: congr <;> {
  injection h with h'
  injection h' }
state_before: case mk.mk.mk.mk.mk.mk
M : Type u
toOne✝¹ : One M
npow✝¹ : ℕ → M → M
npow_zero✝¹ : ∀ (x : M), npow✝¹ 0 x = 1
toSemigroup✝¹ : Semigroup M
mul_left_cancel✝¹ : ∀ (a b c : M), a * b = a * c → b = c
one_mul✝¹ : ∀ (a : M), 1 * a = a
mul_one✝¹ : ∀ (a : M), a * 1 = a
npow_succ✝¹ : ∀ (n : ℕ) (x : M), npow✝¹ (n + 1) x = npow✝¹ n x * x
mul_comm✝¹ : ∀ (a b : M), a * b = b * a
toOne✝ : One M
npow✝ : ℕ → M → M
npow_zero✝ : ∀ (x : M), npow✝ 0 x = 1
toSemigroup✝ : Semigroup M
mul_left_cancel✝ : ∀ (a b c : M), a * b = a * c → b = c
one_mul✝ : ∀ (a : M), 1 * a = a
mul_one✝ : ∀ (a : M), a * 1 = a
npow_succ✝ : ∀ (n : ℕ) (x : M), npow✝ (n + 1) x = npow✝ n x * x
mul_comm✝ : ∀ (a b : M), a * b = b * a
h : toCommMonoid = toCommMonoid
⊢ mk mul_comm✝¹ = mk mul_comm✝
state_after: no goals

tactic: injection h with h'
state_before: case mk.mk.mk.mk.mk.mk.e_toLeftCancelMonoid.e_npow
M : Type u
toOne✝¹ : One M
npow✝¹ : ℕ → M → M
npow_zero✝¹ : ∀ (x : M), npow✝¹ 0 x = 1
toSemigroup✝¹ : Semigroup M
mul_left_cancel✝¹ : ∀ (a b c : M), a * b = a * c → b = c
one_mul✝¹ : ∀ (a : M), 1 * a = a
mul_one✝¹ : ∀ (a : M), a * 1 = a
npow_succ✝¹ : ∀ (n : ℕ) (x : M), npow✝¹ (n + 1) x = npow✝¹ n x * x
mul_comm✝¹ : ∀ (a b : M), a * b = b * a
toOne✝ : One M
npow✝ : ℕ → M → M
npow_zero✝ : ∀ (x : M), npow✝ 0 x = 1
toSemigroup✝ : Semigroup M
mul_left_cancel✝ : ∀ (a b c : M), a * b = a * c → b = c
one_mul✝ : ∀ (a : M), 1 * a = a
mul_one✝ : ∀ (a : M), a * 1 = a
npow_succ✝ : ∀ (n : ℕ) (x : M), npow✝ (n + 1) x = npow✝ n x * x
mul_comm✝ : ∀ (a b : M), a * b = b * a
h : toCommMonoid = toCommMonoid
⊢ npow✝¹ = npow✝
state_after: case mk.mk.mk.mk.mk.mk.e_toLeftCancelMonoid.e_npow
M : Type u
toOne✝¹ : One M
npow✝¹ : ℕ → M → M
npow_zero✝¹ : ∀ (x : M), npow✝¹ 0 x = 1
toSemigroup✝¹ : Semigroup M
mul_left_cancel✝¹ : ∀ (a b c : M), a * b = a * c → b = c
one_mul✝¹ : ∀ (a : M), 1 * a = a
mul_one✝¹ : ∀ (a : M), a * 1 = a
npow_succ✝¹ : ∀ (n : ℕ) (x : M), npow✝¹ (n + 1) x = npow✝¹ n x * x
mul_comm✝¹ : ∀ (a b : M), a * b = b * a
toOne✝ : One M
npow✝ : ℕ → M → M
npow_zero✝ : ∀ (x : M), npow✝ 0 x = 1
toSemigroup✝ : Semigroup M
mul_left_cancel✝ : ∀ (a b c : M), a * b = a * c → b = c
one_mul✝ : ∀ (a : M), 1 * a = a
mul_one✝ : ∀ (a : M), a * 1 = a
npow_succ✝ : ∀ (n : ℕ) (x : M), npow✝ (n + 1) x = npow✝ n x * x
mul_comm✝ : ∀ (a b : M), a * b = b * a
h' : Monoid.mk ⋯ ⋯ LeftCancelMonoid.npow ⋯ ⋯ = Monoid.mk ⋯ ⋯ LeftCancelMonoid.npow ⋯ ⋯
⊢ npow✝¹ = npow✝

tactic: injection h'
state_before: case mk.mk.mk.mk.mk.mk.e_toLeftCancelMonoid.e_npow
M : Type u
toOne✝¹ : One M
npow✝¹ : ℕ → M → M
npow_zero✝¹ : ∀ (x : M), npow✝¹ 0 x = 1
toSemigroup✝¹ : Semigroup M
mul_left_cancel✝¹ : ∀ (a b c : M), a * b = a * c → b = c
one_mul✝¹ : ∀ (a : M), 1 * a = a
mul_one✝¹ : ∀ (a : M), a * 1 = a
npow_succ✝¹ : ∀ (n : ℕ) (x : M), npow✝¹ (n + 1) x = npow✝¹ n x * x
mul_comm✝¹ : ∀ (a b : M), a * b = b * a
toOne✝ : One M
npow✝ : ℕ → M → M
npow_zero✝ : ∀ (x : M), npow✝ 0 x = 1
toSemigroup✝ : Semigroup M
mul_left_cancel✝ : ∀ (a b c : M), a * b = a * c → b = c
one_mul✝ : ∀ (a : M), 1 * a = a
mul_one✝ : ∀ (a : M), a * 1 = a
npow_succ✝ : ∀ (n : ℕ) (x : M), npow✝ (n + 1) x = npow✝ n x * x
mul_comm✝ : ∀ (a b : M), a * b = b * a
h' : Monoid.mk ⋯ ⋯ LeftCancelMonoid.npow ⋯ ⋯ = Monoid.mk ⋯ ⋯ LeftCancelMonoid.npow ⋯ ⋯
⊢ npow✝¹ = npow✝
state_after: no goals