Theorem: DirectSum.mul_one
File: Mathlib/Algebra/DirectSum/Ring.lean

tactic: suffices (mulHom A).flip One.one = AddMonoidHom.id (⨁ i, A i) from DFunLike.congr_fun this x
state_before: ι : Type u_1
inst✝³ : DecidableEq ι
A : ι → Type u_2
inst✝² : (i : ι) → AddCommMonoid (A i)
inst✝¹ : AddMonoid ι
inst✝ : GSemiring A
x : ⨁ (i : ι), A i
⊢ x * 1 = x
state_after: ι : Type u_1
inst✝³ : DecidableEq ι
A : ι → Type u_2
inst✝² : (i : ι) → AddCommMonoid (A i)
inst✝¹ : AddMonoid ι
inst✝ : GSemiring A
x : ⨁ (i : ι), A i
⊢ (mulHom A).flip One.one = AddMonoidHom.id (⨁ (i : ι), A i)

tactic: apply addHom_ext
state_before: ι : Type u_1
inst✝³ : DecidableEq ι
A : ι → Type u_2
inst✝² : (i : ι) → AddCommMonoid (A i)
inst✝¹ : AddMonoid ι
inst✝ : GSemiring A
x : ⨁ (i : ι), A i
⊢ (mulHom A).flip One.one = AddMonoidHom.id (⨁ (i : ι), A i)
state_after: case H
ι : Type u_1
inst✝³ : DecidableEq ι
A : ι → Type u_2
inst✝² : (i : ι) → AddCommMonoid (A i)
inst✝¹ : AddMonoid ι
inst✝ : GSemiring A
x : ⨁ (i : ι), A i
⊢ ∀ (i : ι) (y : A i), ((mulHom A).flip One.one) ((of A i) y) = (AddMonoidHom.id (⨁ (i : ι), A i)) ((of A i) y)

tactic: intro i xi
state_before: case H
ι : Type u_1
inst✝³ : DecidableEq ι
A : ι → Type u_2
inst✝² : (i : ι) → AddCommMonoid (A i)
inst✝¹ : AddMonoid ι
inst✝ : GSemiring A
x : ⨁ (i : ι), A i
⊢ ∀ (i : ι) (y : A i), ((mulHom A).flip One.one) ((of A i) y) = (AddMonoidHom.id (⨁ (i : ι), A i)) ((of A i) y)
state_after: case H
ι : Type u_1
inst✝³ : DecidableEq ι
A : ι → Type u_2
inst✝² : (i : ι) → AddCommMonoid (A i)
inst✝¹ : AddMonoid ι
inst✝ : GSemiring A
x : ⨁ (i : ι), A i
i : ι
xi : A i
⊢ ((mulHom A).flip One.one) ((of A i) xi) = (AddMonoidHom.id (⨁ (i : ι), A i)) ((of A i) xi)

tactic: simp only [One.one]
state_before: case H
ι : Type u_1
inst✝³ : DecidableEq ι
A : ι → Type u_2
inst✝² : (i : ι) → AddCommMonoid (A i)
inst✝¹ : AddMonoid ι
inst✝ : GSemiring A
x : ⨁ (i : ι), A i
i : ι
xi : A i
⊢ ((mulHom A).flip One.one) ((of A i) xi) = (AddMonoidHom.id (⨁ (i : ι), A i)) ((of A i) xi)
state_after: case H
ι : Type u_1
inst✝³ : DecidableEq ι
A : ι → Type u_2
inst✝² : (i : ι) → AddCommMonoid (A i)
inst✝¹ : AddMonoid ι
inst✝ : GSemiring A
x : ⨁ (i : ι), A i
i : ι
xi : A i
⊢ ((mulHom A).flip ((of A 0) GradedMonoid.GOne.one)) ((of A i) xi) = (AddMonoidHom.id (⨁ (i : ι), A i)) ((of A i) xi)

tactic: rw [flip_apply, mulHom_of_of]
state_before: case H
ι : Type u_1
inst✝³ : DecidableEq ι
A : ι → Type u_2
inst✝² : (i : ι) → AddCommMonoid (A i)
inst✝¹ : AddMonoid ι
inst✝ : GSemiring A
x : ⨁ (i : ι), A i
i : ι
xi : A i
⊢ ((mulHom A).flip ((of A 0) GradedMonoid.GOne.one)) ((of A i) xi) = (AddMonoidHom.id (⨁ (i : ι), A i)) ((of A i) xi)
state_after: case H
ι : Type u_1
inst✝³ : DecidableEq ι
A : ι → Type u_2
inst✝² : (i : ι) → AddCommMonoid (A i)
inst✝¹ : AddMonoid ι
inst✝ : GSemiring A
x : ⨁ (i : ι), A i
i : ι
xi : A i
⊢ (of A (i + 0)) (GradedMonoid.GMul.mul xi GradedMonoid.GOne.one) = (AddMonoidHom.id (⨁ (i : ι), A i)) ((of A i) xi)

tactic: exact of_eq_of_gradedMonoid_eq (mul_one <| GradedMonoid.mk i xi)
state_before: case H
ι : Type u_1
inst✝³ : DecidableEq ι
A : ι → Type u_2
inst✝² : (i : ι) → AddCommMonoid (A i)
inst✝¹ : AddMonoid ι
inst✝ : GSemiring A
x : ⨁ (i : ι), A i
i : ι
xi : A i
⊢ (of A (i + 0)) (GradedMonoid.GMul.mul xi GradedMonoid.GOne.one) = (AddMonoidHom.id (⨁ (i : ι), A i)) ((of A i) xi)
state_after: no goals