Theorem: ℤθ.my_one_mul (Mordell4/CubicRing.lean)

State before:
a b c : ℤθ
⊢ mul one a = a
Tactic:
cases a
State after:
case mk
b c : ℤθ
f✝ g✝ h✝ : ℤ
⊢ mul one { f := f✝, g := g✝, h := h✝ } = { f := f✝, g := g✝, h := h✝ }

State before:
case mk
b c : ℤθ
f✝ g✝ h✝ : ℤ
⊢ mul one { f := f✝, g := g✝, h := h✝ } = { f := f✝, g := g✝, h := h✝ }
Tactic:
simp [mul, one]
State after:
no goals