no goals
R : Type u
inst✝¹ : CommMonoid R
R' : Type v
inst✝ : CommMonoidWithZero R'
a : Rˣ
⊢ ↑1 ↑a = 1
classical exact dif_pos a.isUnit
no goals
R : Type u
inst✝¹ : CommMonoid R
R' : Type v
inst✝ : CommMonoidWithZero R'
a : Rˣ
⊢ ↑1 ↑a = 1
exact dif_pos a.isUnit