have : NeZero (ringChar R) := ⟨h⟩
R : Type u_1
inst✝¹ : CommRing R
inst✝ : IsDomain R
a b : R
h : ringChar R ≠ 0
⊢ (a + b) ^ ringChar R = a ^ ringChar R + b ^ ringChar R
R : Type u_1
inst✝¹ : CommRing R
inst✝ : IsDomain R
a b : R
h : ringChar R ≠ 0
this : NeZero (ringChar R)
⊢ (a + b) ^ ringChar R = a ^ ringChar R + b ^ ringChar R