Theorem: SkewPolynomial.ofFinsupp_eq_zero (SkewPolynomials.lean)

State before:
R : Type u
a✝ b : R
m n : ℕ
inst✝ : Semiring R
φ : R →+* R
p q : R[X;φ]
a : AddMonoidAlgebra R ℕ
⊢ { toFinsupp := a } = 0 ↔ a = 0
Tactic:
rw [← ofFinsupp_zero, ofFinsupp_inj]
State after:
no goals