Theorem: Imo2017P2.good_map_eq_zero_iff (Compfiles/Imo2017P2.lean)

State before:
R : Type u_1
D : Type u_2
inst✝ : DivisionRing D
f : D → D
h : good f
h0 : f 0 = 1
c : D
h1 : f = 0
⊢ 0 = 1
Tactic:
rwa [h1] at h0
State after:
no goals