simp [this]
f : Bool → Bool → Bool
f_stable : f false false = false
m : Nat
hm : ¬m = 0
hftf : f true false = true
this : ∀ (b : Bool), f b false = b
⊢ (if true = true then m % 2 else 0) = if f (decide (m % 2 = 1)) false = true then 1 else 0
f : Bool → Bool → Bool
f_stable : f false false = false
m : Nat
hm : ¬m = 0
hftf : f true false = true
this : ∀ (b : Bool), f b false = b
⊢ m % 2 = if m % 2 = 1 then 1 else 0