exact ⟨trunc_zero n, trunc_zero n⟩
round : ℕ → ℕ
n a b : ℕ
npos : 0 < n
hfaithful₀ : faithful₀ n round
uflow : a + b < 2 ^ n
k : trunc n (a + b) = a + b
l : round (a + b) = a + b
⊢ trunc n 0 = 0 ∧ trunc n 0 = 0
no goals