exact a₁_lo_of_lt_round npos hfaithful₁ lt_round
case inr.inl.left
round : ℕ → ℕ
n a b : ℕ
npos : 0 < n
hfaithful₀ : faithful₀ n round
hfaithful₁ : faithful₁ n round
hcorrect₁ : correct₁ n round
hfa : trunc n a = a
hfb : trunc n b = b
hba : b ≤ a
no_uflow : a + b ≥ 2 ^ n
lt_round : a + b < round (a + b)
⊢ trunc n (a + b - round (a + b)) = a + b - round (a + b)
no goals