. exact b₁_hi_of_round_le npos hfaithful₁ round_lt.le
case inr.inr.inl.inr.inr.right
round : ℕ → ℕ
n a b : ℕ
npos : 0 < n
hfaithful₀ : faithful₀ n round
hfaithful₁ : faithful₁ n round
hcorrect₀ : correct₀ n round
hfa : trunc n a = a
hfb : trunc n b = b
hba : b ≤ a
no_uflow : a - b ≥ 2 ^ n
bpos : b > 0
two_mul_lt : 2 * b < a
round_lt : round (a - b) < a - b
⊢ trunc n (round (a - b) - (a - b)) = round (a - b) - (a - b)
no goals