exact a₁' npos hfaithful₀ hfaithful₁ hcorrect₁ hfb hfa hab
case inl
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
hab : a ≤ b
⊢ trunc n (b + a - round (b + a)) = b + a - round (b + a) ∧ trunc n (round (b + a) - (b + a)) = round (b + a) - (b + a)
no goals