exact ulp_sub_le_of_no_uflow_of_no_carry_of_lt_round npos hfaithful₁ hcorrect₁
  hfa no_uflow no_carry lt_round
n a b : ℕ
npos : 0 < n
round : ℕ → ℕ
hfaithful₁ : faithful₁ n round
hcorrect₁ : correct₁ n round
hfa : trunc n a = a
hfb : trunc n b = b
hba : b ≤ a
no_uflow : 2 ^ n ≤ a + b
no_carry : a + b < 2 ^ Nat.size a
lt_round : a + b < round (a + b)
⊢ ulp n (a + b) - (a + b) % ulp n (a + b) ≤ b
no goals