. exact ulp_pos n _
case h₀
x n : ℕ
xpos : 0 < x
hfx : trunc n x = x
⊢ 0 < ulp n (x - 1)

case h₂
x n : ℕ
xpos : 0 < x
hfx : trunc n x = x
⊢ 0 < x

case h₁
x n : ℕ
xpos : 0 < x
hfx : trunc n x = x
⊢ ulp n (x - 1) ∣ x
case h₂
x n : ℕ
xpos : 0 < x
hfx : trunc n x = x
⊢ 0 < x

case h₁
x n : ℕ
xpos : 0 < x
hfx : trunc n x = x
⊢ ulp n (x - 1) ∣ x