exact lt_irrefl d <| hi.trans_le <| (of_fraction_le d s t i).trans hle
case intro.intro.intro.intro.intro.intro
d : ℕ
inst✝ : NeZero d
a b s t : ℕ
hle : s + t ≤ d
hdom : of_fraction d s t ≤ of_fraction d a b
i : Fin (Nat.succ 2)
hab : of_fraction d s t = of_fraction d a b
hi : d < of_fraction d s t i
⊢ False
no goals