intro
| .inr rfl => exact Quasiorder.co_refl x
| .inl hxy => exact Asymmetric.asymm hxy
case mpr
α : Sort u_1
r : α → α → Prop
self : LinearOrder r
inst✝¹ : StableEq α
inst✝ : ComplementedRel r
x y : α
⊢ reflRel r x y → coRel r x y
no goals