case refl
α : Sort u_1
⊢ Bijective (cast (_ : α = α))
α β : Sort u_1
h : α = β
⊢ Bijective (cast h)
cases h
no goals
case refl
α : Sort u_1
⊢ Bijective (cast (_ : α = α))
refine ⟨fun _ _ ↦ id, fun x ↦ ⟨x, rfl⟩⟩