Created
October 23, 2024 05:06
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| variable {α : Sort u} (r : α → α → Prop) | |
| inductive EqvClos a : α → Prop | |
| | refl : EqvClos a a | |
| | step : r b c → EqvClos a b → EqvClos a c | |
| | unstep : r b c → EqvClos a c → EqvClos a b | |
| variable {r} | |
| def Quot.exact (h : mk r a = mk r b) : EqvClos r a b := | |
| (h ▸ .refl : (mk r b).lift (EqvClos r a) fun _ _ h => propext ⟨.step h, .unstep h⟩) |
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