3 lines
277 B
Text
3 lines
277 B
Text
quot.sound : ∀ {α : Type u} {r : α → α → Prop} {a b : α}, r a b → quot.mk r a = quot.mk r b
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classical.strong_indefinite_description : Π {a : Sort u} (p : a → Prop), nonempty a → {x // (∃ (y : a), p y) → p x}
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propext : ∀ {a b : Prop}, (a ↔ b) → a = b
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