2015-07-28 17:14:51 -07:00
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quot.sound : ∀ {A : Type} [s : setoid A] {a b : A}, setoid.r a b → quot.mk a = quot.mk b
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2015-08-12 18:37:33 -07:00
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classical.strong_indefinite_description : Π {A : Type} (P : A → Prop), nonempty A → {x : A | Exists P → P x}
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2015-07-28 17:14:51 -07:00
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propext : ∀ {a b : Prop}, (a ↔ b) → a = b
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