3 lines
202 B
Text
3 lines
202 B
Text
quot.sound : ∀ {A} [s] {a b}, setoid.r a b → quot.mk a = quot.mk b
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classical.strong_indefinite_description : Π {A} P, nonempty A → {x | Exists P → P x}
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propext : ∀ {a b}, (a ↔ b) → a = b
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