3 lines
208 B
Text
3 lines
208 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.choice : Π {α : Sort u}, nonempty α → α
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propext : ∀ {a b : Prop}, (a ↔ b) → a = b
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