8 lines
233 B
Text
8 lines
233 B
Text
import logic
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namespace foo
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definition subsingleton (A : Type) := ∀⦃a b : A⦄, a = b
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attribute subsingleton [class]
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protected definition prop.subsingleton [instance] (P : Prop) : subsingleton P :=
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λa b, proof_irrel _ _
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end foo
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