8 lines
218 B
Text
8 lines
218 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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class subsingleton
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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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