21 lines
480 B
Text
21 lines
480 B
Text
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import data.set
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open set
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section
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variable {A : Type}
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definition set_of (P : A → Prop) : set A := P
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notation `{` binders `|` r:(scoped:1 P, set_of P) `}` := r
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definition insert (a : A) (s : set A) : set A := {x : A | x = a ∨ x ∈ s}
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notation `⦃` s:(foldr `,` (a t, insert a t) ∅) `⦄` := s
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notation `{` `{` s:(foldr `,` (a t, insert a t) ∅) `}` `}` := s
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check ⦃1, 2, 3⦄
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check {{1, 2, 3}}
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definition foo {X : Type} {{ x : X }} : X := x
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end
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