2014-08-25 02:58:48 +00:00
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import logic
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2014-09-03 23:00:38 +00:00
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open bool
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2014-07-23 15:22:53 +00:00
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definition set {{T : Type}} := T → bool
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2014-10-21 22:27:45 +00:00
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infix `∈` := λx A, A x = tt
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2014-07-23 15:22:53 +00:00
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2014-09-03 23:00:38 +00:00
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check 1 ∈ (λ x, tt)
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