8 lines
172 B
Text
8 lines
172 B
Text
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import logic data.sigma data.list
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open sigma
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check ∃ (A : Type₁) (x y : A), x = y
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check ∃ (x : num), x = 0
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check Σ (x : num), x = 10
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check Σ (A : Type₁), list A
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