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17 lines
247 B
Idris
17 lines
247 B
Idris
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namespace Hoo
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f : Either a b -> Either b a
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f (Left a) = Right a
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f (Right b) = Left b
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natural : (xs : Either a b) -> ((f . f) . map g) xs === (map g . (f . f)) xs
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natural = ?l
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mutual
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g : h === h
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g = Refl
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h : g === g
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h = Refl
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