11 lines
234 B
Text
11 lines
234 B
Text
Set: pp::colors
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Set: pp::unicode
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Proved: T
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theorem T (A : Type)
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(p : A → Bool)
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(f : A → A → A)
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(x y z : A)
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(H : p (f x x))
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(H::1 : x = y)
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(H::2 : x = z) : p (f y z) :=
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subst (subst H H::1) H::2
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