6 lines
186 B
Text
6 lines
186 B
Text
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Set: pp::colors
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Set: pp::unicode
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Proved: T1
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Theorem T1 (a b : ℤ) (f : ℤ → ℤ) (assumption : a = b) : (f (f a)) = (f (f b)) :=
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Congr (Refl f) (Congr (Refl f) assumption)
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