13 lines
393 B
Text
13 lines
393 B
Text
Import int.
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(**
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-- Tactic for trying to prove goal using Reflexivity, Congruence and available assumptions
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congr_tac = Try(unfold_tac("eq")) .. Repeat(OrElse(apply_tac("Refl"), apply_tac("Congr"), assumption_tac()))
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**)
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Theorem T1 (a b : Int) (f : Int -> Int) : a = b -> (f (f a)) = (f (f b)) :=
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fun assumption : a = b,
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show (f (f a)) = (f (f b)) by congr_tac
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Show Environment 1.
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