2014-08-25 02:58:48 +00:00
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import logic
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2014-07-03 16:07:56 +00:00
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using tactic
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variable A : Type.{1}
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variable f : A → A → A
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theorem tst {a b c : A} (H1 : a = b) (H2 : b = c) : f a (f b b) = f b (f c c)
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:= by apply (subst H1);
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trace "trying again... ";
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state;
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apply (subst H2);
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apply refl
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