9 lines
164 B
Text
9 lines
164 B
Text
exit
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import logic
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theorem tst (A B : Type) (a : A) (b : B) : a == b → b == a :=
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begin
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generalizes [a, b, B],
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intros [B', b, a, H],
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apply (heq.symm H),
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end
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