9 lines
200 B
Text
9 lines
200 B
Text
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import data.nat
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open nat
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constant f : nat → nat
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theorem tst1 (x y : nat) (H1 : (λ z, z + 0) x = y) (H2 : x = y + 0) (H3 : x = y * 0) : f x = f y :=
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begin
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rewrite [▸ x = y at (H1, H2), H2]
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end
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