6 lines
166 B
Text
6 lines
166 B
Text
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) : f x = f y :=
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by rewrite [▸* at H1, nat.add_zero at H1, H1]
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