7 lines
No EOL
243 B
Text
7 lines
No EOL
243 B
Text
import macros
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theorem T (A : Type) (p : A -> Bool) (f : A -> A -> A) : forall x y z, p (f x x) → x = y → x = z → p (f y z) :=
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λ x y z, λ (H1 : p (f x x)) (H2 : x = y) (H3 : x = z),
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subst (subst H1 H2) H3
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print environment 1. |