8 lines
282 B
Text
8 lines
282 B
Text
Set: pp::colors
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Set: pp::unicode
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Set: lean::pp::implicit
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Set: pp::colors
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Assumed: N
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λ (a : N) (f : N → N) (H : f a == a),
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let calc1 : f a == a := @substp N (f a) a (λ x : N, f a == x) (@refl N (f a)) H in calc1 :
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∀ (a : N) (f : N → N), f a == a → f a == a
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