19 lines
372 B
Text
19 lines
372 B
Text
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namespace tst
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variable {A : Type}
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attribute [reducible]
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definition foo₁ (a b c : A) (H₁ : a = b) (H₂ : c = b) : a = c :=
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eq.trans H₁ (eq.symm H₂)
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lemma foo₂ (f : A → A → A) (a b c : A) (H₁ : a = b) (H₂ : c = b) : f a = f c :=
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eq.symm H₂ ▸ H₁ ▸ rfl
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#check foo₁
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#check foo₂
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end tst
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#check tst.foo₁
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#check tst.foo₂
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#print tst.foo₁
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