5 lines
172 B
Text
5 lines
172 B
Text
definition symm {A : Type} : Π {a b : A}, a = b → b = a
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| a a rfl := rfl
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definition trans {A : Type} : Π {a b c : A}, a = b → b = c → a = c
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| a a a rfl rfl := rfl
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