5 lines
196 B
Text
5 lines
196 B
Text
definition symm {A : Type} : Π {a b : A}, a = b → b = a
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| a a (eq.refl a) := 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 (eq.refl a) (eq.refl a) := rfl
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