2 lines
81 B
Text
2 lines
81 B
Text
theorem symm2 {A : Type} {a b : A} (H : a = b) : b = a
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:= eq.subst H (eq.refl a)
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theorem symm2 {A : Type} {a b : A} (H : a = b) : b = a
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:= eq.subst H (eq.refl a)
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