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Def R^-1(x,y) == y R x

is mentioned by

Thm* R:(TTProp), x,y:T. (x R^*^-1 y (x (R^-1^*) y)[rel_inverse_star]
Thm* R:(TTProp), n:x,y:T. (x R^n^-1 y (x R^-1^n y)[rel_inverse_exp]

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mb nat Sections MarkB generic Doc