KASH3 Ref - IsInvertible

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| ### Function IsInvertible ( elt-rng x ) -> elt-alg^boo, elt-rng ### Optional Arguments
Results | elt-ord^rat |  | 1 <= Results <= 2
### Description Return whether the ring element x is invertible; if so, return also the inverse of x. ### Examples IsInvertible(2); IsInvertible(-1); IsInvertible(Element(Q,2)); IsInvertible(Element(Q,-1));
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