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 KASH3 Reference Manual
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Function

IsInvertible ( elt-rng x ) -> elt-alg^boo, elt-rng

Optional Arguments

Resultselt-ord^rat1 <= 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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