KASH3 Ref - IsSquare

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| ### Function IsSquare ( elt-fld^fin x ) -> elt-alg^boo, elt-fld^fin ### Optional Arguments
Results | elt-ord^rat |  | 1 <= Results <= 2
### Description True iff the element x of the the finite field F is the square of an element of F; if true, such an element is also returned. ### Examples x_gf7 := FiniteField(7); IsSquare(One(x_gf7)); IsSquare(Element(x_gf7,2)); x_gf7 := FiniteField(7); IsSquare(-One(x_gf7)); IsSquare(Element(x_gf7,3));
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