| #### D.12.3.1 ishyper Procedure from library `hyperel.lib` (see hyperel_lib). Usage: ishyper(h,f); h,f=poly Return: 1 if y^2+h(x)y=f(x) is hyperelliptic, 0 otherwise Note: Tests, if y^2+h(x)y=f(x) is a hyperelliptic curve. Curve is defined over basering. Additionally shows error-messages. Example:
    LIB "hyperel.lib";
    ring R=7,x,dp;
    // hyperelliptic curve y^2 + h*y = f
    poly h=x;
    poly f=x5+5x4+6x2+x+3;
    ishyper(h,f);
    ==> 1

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