D.12.4.1 ishyper

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.

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