| #### D.12.3.4 norm Procedure from library `hyperel.lib` (see hyperel_lib). Usage: norm(a,b,h,f); Return: norm of a(x)-b(x)y in IF[C] Note: The norm is a polynomial in just one variable. Curve C: y^2+h(x)y=f(x) is defined over basering. 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;
    poly a=x2+1;
    poly b=x;
    norm(a,b,h,f);
    ==> -x7+2x6+3x4-x3+1

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