Faster class group computations using norm relations
Examples : multiquadratic fields
Degree 16 :
? pol = multiquad([-1,2,3,5]);
? abbnf = abelianbnfinit(pol);
cpu time = 1,258 ms.
? getcyc(abbnf)
% = [2]
? bnf = bnfinit(pol);
cpu time = 66 ms.
? bnf.cyc
% = [2]