Faster class group computations using norm relations
Examples : multiquadratic fields
Degree 64 :
? pol = multiquad([-1,2,3,5,7,11]);
? abbnf = abelianbnfinit(pol);
cpu time = 1min, 4,345 ms.
? getcyc(abbnf)
% = [96, 48, 16, 16, 16, 8, 8, 4, 4, 2, ...]
? \\bnf = bnfinit(pol); \\very long...