if (depth == 1 && x.size() == 2 && !need_trafo)
return - Li_projection(2, y/x[1], cln::float_format(Digits));
// do acceleration transformation (hoelder convolution [BBB])
if (depth == 1 && x.size() == 2 && !need_trafo)
return - Li_projection(2, y/x[1], cln::float_format(Digits));
// do acceleration transformation (hoelder convolution [BBB])