Function: nfeltmul
Section: number_fields
C-Name: nfmul
Prototype: GGG
Help: nfeltmul(nf,x,y): element x.y in nf.
Doc:
 given two elements $x$ and $y$ in
 \var{nf}, computes their product $x*y$ in the number field $\var{nf}$.
