Function: rnfpolredabs
Section: number_fields
C-Name: rnfpolredabs
Prototype: GGD0,L,
Help: rnfpolredabs(nf,pol,{flag=0}): given a pol with coefficients in nf,
 finds a relative simpler polynomial defining the same field. Binary digits
 of flag mean: 1: return also the element whose characteristic polynomial is
 the given polynomial, 2: return an absolute polynomial, 16: partial
 reduction

