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D.5.2.8 sum_of_powers

Procedure from library chern.lib (see chern_lib).

Usage:
sum_of_powers(k, l); k non-negative integer, l list of polynomials

Return:
polynomial

Purpose:
computes the sum of k-th powers of the entries of l

Note:
returns 0 if k is negative

Example:
 
LIB "chern.lib";
ring r = 0, (x, y, z), dp;
list l=x, y, z;
//sum of 7-th powers of x, y, z
print( sum_of_powers(7, l) );
==> x7+y7+z7