Many of users do not use powerful Maxima computer algebra system for systematic work, but for ad hoc algebraic calculations – equations, functions, matrixes, etc. only.
To do this job, it is not useful to download the whole application from a web site.
Function: somrac (<L>, <k>) The list <L> contains elementary symmetric functions of a polynomial <P> . The function computes the polynomial whose roots are the <k> by <k> distinct sums of the roots of <P>.