fact: Definition Vandermonde (R : ringType) (m n : nat) (a : 'rV[R]_n) := \matrix_(i < m, j < n) a 0 j ^+ i.
imports: HB(structures) mathcomp(ssreflect ssrbool ssrfun eqtype ssrnat seq choice) mathcomp(fintype finfun bigop finset fingroup perm order) mathcomp(div prime binomial ssralg countalg finalg zmodp)