proposition: Lemma nth_npolyX (i : 'I_n) : npolyX`_i = 'nX^i.
proof: Proof. by rewrite -tnth_nth. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat seq choice fintype tuple) mathcomp(bigop binomial finset finfun ssralg countalg finalg poly polydiv) mathcomp(perm fingroup matrix mxalgebra mxpoly vector countalg)