fact: Definition npolyp : {poly R} -> {poly_n R} := locked_with npolyp_key (mk_npoly \o (nth 0)).
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)