fact: Definition big_num := 500%nat.
imports: mathcomp(ssreflect ssrbool ssrfun eqtype ssrnat seq choice fintype order) mathcomp(div finfun bigop prime binomial ssralg finset fingroup finalg) mathcomp(mxalgebra perm zmodp matrix ssrint) mathcomp(seq rat) pol square_free casteljau desc mathcomp(ssrnum ssrint realalg poly) poly_normal