fact: Definition fdist_nth : R.-fdist A := fdistmap (fun v : 'rV[A]_n => v ``_ i) P.
imports: mathcomp(all_ssreflect ssralg fingroup perm matrix) mathcomp(all_algebra vector reals normedtype) mathcomp(mathcomp_extra boolp) mathcomp(Rstruct) ssrR logb realType_ext ssr_ext ssralg_ext bigop_ext