fact: Definition fdist_take (i : 'I_n.+1) : R.-fdist 'rV[A]_i := fdistmap (row_take 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