fact: Variables (A B : finType) (n : nat) (P : R.-fdist ('rV[A]_n.+1 * B)) (i : 'I_n.+1).
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