fact: Definition split_prod (m n : nat) (i : 'I_(m * n)): 'I_m * 'I_n := (Ordinal (split_prodpl i), Ordinal (split_prodpr i)).
imports: HB(structures) mathcomp(all_ssreflect ssralg fingroup perm matrix) mathcomp(mathcomp_extra boolp classical_sets Rstruct) mathcomp(ssrnum ereal) mathcomp(lra Rstruct reals) Reals ssrR Reals_ext Ranalysis_ext ssr_ext ssralg_ext logb realType_ext fdist