fact: Definition ord_enum_eq n : seq 'I_n := pmap (insub_eq _) (iota 0 n).
imports: mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat div seq ssralg) mathcomp(path choice fintype tuple finset bigop poly matrix mxpoly) CoqEAL(hrel param refinements trivial_seq)