fact: Definition RseqmxC {m1 m2} (rm : nat_R m1 m2) {n1 n2} (rn : nat_R n1 n2) : 'M[R]_(m1, n1) -> hseqmx m2 n2 -> Type := (Rseqmx rm rn \o (list_R (list_R rAC)))%rel.
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)