fact: Definition trseqmx m n (M : @hseqmx A m n) := if eqn m 0 then nseq n [::] else foldr (zipwith cons) (nseq n [::]) M.
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)