fact: Fixpoint store_seqmx0 T m i j (v : T) := match m, i with | [::], _ => [::] | h :: t, O => store_aux h j v :: t | h :: t, S i => h :: store_seqmx0 t i j v end.
imports: mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat seq) mathcomp(choice fintype bigop matrix) CoqEAL(hrel param refinements seqmx seqpoly)