proposition: Fact binary_addv_subproof : mxsum_spec (vs2mx (unwrap S1 + unwrap S2)) (unwrap (addv_dim S1) + unwrap (addv_dim S2)).
proof: Proof. by rewrite vs2mxD; apply: proper_mxsumP. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat seq choice) mathcomp(fintype bigop finfun tuple) mathcomp(ssralg matrix mxalgebra zmodp)