Canonical v2r_linear := Linear (s2valP v2r_subproof : linear v2r).Canonical r2v_linear := Linear (can2_linear v2rK r2vK).Definition mx2vs {m} A : {vspace vT} := Space _ (@mx2vs_subproof m A).

(* Specifications: *)
Lemma vs2mxK : cancel vs2mx mx2vs.