Definition Tplus : Map2 T T T.Definition Tzero : T := Build_subtype (Refl a:Pred_fun (single a) a).Definition Tminus : Map T T.Definition Tmult : Map2 F T T.Definition trivvecsp : vectorspace F.Definition triv_basis : basis (trivvecsp a F).

Lemma trivvecsp_has_dim_zero : has_dim 0 (trivvecsp a F).