Analogs of q-Serre relations in the Yang-Baxter algebras

Yang-Baxter bialgebras, as previously introduced by the authors, are shown to arise from a double crossproduct construction applied to the bialgebra R₁₂T₁T₂ = T₂T₁R₁₂, E₁T₂ = T₂E₁R₁₂, (T)=TT, (E)=ET + 1E and its skew dual, with R being a numerical matrix solution of the Yang-Baxter equation. It is further shown that a set of relations generalizing q-Serre ones in the Drinfeld-Jimbo algebras U_q(g) can be naturally imposed on Yang-Baxter algebras from the requirement of non-degeneracy of the pairing.