We consider the R-matrix presentations of the quantum queer superalgebra Uq(qn) and its affine counterpart Uq(q̂n). We derive crossing symmetry relations for the R-matrices and use them to construct central elements in both superalgebras. We also produce an epimorphism ev:Uq(q̂n)→Uq(qn) identical on the subalgebra isomorphic to Uq(qn).
Liu et al. (Wed,) studied this question.