Combinatorial bases of Feigin-Stoyanovsky's type subspaces of level 2 standard modules for $D_4^{(1)}$

Ivana Baranović

Let $\gtl$ be an affine Lie algebra of type $D_{\ell }^{(1)}$ and $L(\Lambda )$ its standard module with a highest weight vector $v_{\Lambda }$. For a given $\mathbb{Z}$-gradation $\gtl = \gtl_{-1} + \gtl_…