An alternative proof of ${\widehat{\mathfrak{sl}}}_2^{\prime }$ standard module semi-infinite structure

Timur Kenzhaev

B. Feigin and A. Stoyanovsky found the basis of semi-infinite monomials in standard ${\widehat{\mathfrak{sl}}}_2^{\prime }$-module $L_{(0,1)}$ with Lefschetz formula for the corresponding fl…