On combinatorial expansion of the conformal blocks arising from AGT conjecture

V. A. Alba, V. A. Fateev, A. V. Litvinov +1

In their recent paper \cite{Alday:2009aq} Alday, Gaiotto and Tachikawa proposed a relation between $\mathcal{N}=2$ four-dimensional supersymmetric gauge theories and two-dimensiona…