ation $$\begin{gathered} {  \begingroup   \begingroup\lccode`~=`,     \lowercase{\endgroup\def~}{\pFcomma\mkern\pFqskip}  \mathcode`,=\string"0000   {}_{}F_{0}\biggl(\genfrac..{0pt}{}{{{\alpha}}; \beta _0, \beta _0}{{{\gamma}}};x,y\biggr)  \endgroup }