$$\frac{1}{\psi }\raisebox{1ex}{$1$}\!\left/ \!\raisebox{-1ex}{$2$}\right.\genfrac{}{}{0px}{}{4}{5}$$ $$\genfrac{}{}{3px}{}{m\hfill }{\psi +2}\frac{1}{\psi +2}$$ $$\genfrac{}{}{2px}{}{\raisebox{1ex}{$1$}\!\left/ \!\raisebox{-1ex}{$x$}\right.+\raisebox{1ex}{$2$}\!\left/ \!\raisebox{-1ex}{$x$}\right.+\dots \hfill }{x^2+x^4+\dots \hfill }$$

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