9-13-1.tex

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% 9-13-1.tex
\documentclass{article}
\usepackage{amsmath}
\begin{document}
\[
   a_0 + \cfrac{1}{a_1 + \cfrac{1}{a_2 +
         \cfrac{1}{a_3 + \cfrac{1}{a_4}}}}
\]

\[ \binom{n+1}{k} \]

\renewcommand{\atop}[2]{\genfrac{}{}{0pt}{}{#1}{#2}}
\begin{equation}
\sum_{\atop{k_0,k_1,\ldots>0}{k_0+k_1+\cdots=n}} F(k_i)
\end{equation}
\end{document}