# Footnote is creating a page break

I'm using beamer and used footnote, however it would introduce a page break, note that change the size of my beamer didn't help.

 \documentclass[aspectratio=169,xcolor=table]{beamer}
\begin{document}
\begin{itemize}
\item Solve $x^2y''-2xy'+2y=2x^3\textrm{e}^x$
\begin{itemize}
\item $y_1=x^2, y_2=x, r(x)=2x\textrm{e}^x$
\item W\footnote{ $y_p=-y_1\int \dfrac{y_2r(x)}{W}\, dx+ y_2 ont\dfrac{y_1r(x)}{W}$}
\end{itemize}
\end{itemize}
\end{frame}
\end{document}

• For the equation in the footnote, change \dfrac to \frac. Commented Oct 18, 2020 at 10:31
• Off-topic: You should replace all instances of \textrm{e} with \mathsf{e}.
– Mico
Commented Oct 18, 2020 at 10:55
• Just out of curiosity: What does "ont" denote?
– Mico
Commented Oct 18, 2020 at 10:58

Some suggestions/observations:

• Use inline-fraction notation in the footnote instead of \dfrac or \frac

• Use \mathsf{e} rather than \mathrm{e} to denote \exp(1)

• Write the material in the first level-2 item as three separate formulas

As a (welcome) side-effect of these changes, the spurious page break will disappear on its own.

...

\documentclass[aspectratio=169,xcolor=table]{beamer}
\begin{document}
\begin{itemize}
\item Solve $x^2y''-2xy'+2y=2x^3\mathsf{e}^x$
\begin{itemize}
\item $y_1=x^2$, $y_2=x$, $r(x)=2x\mathsf{e}^x$
\item W\footnote{$y_p=-y_1\int\! y_2r(x)/W\, dx+ y_2 ont\, y_1r(x)/W$}
\end{itemize}
\end{itemize}
\end{frame}
\end{document}


The size of the equation is too big, it flows out of the footnote area and causes a new page to be generated.

The easiest way to fix this is to use \frac instead of \dfrac

MWE:

 \documentclass[]{beamer}

\begin{document}

\item Solve $x^2y''-2xy'+2y=2x^3\textrm{e}^x$
\item $y_1=x^2, y_2=x, r(x)=2x\textrm{e}^x$
\item W\footnote{$y_p=-y_1\int \frac{y_2r(x)}{W}\, dx+ y_2 ont\frac{y_1r(x)}{W}$}