Missing $ inserted with \left and \right

Question

Hello everybody I am a new Latex user and I try to write a my first presentation starting from a templete. When I try to make a slide with this code

\subsection{Main Result}
\frame
{
\begin{block}{Theorem \left[ Pasquale, Nicola \right]}
Consider the multiplex network .... code from daniel
\end{block}
}

I have this error

Missing $ inserted.}

Thanks a lot for every answer

Answer 1

The best way is to not use \left and \right:

\documentclass{beamer}
\begin{document}

\frame
{
\begin{block}{Theorem [Pasquale, Nicola]}
Consider the multiplex network .... code from daniel
\end{block}
}
\end{document}

However if you want to use \left and \right you should be in math mode but this is not the best solution at all:

\documentclass{beamer}
\begin{document}

\frame
{
\begin{block}{Theorem $\left[\text{Pasquale, Nicola} \right]$}
Consider the multiplex network .... code from daniel
\end{block}
}
\end{document}