When using a special TeX command in titles or captions, these will be used by hyperref, and they must then be prevented to expand wrongly if they are not robust commands by using protect in front of them.
For example, given \newcommand{\GJ}{\mathcal{J}} if we want to set into a title \section{The $\GJ$ relation}, we need to write instead \section{The $\protect\GJ$ relation}.
When using a special TeX command in titles or captions, these will be used by hyperref, and they must then be prevented to expand wrongly if they are not robust commands by using `protect` in front of them.
For example, given `\newcommand{\GJ}{\mathcal{J}}` if we want to set into a title `\section{The $\GJ$ relation}`, we need to write instead `\section{The $\protect\GJ$ relation}`.
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When using a special TeX command in titles or captions, these will be used by hyperref, and they must then be prevented to expand wrongly if they are not robust commands by using
protectin front of them.For example, given
\newcommand{\GJ}{\mathcal{J}}if we want to set into a title\section{The $\GJ$ relation}, we need to write instead\section{The $\protect\GJ$ relation}.Use of protectto Doc: Use of protect