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I'm having some problems with this error and I don't know what to do. I have to use a certain template and it doesn't work anymore. Before it used to.

\documentclass[sn-mathphys]{sn-jnl}
\begin{document}
\begin{equation*}
\left.
  \begin{array}{l}
  \left.
  \begin{array}{l}
  \displaystyle{\vec{u}_{h,N}^{m}, \vec{u}_{h,N}^{m-1} \in W_{h}^{s}}\\
  W_{h}^{s}\,\,\mbox{vectorial space}
  \end{array}\right|
  \Rightarrow \displaystyle{\frac{\vec{u}_{h,N}^{m} - \vec{u}_{h,N}^{m-1}}{\tau/N} \in W_{h}^{s}}\\
  \left.
  \begin{array}{l}
  \displaystyle{\vec{\omega}_{h,N}^{m} \in {\cal W}_{h}}\\
  \displaystyle{\vec{\omega}_{h,N}^{m} = \vec{\omega}_{h,N}^{m}\vert_{\Omega_{s}}}
  \end{array}\right|
  \Rightarrow \vec{\omega}_{h,N}^{m} \in W_{h}^{s}\\
  \end{array}\right|
  \Rightarrow \vec{\theta}_{h,N}^{m} \in W_{h}^{s}
\end{equation*}
\end{document}
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2
  • Welcome to TSE. Please post a Minimal Working Example, instead of a code snippet. Commented Jul 24, 2022 at 8:16
  • As I don't have you class installed, I replaced it with the report class and loaded amsmath. There was no problem with the compilation. Commented Jul 24, 2022 at 8:55

1 Answer 1

Reset to default
1

For very mysterious reasons the class loads the program package that serves essentially no purpose.

This has the nasty effect that | cannot be used as a delimiter.

Use \right\rvert instead.

On the other hand, you can improve your output.

\documentclass[sn-mathphys]{sn-jnl}

\begin{document}

\begin{equation*}
% outer block
\left.
\begin{aligned}
  % top block
& \left.
  \begin{aligned}
    &\vec{u}_{h,N}^{\,m}, \vec{u}_{h,N}^{\,m-1} \in W_{h}^{s}
    \\
    &W_{h}^{s}\text{ vector space}
  \end{aligned}
  \right\rvert
  \Rightarrow
  \frac{\vec{u}_{h,N}^{\,m} - \vec{u}_{h,N}^{\,m-1}}{\tau/N} \in W_{h}^{s}
\\
  % bottom block
& \left.
  \begin{aligned}
    &\vec{\omega}_{h,N}^{\,m} \in \mathcal{W}_{h}\\
    &\vec{\omega}_{h,N}^{\,m} = \vec{\omega}_{h,N}^{\,m}\vert_{\Omega_{s}}
  \end{aligned}
  \right\rvert
  \Rightarrow
  \vec{\omega}_{h,N}^{\,m} \in W_{h}^{s}
\end{aligned}
\right\rvert
\Rightarrow
\vec{\theta}_{h,N}^{\,m} \in W_{h}^{s}
\end{equation*}

\end{document}

enter image description here

Train yourself to use \, in the exponents to \vec{}

Also, the standard name in English is vector space (not vectorial); this is a common error for speakers of Italian or French.

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