### 4.2 Supported Environments

We can process all standard inline and single display style equation environments like
 $…$ \begin{displaymath} $$\begin{equation} $$…$$ … … … $…$ \end{displaymath}$$ \end{equation}

However, to let the Living Reviews popup equation referencing system work properly we cannot permit the following environments:

 \begin{subequations} \begin{eqaligntwo} … … \end{subequations} \end{eqaligntwo}

It is not allowed to use the \label command inside of an eqnarray* or an equation* environment (i.e. in the versions of the respective environments which suppress equation numbers). When such a label is referenced, this will lead to inserting wrong reference marks in the print as well as the onscreen versions of the article.