To label a single symbol to long equation, we use \begin{split}...\end{split}:

   H=\langle x_1,x_2,\cdots, x_n \colon & [x_i,x_j,x_k]=1,\\
                                              & [x_i,x_j]^p=1 \rangle.

To label an equation by a symbol say (*), we use \tag{ } inside \begin{equation}.


Question: If I want to label a long equation by a single symbol, how to do it?


1 Answer 1


you have very nearly answered your own question.

\begin{equation} ... \end{equation} should be used for display math that consists of a single formula, i.e., has only one equation "number". split can be used within equation, and is recommended (read the documentation, please). so

H=\langle x_1,x_2,\cdots, x_n \colon & [x_i,x_j,x_k]=1,\\
                                          & [x_i,x_j]^p=1 \rangle.

will do exactly what you want.

  • Or aligned. But the main request is to also use something like \tag{<symbol>}.
    – Werner
    Mar 2, 2016 at 2:24
  • sorry, I didn't get your your answer. where we use \tag here?
    – p Groups
    Mar 2, 2016 at 2:25
  • @pGroups -- sorry, not paying proper attention. fixed now. Mar 2, 2016 at 2:30
  • @barbara: Thanks. (Actually, I was checking this by adding \tag{ } at different places inside \begin{equation...\end{equation}, but it was giving errors. Then I thought that there may be some different way for it, hence posted the question above.)
    – p Groups
    Mar 2, 2016 at 3:10

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