I would like to have a set of equations, all under the same number, but with a "main" equation, and some other equations that follow being labelled with subnumbers, for example

1 = 1 (1)

1 < 2 (1a)

1 > 0 (1b)

How can I achieve this?


1 Answer 1


Use \tag for getting the main number:



First some separate equations
1=1 \tag{\ref{first:main}}
and another
1>0 \label{first:a}
and another
1<2 \label{first:b}

But it works also with \texttt{align} and the other alignment
1 &= 1 \tag{\ref{second:main}}\\
1 &> 0 \label{second:a}\\
1 &< 2 \label{second:b}
and you can reference all of them, as seen below.

Here are some references: \eqref{first:main}, \eqref{first:a}
and \eqref{second:b}.


enter image description here

  • Thank you. I had seen the tag command but could not use it properly - I see here in this case you are passing it a reference to the label for the entire subequation structure. Jan 29, 2015 at 14:49
  • 4
    If you are using the hyperref environment, the solution should be modified to \tag{\ref*{first:main}} to avoid the label to show up as a possibly colored hyperlink.
    – jjdb
    Mar 26, 2015 at 10:17

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