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I am using TeXstudio with MiKTeX. I am new to LaTeX but have the standard packages like Amsmath.

I would like to have the following numbering scheme for my equations

eq 1
eq 2
eq 3a
eq 3b
eq 3c
eq 4
eq 5

Where I have interrupted the normal sequential counting with 3a, 3b, and 3c, but the sequence resumed with eq 4 afterward. Furthermore, I would like to do this in an automated fashion, i.e. if I go back and insert another equation

eq 1
eq 2
<---insert new equation
eq 3a
eq 3b
eq 3c
eq 4
eq 5

then the numbering scheme will automatically update to

eq 1
eq 2
eq 3
eq 4a
eq 4b
eq 4c
eq 5
eq 6

Is there a way to do this, or a reference I can read about how to do this? Thanks!

Edit solved

as per the comment, I used subequations.

\begin{subequations}[eq:sp]
\begin{align}
equation math \label{eq:spa}\\
equation math \label{eq:spb}\\
equation math \label{eq:spc}
\end{align}
\end{subequations}

worked for me. The "sp" was arbitrary; it seems to be a tag for the remaining subequations.

This post was helpful.

Community
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Blaise
  • 143

1 Answers1

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As per the comment, I used subequations to accomplish what I was looking for.

\begin{subequations} \label{eq:sp}
\begin{align}
{}& equation math \label{eq:spa}\\
{}& equation math \label{eq:spb}\\
{}& equation math \label{eq:spc}
\end{align}
\end{subequations}

worked for me. The "sp" was arbitrary; it seems to be a tag for the remaining subequations (corrected in comment below). {}& was to left align the equations.

This post was helpful.

Blaise
  • 143
  • 1
    your comment about sp seems a little strange, \label has no effect on the numbering of this equation, and the whole eq:spb string is arbitrary and could equally be \label{wibble} it allows you to reference the equation from elsewhere with \eqref{eq:spb} (or \eqref{wibble}` ) – David Carlisle May 30 '19 at 09:56