# Thread: Labeling Equations

1. ## Labeling Equations

Hi all,

May I get help in how to label system of equations?
I usually use the following
\label{eqn:TW}
\begin{split}
u_{t}& =u_{xx}+f(u,v),\\
v_{t}& =g(u,v),
\end{split}

I would like here to get a lebel but not number as usual I want it something different. For example, instead of getting (1) I would like to get (TW) as a lebel.

Any help will be greatly appreciated.

Thank you in advance.
RainyCloud

2. Is there any special package should be used?

3. ## equation tags

Hi RainyCloud,

because there was no answer to your question perhaps it's still useful for you: the \tag command of amsmath does what you were looking for. With your example:
Code:
$$\label{eqn:TW} \begin{split} u_{t}& =u_{xx}+f(u,v),\\ v_{t}& =g(u,v), \end{split}\tag{RW}$$
You don't need an additional package because you're already using amsmath. There's a starred version \tag* that's not using parentheses by default.

Stefan