# LaTeX how do I write an equation

1. Mar 18, 2010

### Nusc

Hey, how do I write an equation without the text looking all garbled up:

\frac{\partial u}{\partial x} + \frac{\partial w}{\partial z} = 0 with u = v_{x} and w = v_z

I don't want to use  since I want this eqn centered and numbered but with text immediately following the major expression.

Last edited by a moderator: Oct 18, 2011
2. Mar 18, 2010

### Hepth

Re: LaTeX

possible solutions:
Code (Text):

\begin{array}{ccccc}
\frac{\partial u}{\partial x} + \frac{\partial w}{\partial z} = 0 & with & u = v_{x} & and & w = v_z
\end{array}
Code (Text):
\begin{eqnarray}
\begin{array}{rlcll}
&&\frac{\partial u}{\partial x} + \frac{\partial w}{\partial z} = 0&& \\ \mathrm{with:} & u = v_{x} & \mathrm{and} & w = v_z&
\end{array}
\end{eqnarray}
its the \mathrm{} that changes font in the mathtype and the arrays that let you space things correctly.

3. Mar 18, 2010

### D H

Staff Emeritus
Re: LaTeX

Use the \text macro. It is designed specifically for this problem, inserting short amounts of text within math.

\frac{\partial u}{\partial x} + \frac{\partial w}{\partial z} = 0
\ \text{with}\ u = v_{x} \ \text{and}\ w = v_z

$$\frac{\partial u}{\partial x} + \frac{\partial w}{\partial z} = 0 \ \text{with}\ u = v_{x} \ \text{and}\ w = v_z$$

4. Mar 18, 2010

### Hepth

Re: LaTeX

what is that a part of? Because mathematica always puts that in its LaTeX output, but my version of LEd with MikTeX 2.8 doesn't recognize "\text"

5. Mar 18, 2010

### Nusc

Re: LaTeX

Thanks for the input guys.

6. Mar 18, 2010

### D H

Staff Emeritus
Re: LaTeX

\text is provided by the AMS math package, the ReVTeX package, and others.

As a general rule, always treat autogenerated code as suspect. That autogenerated junk rarely is a good pattern to follow. From the appearance, it looks like mathematica's generated LaTeX code fits that rule quite nicely.