# LaTeX how do I write an equation

• LaTeX
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:

## Answers and Replies

Hepth
Gold Member

possible solutions:
Code:
$$\begin{array}{ccccc} \frac{\partial u}{\partial x} + \frac{\partial w}{\partial z} = 0 & with & u = v_{x} & and & w = v_z \end{array}$$
Code:
\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.

D H
Staff Emeritus
Science Advisor

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

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

Hepth
Gold Member

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"

Thanks for the input guys.

D H
Staff Emeritus
Science Advisor

what is that a part of?
\text is provided by the AMS math package, the ReVTeX package, and others.

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