LaTeX how do I write an equation

[Nusc]

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

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

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

[Hepth]

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

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

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


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

[Hepth]

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"

[Nusc]

Thanks for the input guys.

[D H]

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.