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localghost wrote: So I ask once again: Why don't you just use the package manager of your TeX distribution to install packages?

Sorry, I don't know how to use the package manager of TeX, this is the most important thing I want to tell. Can you teach me how to use this one?

First, I downloaded full .dtx file in this site: http://ctan.org/tex-archive/macros/latex/contrib/mh
Then, I read how to install .dtx package in this site: http://en.wikibooks.org/wiki/LaTeX/Installing_Extra_Packages
I couldn't install, so when I type

\documentclass{article}
\usepackage{empheq ...

Thank you very much for your help, I solved my problem.

First opinion, I know the equation environment but the most thing I want here is the space between , and if. This is my code:
\begin{equation}
Th(\text{flow1}) = Th(\text{flow2}) = G, \:\:\:\:\:\:\:\text{if} \:\:\:G < \frac{B}{3}
\end ...

Many thanks for your help, you are very kind to me. But I still can't solve my problem.

I used {equation} environment like this:
\begin{equation}
Th(flow1) = Th(flow2) = G, if G < \frac{B}{3}
\end{equation}
And the result is displayed as formula (3.1)

The second one need the empheq package but I ...

Sorry everyone, but I tried to search many sites but no result. I want to write equation like the attached one.

Thanks so much