When you can’t find it or it doesn’t exist, then build it yourself! So it went with the concatenation symbol in latex that I was looking for. I’m really curious why it is not in the standard symbol set in for example WinEdt where you can find a huge collection of beautiful mathematical symbols.
Anyway, with this command
\newcommand{\concat}{\ensuremath{+\!\!\!\!+\,}}
we can define our own concatenation symbol, which is actually just two pluses overlapping each other. As the command is defined, we can just use it by doing
$a \concat b$
which results in a concatenation of a and b as displayed in the image below. 
It is important to note that for the effect to happen you need to put the concatenation in math mode. Otherwise, you’ll get the pluses too tight to each other.
The total LaTeX document would look something like this:
\documentclass[a4paper]{article}
\newcommand{\concat}{\ensuremath{+\!\!\!\!+\,}}
\begin{document}
$a \concat b$
\end{document}
In one of my previous posts I have given a solution for solving the problem of Realtek High Definition Audio not being recognized on Windows 7.
Today I was dealing with nearly the same problem but on a different PC. It was a Medion PC (not relevant), of which the motherboard had an onboard Azalia/AC97 Audio controller. Windows 7 just displayed that there was no audio device recognized, so I went to the BIOS settings as described in my previous post, but the problem was that it had only two choices: Auto and Disabled. So there was no way of getting it to work with the solution I described before.
Luckily, I found another solution that worked very well and solved the problem. You can do the following:
1. Download the following file: UDAX009-AZA10-Logo09.59.73-flexbass
2. Unpack it.
3. Right click on the file setup.exe and click on properties. Now in the tab Compatibility change the Compatibility mode to Windows XP Service Pack 2.
4. Now run the setup as administrator. This is important since it needs administrator privileges to its thing.
5. When the setup is finished, restart your system and you should have your audio working.
I think this can help a lot of people that are currently dealing with the same problem. Much thanks goes to Luis Rato who described the original post and provided the above file. In case you have additional problems, visit his post here.