A Brief Introduction to Matrix Algebra

I made up a short guide on the basics of matrix algebra for the recent pattern analysis course to kinda help the catch-uppers.
Despite the fact that it did not seem to help a lot (it's probably too compressed for a beginner and too obvious for the one who knows), I still decided to make it into a more-or-less complete document, which maybe someday end up being useful.

The good point about it is that it summarizes about pretty much all of linear algebra that I, personally, know and find useful.

The PDF is available here.