Xy-pic is cool!
The image you see on the right was made with the Xy-pic macros for TeX. It’s surprisingly easy to make complicated pictures like the one on the right using Xy-pic, and because it’s a package for [LaTeX][] it’s easy to include mathematics in the diagrams.
I discovered the wonderful Xy-pic by reading a note about LaTeX made by Lars Madsen, take a look here: http://home.imf.au.dk/daleif/latexkursus/. There’s a lot of really good stuff in the note, so if you’re trying to learn LaTeX and want some Danish material to get started with, then you should definitely take a look at it.
You should also read The no so Short Introduction to LaTeX by Tobias Oetiker for even more information about LaTeX. It covers everything you’ll need to know to get started using LaTeX.
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