There are tools for downloading the entire wikipedia database (above 8 Gb without pictures), but I would like to download only physics and maths pages, to view them offline. Wikipedia pages have a tree structure in categories, so it should be possible.
Please see here http://en.m.wikipedia.org/wiki/Wikipedia:Database_download#section_1
"To download a subset of the database in XML format, such as a specific category or a list of articles see(...)" and a link to some other page from which, after many efforts, I could surely get what I want. I am just wondering if anyone has already done it and can save me/us the effort with a few "how to" guidelines.
I know wikipedia seems for many of you not much an orthodox source, but it is usually an excellent introduction to areas that are not in your main line of research/study. I miss it very often while commuting.