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.

"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.

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## closed as off topic by Qmechanic♦, David Z♦Nov 14 '12 at 6:32

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You want to download all the wiki pages?! It seems improbable that you'd ever need a reference of all the wikipedia pages on physics and math. Much better would be to look at the articles that interest you and then download them. But that's just my opinionated suggestion. :) –  Kitchi Nov 12 '12 at 11:49
@Kitchi: Doesn't your suggestion imply you know upfront what you're going to look up? –  NikolajK Nov 12 '12 at 12:27
–  NikolajK Nov 12 '12 at 12:46
It is not clear to me that this is on-topic. If you have a list of the pages it probably belongs on Super User (if you are looking for an existing app) or Stack Overflow (if you want to code it yourself). There doesn't seem to be a site to ask about identifying such pages (not webapps, nor webmasters): I'd start by looking at the code of some sample pages to see if wikipedia attaches some indexing data that you could take advantage of. –  dmckee Nov 12 '12 at 15:58
I have rewritten the question. Please consider that it is essentially a bibliography question, before closing it (actually, it deals on how to get a huge general math and physics book in your portable device). Thanks. –  Eduardo Guerras Valera Nov 12 '12 at 18:54

Note that a lot of the pages returned by CatScan will be article talk pages, since that's where the WikiProject templates normally go. Depending on the output format you choose, you may need to postprocess the list to remove the Talk: prefix from page titles.