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The formatting used in this article seems to be completely random. Some headers are topics, some are books, and these is no coherent organization or hierarchy to them. To add to the confusion, sometimes books are not written in italics and sometimes they aren't. Kaldari (talk) 18:32, 4 January 2013 (UTC)
Actually, all the titles are section headers, but vary from level 3 to 5. The MOS says that normally, section headings should not contain links. Since many of the article titles do have links, it would be better to present them as bulleted lists. RockMagnetist (talk) 19:52, 4 January 2013 (UTC)
I have changed the heading level of all the book titles to 5. I have also increased the TOC depth to 3: this illustrates a basic problem with the current style. Look at section 4 (Analysis). Even though Introductio in analysin infinitorum is a level 5 header, it is numbered as level 3 because there are no level 3 or 4 headers preceding it. That puts Introductio at the same level as Calculus and other level 3 headers below it. I don't know of any way of adjusting the TOC controls to fix this. RockMagnetist (talk) 20:20, 4 January 2013 (UTC)