Imagine a book about occupations with a table of contents divided into chapters organized by interest fields, subchapters organized by level of income offered, subsubchapters organized by physical strength required, and so on through ten tiers of classification. This work of classification would be impressive, but would still be helpful only to the user who wants to search using the characteristics in the (arbitrarily) hierarchic order given.
Source: wiktionary
A number of commands have been devised to generically code a publication into its major parts, such as sections, chapters, subchapters, subsubchapters, appendices, subappendices, etc.
Source: wiktionary
This „monograph" has a lot of features of a good textbook (index, list of symbols, problems and exercises gathered in subsubchapters named „Further Topics", etc. ), but it presupposes some basic knowledge in (general) mathematics.
Source: wiktionary
In addition, the following persons offered feedback on individual chapters, subchapters, or perhaps even subsubchapters, of the manuscript: Ryan Acton, Scott Aikin, ...
Source: wiktionary
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