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I am using the makeidx indexing package.

I am trying to make an index and I want to group similar names, like say {continious function, differential function, etc} together, i.e. so that it displays it like

functions, continious, ... p.10
           differential, . p.20 

etc.

I tried \index{&functions&, continious} but that does not work. Sorry I could not find anything on the web. Cheers.

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    Are you after \index{functions!continuous} and \index{functions!differential}? – Paul Gessler Dec 28 '15 at 20:00
  • take a look at the documentation for makeindex:, the program that does the sorting. that's where the input is described. texdoc makeindex` if you're working on a tex live installation. – barbara beeton Dec 28 '15 at 20:00
  • cheers mate. the ! was exactly what I was looking for. – I.P Dec 28 '15 at 20:18
  • @ChristianHupfer I'll answer if we can't find a duplicate. Did you find one? I've been unsuccessful in searching so far. – Paul Gessler Dec 28 '15 at 20:59
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    @barbarabeeton texdoc works also for miktex. – touhami Dec 28 '15 at 21:22
6

Groups like these are known as subentries in makeindex terminology. You can create them using the ! character in your index command to create the nesting structure; for example:

\index{functions!continuous} 
\index{functions!differential}

Sub-subentries are also allowed, by using two exclamation points:

\index{equations!differential!linear}

however, deeper nesting is not supported by LaTeX and makeindex.

The makeindex manual describes the usage of these and other special characters for handling index entries in detail.

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