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Q&A singular or plural for index entries

I am in the final stages of writing a book and currently I am preparing the index. Are there any rules whether index entries should be listed in singular or plural? Currently I have Markov chains...

2 answers  ·  posted 11y ago by jochen‭  ·  last activity 4mo ago by Herem1956‭

#3: Attribution notice added by user avatar System‭ · 2019-12-08T02:46:13Z (over 4 years ago)
Source: https://writers.stackexchange.com/q/7441
License name: CC BY-SA 3.0
License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision by user avatar jochen‭ · 2019-12-08T02:46:13Z (over 4 years ago)
I am in the final stages of writing a book and currently I am preparing the index. Are there any rules whether index entries should be listed in singular or plural? Currently I have

    Markov chains, 20, 30-40, 50
        with discrete state space, 33
        with continuous state space, 38

Should I change this to "Markov chain"?

#1: Imported from external source by user avatar System‭ · 2013-03-13T17:43:39Z (about 11 years ago)
Original score: 4