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I would say it depends on how the item is discussed in the body of the book. If a Markov chain is something referred to as a single entity, then index it as a single item. If you discuss several ...
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#4: Attribution notice removed
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System
·
2019-12-13T12:00:15Z (over 4 years ago)
Source: https://writers.stackexchange.com/a/7442 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#3: Attribution notice added
by
System
·
2019-12-08T02:46:14Z (over 4 years ago)
Source: https://writers.stackexchange.com/a/7442 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
I would say it depends on how the item is discussed in the body of the book. If a Markov chain is something referred to as a single entity, then index it as a single item. If you discuss several of them at once, or generalize (like saying "black holes have thus-and-such properties"), I'd use the plural.
#1: Imported from external source
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System
·
2013-03-13T18:33:37Z (about 11 years ago)
Original score: 2