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Topic : Plural of single letter variables Excuse me if I am on the wrong StackExchange site. I write about Physics in English and typeset that with LaTeX. So I have a variable c, and there are two - selfpublishingguru.com

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Excuse me if I am on the wrong StackExchange site. I write about Physics in English and typeset that with LaTeX.

So I have a variable c, and there are two of them in the same expression. I want to say that the formula looks ill-defined because the same letter represents for two different things. How would I write the plural of the variable c? Those are my ideas:

From the APA Style blog I gather that “cs” is the way to do it, but I am not sure about this. What is the way to go?


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Some style guides recommend using an apostrophe, although it might not make logical sense, when speaking of "letters as letters" --

Can you say your abc's?

Mind your p's and q's.


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