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Q&A 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 of them in the same expression. I want to...

1 answer  ·  posted 9y ago by Martin Ueding‭  ·  last activity 5y ago by System‭

#3: Attribution notice added by user avatar System‭ · 2019-12-08T04:53:50Z (almost 5 years ago)
Source: https://writers.stackexchange.com/q/20258
License name: CC BY-SA 3.0
License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision by user avatar Martin Ueding‭ · 2019-12-08T04:53:50Z (almost 5 years ago)
Excuse me if I am on the wrong StackExchange site. I write about [Physics](https://physics.stackexchange.com/) in [English](https://english.stackexchange.com/) and [typeset](https://graphicdesign.stackexchange.com/) that with [LaTeX](https://tex.stackexchange.com/).

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:

[![enter image description here](https://i.stack.imgur.com/4PoYv.png)](https://i.stack.imgur.com/4PoYv.png)

From the [APA Style blog](http://blog.apastyle.org/apastyle/2011/08/the-grammar-of-mathematics-writing-about-variables.html) I gather that “_c_s” is the way to do it, but I am not sure about this. What is the way to go?

#1: Imported from external source by user avatar System‭ · 2016-01-02T14:20:23Z (almost 9 years ago)
Original score: 4