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For questions about writing mathematical texts, e.g. questions of style, mathematical prose, structuring of mathematical exposition, referencing prior work etc.
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How to refer to plural of mathematical symbols - with or without an apostrophe
Shall you use one of these, according to Oxford Dictionaries Online, you should only use an apostrophe "for the sake of clarity", therefore opting for the first option ($x_i$s).
There are cases, like …