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### How to differentiate between (elementary-number-theory) and (number-theory)

The tags elementary-number-theory and number-theory have been recently mentioned in this question: There are 1,732 questions tagged both elementary-number-theory and number-theory However, in that ...
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### Should questions on (matrices) and (matrix-equations) be also tagged as (linear-algebra)?

Recently the following text was added to linear algebra tag-excerpt: For questions specifically concerning matrices, use the (matrices) tag. For questions specifically concerning matrix equations, ...
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Should tags be added based on answers? The specific case I have in mind is that every once in a while I answer questions using inclusion-exclusion but the question doesn't refer to inclusion-...
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### Which (if any) inequalities with real numbers should have separate tags?

There are certainly many inequalities which are rather important and useful and which appear frequently in various areas in mathematics (AM-GM, Jensen, Cauchy-Schwarz, etc.) The question I want to ask ...
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Recently, I gave a solution to a complex analysis problem that avoided the standard complex analytic tools, but relied on a property of the modified Bessel function of the first kind. I bet this ...
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### Should I change the tag to the correct one, even if the asker does not know the topic?

See this question: Question on the notation $ds^2=dx^2+dy^2$ : what does it really mean? The question is really about differential geometry and metric tensor. The asker originally tagged the question ...
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### Is it okay to include a tag to get attention of a specific community?

Imagine a question fitting into tags z y and x, but you know (and mention) a special case might be answered by a certain field of mathematics which is included in tags w and v and you think people ...
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### Should we add tags in order to highlight techniques in an answer, that are not obviously related to the question? [duplicate]

Say you ask a question like this one, which you believe should just be a matter of some group theory, so tag using a couple of relevant group theory tags, but you get an answer which ends up using ...