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I ask this question in MO. then a user suggested me to ask it at MSE. But I could not find Elliptic PDE tag or index theory tag. Is it a good idea to suggest to MSE to produce such tags?

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Elliptic equations already exists.

I am slightly skeptical about "index theory": this phrase appears in 5 questions, and they are on different topics. While I do not strongly object to the tag, my expectation is that in a year's time we would find it filled mostly with questions about changing the index from $k$ to $k+1$ in some sum.

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  • $\begingroup$ thank you I added Elliptic equation to my question. Hoever there is no a tag "diff operators" which is suitable to my question. $\endgroup$ Feb 24 '15 at 21:06
  • $\begingroup$ math.stackexchange.com/questions/tagged/differential-operators $\endgroup$
    – user147263
    Feb 24 '15 at 21:11
  • $\begingroup$ I really thank you very much for your help. $\endgroup$ Feb 24 '15 at 21:14

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