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I have previously asked an obvious question and got no answer but very helpful comments which answer me. I find that if I change a little, qualification of question and may be answers will grow up.

Two issues:

  1. But if I do this later comments will be silly.
  2. Existing question is favorite!!! for one member.

Which should I do: New question or change old bad question?

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  • $\begingroup$ This one? $\endgroup$ – user99914 Nov 18 '15 at 9:47
  • $\begingroup$ @JohnMa Yes I want to ask for "method which determine functions have at least one periodic" instead. $\endgroup$ – Hoseyn Heydari Nov 18 '15 at 9:52

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