Currently, has 2202 questions and 101 followers, while has only 324 questions and 9 followers. I suggest merging the two, but also keeping "trigonometric-series" as a tag synonym of "fourier-series".

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    $\begingroup$ I do not think this is a good idea; these are different topics. Both tags serve different purposes, and I would prefer keeping them separate. The theory of trigonometric series is a (very) classical topic, and as such not so active nowadays, which explains the smaller number of questions. (Personally, I am interested in some research problems that definitely belong to this area, and for which the techniques of Fourier series seem irrelevant.) $\endgroup$ – Andrés E. Caicedo Jun 13 '16 at 12:27
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    $\begingroup$ @AndrésCaicedo: The current description of "fourier-series" says: "Questions on Fourier series, the expansion of a function in terms of basis functions that satisfy an orthogonality relation. Usually, complex exponentials or sines and cosines are used." To me, this is not significantly different from the current description of "trigonometric-series" (notice that Fourier series explicitly mention sines and cosines as a possible basis). $\endgroup$ – Alex M. Jun 13 '16 at 12:34
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    $\begingroup$ @AndrésCaicedo: For abstract Fourier analysis there is the tag "harmonic-analysis". $\endgroup$ – Alex M. Jun 13 '16 at 12:35

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