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Jun 18, 2013 at 0:34 answer added Yemon Choi timeline score: 9
Jun 15, 2013 at 20:04 vote accept Fabian Lenhardt
Jun 15, 2013 at 20:04 comment added Fabian Lenhardt I would have been somewhat disappointed in mathematics if there were such a criterion, so everything is fine.
Jun 14, 2013 at 20:22 comment added Yemon Choi (Probably even more is in Zygmund, but I find those books hard to carry, let alone read)
Jun 14, 2013 at 20:19 comment added Yemon Choi Reading through Katznelson's Intro to Harmonic Analysis will give lots of circumstantial evidence that the answer to your question is "not really, and probably not ever". Certainly it is not enough to look at the sequence $(|a_n|)$
Jun 14, 2013 at 11:44 answer added Mike Jury timeline score: 9
Jun 14, 2013 at 10:20 history asked Fabian Lenhardt CC BY-SA 3.0