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Apr 9, 2021 at 4:13 vote accept Jacob Lu
Apr 3, 2021 at 9:46 answer added username timeline score: 2
Apr 3, 2021 at 3:04 history bumped CommunityBot This question has answers that may be good or bad; the system has marked it active so that they can be reviewed.
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Mar 9, 2020 at 0:06 answer added Giorgio Metafune timeline score: 0
Mar 8, 2020 at 0:35 comment added Jacob Lu Yes, you are right @GiorgioMetafune. This question is closely related to the trig series problem. And I think yes, if $b = c$ is a constant different from any non-negative integer, then $u$ must be zero.
Mar 7, 2020 at 10:25 comment added Giorgio Metafune I guess that this is similar to the other question you asked on trigonometric series. The only thing I see is that $u=0$ if $b=c$, where $c$ is a constant different from any natural number. Do you agree or know orther cases?
Mar 5, 2020 at 1:48 history asked Jacob Lu CC BY-SA 4.0