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Apr 27, 2019 at 18:39 answer added fedja timeline score: 2
Apr 26, 2019 at 19:31 history edited Glorfindel CC BY-SA 4.0
broken image fixed (click 'side-by-side' to see the difference; image retrieved via Wayback Machine); for more info, see https://meta.mathoverflow.net/a/4058/70594
Mar 10, 2017 at 9:42 history edited CommunityBot
replaced http://s3.postimg.org/ with https://s3.postimg.org/
Jan 28, 2014 at 21:56 history edited user9072
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Mar 26, 2013 at 21:24 history edited Anand CC BY-SA 3.0
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Mar 26, 2013 at 16:41 history edited Anand CC BY-SA 3.0
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Mar 26, 2013 at 16:34 history edited Anand CC BY-SA 3.0
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Mar 26, 2013 at 16:24 comment added Anand Dear Barry Cipra, thanks for your comments. Please simply choose $a=1$ and a negative $b$.
Mar 26, 2013 at 16:22 comment added Barry Cipra This may be of no help in solving the problem, but writing $b=c/\sqrt{a}$ and $x=\sqrt{a}u$ certainly simplifies the look of the expression.
Mar 26, 2013 at 16:00 history edited Anand CC BY-SA 3.0
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Mar 26, 2013 at 15:46 history edited Anand CC BY-SA 3.0
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Mar 26, 2013 at 15:36 history edited Anand CC BY-SA 3.0
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Mar 26, 2013 at 15:27 history edited Anand CC BY-SA 3.0
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Mar 26, 2013 at 15:18 comment added Anand Dear Noah S. The derivatives of $W_{a,b}(x)-W_{a,b}(-x)$ is a bit nasty. To prove it changes sign twice is not that easy, there are some recursions.
Mar 26, 2013 at 15:08 comment added Noah Schweber It looks like the derivative of $W_{a, b}(x)-W_{a, b}(-x)$ isn't too nasty, can show that it only changes sign twice?
Mar 26, 2013 at 15:06 history edited Anand CC BY-SA 3.0
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Mar 26, 2013 at 15:00 history edited Anand CC BY-SA 3.0
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Mar 26, 2013 at 14:53 history asked Anand CC BY-SA 3.0