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May 11, 2018 at 16:54 comment added sasquires This isn't a one-line proof in any sense (it's actually 4.5 pages), but I was pleased to see that the whole thing can be done with elementary calculus.
Apr 15, 2016 at 3:47 history edited მამუკა ჯიბლაძე CC BY-SA 3.0
revived the link
Feb 2, 2016 at 15:40 comment added Wojowu The link is dead, but there is a working mirror on the Web Archive.
Sep 26, 2011 at 12:41 history answered Igor Rivin CC BY-SA 3.0