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Oct 30, 2016 at 14:09 history closed Willie Wong
Alex Degtyarev
Franz Lemmermeyer
Chris Godsil
Alexey Ustinov
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Oct 30, 2016 at 13:43 answer added user97743 timeline score: 1
Oct 30, 2016 at 13:08 review Close votes
Oct 30, 2016 at 14:09
Oct 30, 2016 at 12:53 comment added Willie Wong By contradiction, suppose $p$ is in the interior of the ball and attains the maximum with $\nabla f$ in the direction $v$. Take the line through $p$ in the direction $v$ and look at the restriction of $f$ on the line. You reduce to the 1D problem.
Oct 30, 2016 at 11:55 history asked user97743 CC BY-SA 3.0