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Questions
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A counter example to Hahn-Banach separation theorem of convex sets.

mar 9 11 at 22:00 Maciej S. 333●1●7

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A Hölder continuous function which does not belong to any Sobolev space

dec 5 at 21:47 Pietro Majer 19.7k●1●24●69

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What kind of Lagrangians can we have?

nov 21 at 9:51 Javier Álvarez 557●1●7●12

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Fourier series of non-periodic functions

sep 30 10 at 4:50 Dick Palais 10k●1●39●62

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When can I use Fourier Series to solve the heat/wave equation on $[0,L]$?

sep 13 10 at 12:22 MathOverflow♦ 1●2●3

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Criterion for finite time blowup of an ODE

aug 28 10 at 20:43 Will Jagy 12.5k●1●26●45

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Elliptic regularity for the Neumann problem

nov 3 11 at 14:44 deMiranda 51●4

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Coefficients from Stone Weierstrass versus Fourier Transform

aug 25 10 at 11:00 Helge 2,266●7●13

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Stronger version of the isoperimetric inequality

apr 12 12 at 15:33 Dorian 1,687●3●18

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A simple example where elliptic boundary regularity fails due to a kink in the domain

oct 8 10 at 10:27 Jitse Niesen 381●1●5

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