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17
Acting with a finite number of rotations on a set of positive measure can you fill almost the whole circle?
mathoverflow.net

9
Gradient $L^p$ estimates for heat equation
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8
Interpolation theory and $C^k$-spaces
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8
A problem concerning a divergent function on $[0, 1]$
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8
Eigenvalues and eigenfunctions of the Laplace operator on entire plane
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8
Unique solutions to the heat equation on $\mathbb{R}^3$
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8
Is $L^p(X,\ell^p)$, $1<p<\infty$, uniformly convex?
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8
Is it possible to obtain the inequality $\|\nabla f\|_{L^{2p}} \leq C (\|f\|_{L^\infty} \|f\|_{W^{2, p}})^{1/2}$ from interpolation/harmonic analysis?
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7
Elementary inequality generalizing convexity of a function on a segment
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7
Why is $\frac{1}{|x|^{n-2}}u(\frac{x}{|x|^2})$ harmonic if $u$ is harmonic?
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7
Proving an integral identity
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6
Angle of analyticity of semigroup
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6
Spherical harmonics – pointwise and L1 bounds
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6
Does this condition on $f$ imply essential boundedness on compacts?
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6
Is this an $L^p-L^{\infty}$ operator?
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5
Are there $f, g$ such that $\int_{S^{1}} |f'|^{2}+|g'|^{2}d\theta-2\int_{S^{1}}f'g<0,$ where $f'=\frac{\partial f}{\partial \theta}$
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5
2D Fourier transform of log function
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5
The behavior of $ \nabla u $ on the boundary for Poisson equations
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5
A function is of bounded variation if and only if the errors of its best approximation by trigonometric polynomials satisfy $\sum\frac{e_n}n<\infty$?
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5
Do two ways to differentiate Lipschitz functions coincide?
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5
How to use comparison principle to prove the following inequality about Laplace equation?
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5
A fractional weighted Poincaré inequality
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