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Dorian's user avatar
Dorian
  • Member for 13 years, 7 months
  • Last seen more than a month ago
26 votes
11 answers
4k views

What kind of Lagrangians can we have?

21 votes
2 answers
5k views

Elliptic regularity for the Neumann problem

19 votes
3 answers
8k views

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

17 votes
5 answers
6k views

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

15 votes
3 answers
1k views

Stronger version of the isoperimetric inequality

9 votes
3 answers
2k views

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

8 votes
1 answer
654 views

How does electric potential relate to mean curvature?

6 votes
2 answers
1k views

An element of $(L^{\infty})^*$ which does not seem to be a finitely additive abs. cont. measure.

6 votes
6 answers
2k views

Application of bounded spectral theory.

5 votes
3 answers
2k views

Posing Cauchy data for the heat equation: $t=0$ a characteristic surface?

4 votes
1 answer
7k views

Criterion for finite time blowup of an ODE

4 votes
1 answer
476 views

How to minimize the length of a graph connecting n points in $\mathbb{R}^3$

4 votes
1 answer
341 views

Is there a characterization of generalized constant mean curvature surfaces?

4 votes
2 answers
707 views

What is the constant in the rate of exponential convergence for mean curvature flow?

3 votes
1 answer
342 views

Classification of limits under volume preserving mean curvature flow?

3 votes
1 answer
194 views

Different forms of Bonnesen's strong isoperimetric inequality in the plane.

3 votes
0 answers
278 views

What are the most general types of curves in $\mathbb{R}^2$ for which Gauss-Bonnet holds?

3 votes
0 answers
301 views

What does convergence in the $L^2$ sense to a constant mean curvature surface imply?

3 votes
0 answers
348 views

Best Poincare constants on the surface of a ball

3 votes
2 answers
955 views

Maximum Principle fails when u∉C²(Ω)? Can't find example.

3 votes
2 answers
624 views

A function in $W^{1,p}(\Omega)$ for $1 < p < n$ which is not differentiable a.e

3 votes
1 answer
424 views

Spectral Galerkin method for a semi-linear parabolic PDE

3 votes
1 answer
455 views

Approximating functions in $H_0^1(\Omega)$ by piecewise affine ones.

3 votes
1 answer
2k views

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

2 votes
1 answer
1k views

Elliptic regularity on bounded domains

2 votes
3 answers
1k views

Coefficients from Stone–Weierstrass versus Fourier transform

2 votes
1 answer
237 views

Existence of non-trivial solutions to Dirichlet problem with a potential lying between eigenvalues.

2 votes
2 answers
429 views

Existence of rearrangements of functions in $L^p([0,1])$ when given a measure preserving map

2 votes
1 answer
5k views

Fourier series of non-periodic functions

2 votes
0 answers
595 views

Compatibility conditions for parabolic regularity