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Spencer
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15 Questions

Score Activity Newest Views
53 votes
17 answers
16k views

Computer science for mathematicians

7 votes
4 answers
6k views

The characteristic (indicator) function of a set is not in the Sobolev space H¹

21 votes
3 answers
5k views

Why pi-systems and Dynkin/lambda systems? On the relative merits of approaches in measure theory.

11 votes
5 answers
4k views

Brownian motion, martingales, Markov Chains - Rosetta Stone

10 votes
3 answers
4k views

Is the Lie algebra-valued curvature two-form on a principal bundle P the curvature of a vector bundle over P?

40 votes
14 answers
4k views

A set for which it is hard to determine whether or not it is countable.

17 votes
3 answers
3k views

Why is the harmonic oscillator so important? (pure viewpoint sought). How to motivate its role in Getzler's work on Atiyah-Singer?

4 votes
2 answers
2k views

Inclusions of $C^{k,\alpha}$ spaces

2 votes
2 answers
1k views

When is the group of homeomorphisms of a compact space locally compact?

6 votes
3 answers
818 views

Divergence form Elliptic PDE Removable Singularity/Regularity Question

8 votes
1 answer
281 views

Closed geodesics in free smooth loop space?

3 votes
2 answers
235 views

What is the "real osculating space" of a (minimal) immersion?

5 votes
1 answer
132 views

Reference for higher order Campanato Lemmas, e.g. `Sufficiently fast L^2 decay on balls to affine functions implies C^{1,\alpha}'

3 votes
0 answers
108 views

What dimension bound is known on the singular set of a linear combination of eigenfunctions of Laplacian?

0 votes
0 answers
102 views

Must the Lebesgue measure of a $\rho$ - neighbourhood of an $(n-2)$ - dimensional set be at least $c\rho^2$?