Search Results
| Search type | Search syntax |
|---|---|
| Tags | [tag] |
| Exact | "words here" |
| Author |
user:1234 user:me (yours) |
| Score |
score:3 (3+) score:0 (none) |
| Answers |
answers:3 (3+) answers:0 (none) isaccepted:yes hasaccepted:no inquestion:1234 |
| Views | views:250 |
| Code | code:"if (foo != bar)" |
| Sections |
title:apples body:"apples oranges" |
| URL | url:"*.example.com" |
| Saves | in:saves |
| Status |
closed:yes duplicate:no migrated:no wiki:no |
| Types |
is:question is:answer |
| Exclude |
-[tag] -apples |
| For more details on advanced search visit our help page | |
Results tagged with harmonic-analysis
Search options not deleted
user 104330
Harmonic analysis is a generalisation of Fourier analysis that studies the properties of functions. Check out this tag for abstract harmonic analysis (on abelian locally compact groups), or Euclidean harmonic analysis (eg, Littlewood-Paley theory, singular integrals). It also covers harmonic analysis on tube domains, as well as the study of eigenvalues and eigenvectors of the Laplacian on domains, manifolds and graphs.
3
votes
Accepted
Reverse Markov inequality
As you noticed, for $K < 1$ (some form of) it is true. I will show that it is false for $K \ge 1$. It is enough to construct functions $f_n$ on $[0, 1]$ with $\int |f_n| = \varepsilon$ and $\int |f_n …
- 6,476
5
votes
Accepted
Special function in the Hardy space
First of all both of these facts are wrong. For the first one we have to assume that $f$ is not a constant (since $f(z) = i$ works). For the second one it is actually a classical and very important re …
- 6,476
5
votes
Accepted
Constructing a function $u$ such that $\int_{\mathbb{R}^2}|\eta-\xi||\hat{u}(\eta)|^2|\hat{u...
(Un?)fortunately, there are no such functions. The idea is simple, yet powerful:
if the double integral $\int\int d\xi d\eta$ is finite, then for almost all $\eta$ the $d\xi$ integral is finite as wel …
- 6,476
2
votes
Accepted
A question on finite Fourier series
No problem, this is doable already for $N=2$. The idea is as follows: at the point of the maximum first derivative must vanish, and yet we want to separate the maximum into two by adding something sma …
- 6,476