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Results tagged with fourier-analysis
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user 56892
The representation of functions (or objects which are in some generalize the notion of function) as constant linear combinations of sines and cosines at integer multiples of a given frequency, as Fourier transforms or as Fourier integrals.
2
votes
1
answer
239
views
Locality of homogeneous pseudo-differential operator
Let $P$ be a polynomial in several variables, and let $P(D)$ be the corresponding differential operator. Obviously, $P(D)$ is a local operator, in the sense that I need only to know the function $u$ i …
- 562
2
votes
0
answers
188
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"Direct" proof (without hypercontractivity) of equivalence of moments?
Let $(x_i)_{i \in \mathbb{N}}$ be a family of independent $\pm 1$ centered Bernoulli random variables, and let $p, q > 1$. There exists a constant C such that for every (finite) linear combination $Y$ …
- 562