Question

Prove a lower bound on $\left|\int_{-\infty}^{+\infty}k(t) f(t) e^{\lambda_n ti}dt\right|$.

score 23 · Answer 1 · 2026-04-29 18:13:42

23

Views

Prove a lower bound on $\left|\int_{-\infty}^{+\infty}k(t) f(t) e^{\lambda_n ti}dt\right|$.

Published on 29 Apr 2026 - 18:13

score 134 · Answer 2 · 2026-04-14 01:11:02

134

Views

Support of a convolution with the help of Titchmarsh theorem

Published on 14 Apr 2026 - 1:11

score 317 · Answer 3 · 2026-04-14 14:13:52

317

Views

Smoothness-and-decay relationship of the Fourier transform

Published on 14 Apr 2026 - 14:13

score 324 · Answer 4 · 2026-04-09 03:25:19

324

Views

What is a window function with positive spectrum?

Published on 09 Apr 2026 - 3:25

score 75 · Answer 5 · 2026-04-10 12:20:20

75

Views

Is it possible for continuous fourier transform of a function to have values only on finite number of frequencies?

Published on 10 Apr 2026 - 12:20

score 1k · Answer 6 · 2026-04-11 13:54:24

1k

Views

Convergence property of DTFT toward DFT when function is periodic

Published on 11 Apr 2026 - 13:54

score 126 · Answer 7 · 2026-04-12 08:00:33

126

Views

Fourier integral problem?

Published on 12 Apr 2026 - 8:00

score 51 · Answer 8 · 2026-04-15 20:09:40

51

Views

If $f(t)$ is periodic, is there any $t$ that would equal to DC components?

Published on 15 Apr 2026 - 20:09

score 3.3k · Answer 9 · 2026-04-17 11:07:32

3.3k

Views

Find the Fourier series representation of $f(t)=\sin(3\pi t)$

Published on 17 Apr 2026 - 11:07

score 55 · Answer 10 · 2026-04-08 18:26:12

55

Views

How to check periodicity of $f(t)$ using samples

Published on 08 Apr 2026 - 18:26

score 430 · Answer 11 · 2026-04-11 23:17:46

430

Views

Why must the Fourier transform of a compactly support function not have compact support?

Published on 11 Apr 2026 - 23:17

score 164 · Answer 12 · 2026-04-14 17:10:03

164

Views

If $u\in H^2(R^n)$, how to prove $\|D^2u\|_{L^2}$ is equal to $\|\Delta u\|_{L^2}$ using Fourier transforms?

Published on 14 Apr 2026 - 17:10

score 562 · Answer 13 · 2026-04-11 21:01:50

562

Views

Negative index Sobolev spaces, properties

Published on 11 Apr 2026 - 21:01

score 677 · Answer 14 · 2026-04-09 18:46:56

677

Views

Fourier series for convex plane curves.

Published on 09 Apr 2026 - 18:46

score 560 · Answer 15 · 2026-04-12 08:00:30

560

Views

Fourier Amplitude Sensitivity Test (FAST)

Published on 12 Apr 2026 - 8:00

List Question

Prove a lower bound on $\left|\int_{-\infty}^{+\infty}k(t) f(t) e^{\lambda_n ti}dt\right|$.

Support of a convolution with the help of Titchmarsh theorem

Smoothness-and-decay relationship of the Fourier transform

What is a window function with positive spectrum?

Is it possible for continuous fourier transform of a function to have values only on finite number of frequencies?

Convergence property of DTFT toward DFT when function is periodic

Fourier integral problem?

If $f(t)$ is periodic, is there any $t$ that would equal to DC components?

Find the Fourier series representation of $f(t)=\sin(3\pi t)$

How to check periodicity of $f(t)$ using samples

Why must the Fourier transform of a compactly support function not have compact support?

If $u\in H^2(R^n)$, how to prove $\|D^2u\|_{L^2}$ is equal to $\|\Delta u\|_{L^2}$ using Fourier transforms?

Negative index Sobolev spaces, properties

Fourier series for convex plane curves.

Fourier Amplitude Sensitivity Test (FAST)

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