Question

Calculate DTFT of $\cos (\pi/3 n) (n^4u[n+4] + n^2 u[n+2] - n^4 u[n-2] - n^2 u[n-4])$

score 1k · Answer 1 · 2026-04-17 00:20:33

1k

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Calculate DTFT of $\cos (\pi/3 n) (n^4u[n+4] + n^2 u[n+2] - n^4 u[n-2] - n^2 u[n-4])$

Published on 17 Apr 2026 - 0:20

score 176 · Answer 2 · 2026-04-13 15:10:28

176

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Fourier transform either changes sign infinitely often far out or is continuous at $x=0$

Published on 13 Apr 2026 - 15:10

score 4.4k · Answer 3 · 2026-04-12 22:36:35

4.4k

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What boundary condition is imposed when Fourier transform is used for solving differential equation on infinite domain?

Published on 12 Apr 2026 - 22:36

score 748 · Answer 4 · 2026-04-11 23:26:50

748

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Show that the fourier transform is well-defined

Published on 11 Apr 2026 - 23:26

score 47 · Answer 5 · 2026-04-15 23:41:37

47

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For which negative values of $s$ is $\delta\in W^{2,s}(\mathbb{R}^{n})$?

Published on 15 Apr 2026 - 23:41

score 109 · Answer 6 · 2026-04-09 23:33:52

109

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An inequality for mean Lebesgue norms

Published on 09 Apr 2026 - 23:33

score 98 · Answer 7 · 2026-04-16 05:13:55

98

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Showing $\sum_{j=1}^{n}\left(\frac{\partial}{\partial x_{j}}\right)^{m}$ is not elliptic for odd $m$

Published on 16 Apr 2026 - 5:13

score 513 · Answer 8 · 2026-03-25 12:55:38

513

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Equidistribution modulo $1$ of certain exponential functions

Published on 25 Mar 2026 - 12:55

score 29 · Answer 9 · 2026-04-09 10:45:28

29

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Derivatives of Fourier Coefficients Recovery Transformation

Published on 09 Apr 2026 - 10:45

score 569 · Answer 10 · 2026-04-14 19:42:45

569

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derivative of the Fourier series

Published on 14 Apr 2026 - 19:42

score 79.7k · Answer 11 · 2026-04-13 04:10:44

79.7k

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Calculate Fourier series of $f(x)=x^2$ , $x \in \ [-\pi,\pi]$

Published on 13 Apr 2026 - 4:10

score 629 · Answer 12 · 2026-04-13 06:28:33

629

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Is any continuous, Lebesgue-integrable function on $\mathbb{R}^n$ vanishes at infinity?

Published on 13 Apr 2026 - 6:28

score 38 · Answer 13 · 2026-04-11 09:41:21

38

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Fourier Transform of Interval Scale Data

Published on 11 Apr 2026 - 9:41

score 35 · Answer 14 · 2026-04-16 04:37:50

35

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Calculate the convolution of $p_2(x)*u(x)$

Published on 16 Apr 2026 - 4:37

score 463 · Answer 15 · 2026-04-16 17:54:51

463

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Inverse Mellin transform of $f(s)= 2^{ \frac{s}{6} }\frac{\Gamma \left( \frac{s+1}{3/2} \right)}{ \Gamma \left( \frac{s+1}{2} \right)}$

Published on 16 Apr 2026 - 17:54

List Question

Calculate DTFT of $\cos (\pi/3 n) (n^4u[n+4] + n^2 u[n+2] - n^4 u[n-2] - n^2 u[n-4])$

Fourier transform either changes sign infinitely often far out or is continuous at $x=0$

What boundary condition is imposed when Fourier transform is used for solving differential equation on infinite domain?

Show that the fourier transform is well-defined

For which negative values of $s$ is $\delta\in W^{2,s}(\mathbb{R}^{n})$?

An inequality for mean Lebesgue norms

Showing $\sum_{j=1}^{n}\left(\frac{\partial}{\partial x_{j}}\right)^{m}$ is not elliptic for odd $m$

Equidistribution modulo $1$ of certain exponential functions

Derivatives of Fourier Coefficients Recovery Transformation

derivative of the Fourier series

Calculate Fourier series of $f(x)=x^2$ , $x \in \ [-\pi,\pi]$

Is any continuous, Lebesgue-integrable function on $\mathbb{R}^n$ vanishes at infinity?

Fourier Transform of Interval Scale Data

Calculate the convolution of $p_2(x)*u(x)$

Inverse Mellin transform of $f(s)= 2^{ \frac{s}{6} }\frac{\Gamma \left( \frac{s+1}{3/2} \right)}{ \Gamma \left( \frac{s+1}{2} \right)}$

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