Question

Fourier sine series of cosine?

score 288 · Answer 1 · 2026-04-09 11:28:47

288

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Fourier sine series of cosine?

Published on 09 Apr 2026 - 11:28

score 444 · Answer 2 · 2026-04-16 14:43:54

444

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Proving $\sum_{n =1,3,5..}^{\infty }\frac{4k \ \sin^2\left(\frac{n}{k}\right)}{n^2}=\pi$

Published on 16 Apr 2026 - 14:43

score 125 · Answer 3 · 2026-04-14 07:31:45

125

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2-Dimensional FOURIER TRANSFORM

Published on 14 Apr 2026 - 7:31

score 58 · Answer 4 · 2026-04-16 22:42:36

58

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Prove that for $f:A \to [0,\infty)$ if $\sum\limits_{a\in\mathbb A} f(a) < \infty$ then $\{a \in A\mid f(a) \neq0\}$ is at most countable.

Published on 16 Apr 2026 - 22:42

score 124 · Answer 5 · 2026-04-15 16:20:25

124

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sum of geometric series $\sum_{j=-N}^N e^{i \cdot j \cdot ξ \cdot λ}=\sin(N+{1\over 2}) \cdot (ξ \cdotλ)\over \sin({ξ \cdot λ \over 2})$

Published on 15 Apr 2026 - 16:20

score 83 · Answer 6 · 2026-04-17 12:35:28

83

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Taylor series of $r:x \mapsto \begin{cases} e^{-{1\over x}}, & \text{if $x>0$} \\ 0, & \text{if $x \le 0$}\end{cases}$ at $0$

Published on 17 Apr 2026 - 12:35

score 48 · Answer 7 · 2026-04-16 07:49:10

48

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What is the simplest way to extract a rough orientation statistics from images

Published on 16 Apr 2026 - 7:49

score 122 · Answer 8 · 2026-04-10 18:26:54

122

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Solution to the heat equation using a finite difference scheme

Published on 10 Apr 2026 - 18:26

score 480 · Answer 9 · 2026-04-09 12:29:49

480

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Fourier transform of integral function

Published on 09 Apr 2026 - 12:29

score 491 · Answer 10 · 2026-04-10 09:59:44

491

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two-dimensional wave equation

Published on 10 Apr 2026 - 9:59

score 244 · Answer 11 · 2026-04-11 22:10:04

244

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What's amiss in this Fourier convergence analysis?

Published on 11 Apr 2026 - 22:10

score 237 · Answer 12 · 2026-04-11 19:34:34

237

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Fourier transform of a certain equality / discrete time Fourier transform of Dirac delta?

Published on 11 Apr 2026 - 19:34

score 890 · Answer 13 · 2026-04-11 16:48:28

890

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how to find out how many Fourier coefficients there are (which are not zeros)

Published on 11 Apr 2026 - 16:48

score 490 · Answer 14 · 2026-04-16 13:45:40

490

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How is the fourier series of $\frac{\pi-x}2$ derived?

Published on 16 Apr 2026 - 13:45

score 106 · Answer 15 · 2026-04-15 01:36:22

106

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Computing the series of log and sine

Published on 15 Apr 2026 - 1:36

List Question

Fourier sine series of cosine?

Proving $\sum_{n =1,3,5..}^{\infty }\frac{4k \ \sin^2\left(\frac{n}{k}\right)}{n^2}=\pi$

2-Dimensional FOURIER TRANSFORM

Prove that for $f:A \to [0,\infty)$ if $\sum\limits_{a\in\mathbb A} f(a) < \infty$ then $\{a \in A\mid f(a) \neq0\}$ is at most countable.

sum of geometric series $\sum_{j=-N}^N e^{i \cdot j \cdot ξ \cdot λ}=\sin(N+{1\over 2}) \cdot (ξ \cdotλ)\over \sin({ξ \cdot λ \over 2})$

Taylor series of $r:x \mapsto \begin{cases} e^{-{1\over x}}, & \text{if $x>0$} \\ 0, & \text{if $x \le 0$}\end{cases}$ at $0$

What is the simplest way to extract a rough orientation statistics from images

Solution to the heat equation using a finite difference scheme

Fourier transform of integral function

two-dimensional wave equation

What's amiss in this Fourier convergence analysis?

Fourier transform of a certain equality / discrete time Fourier transform of Dirac delta?

how to find out how many Fourier coefficients there are (which are not zeros)

How is the fourier series of $\frac{\pi-x}2$ derived?

Computing the series of log and sine

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