Question

Error in the proof for scaling the period of a function that leads to $f(x + p) = f(x) \Rightarrow f(x + p / k) = f(x)$

score 58 · Answer 1 · 2018-03-14 10:30:31

Error in the proof for scaling the period of a function that leads to $f(x + p) = f(x) \Rightarrow f(x + p / k) = f(x)$

score 129 · Answer 2 · 2026-03-25 14:24:42

129

Views

Differentiability of the Fourier series of $(x^2-1)^2$ on [-1,1)

Published on 25 Mar 2026 - 14:24

score 2.1k · Answer 3 · 2018-03-20 13:08:33

2.1k

Views

Proof check: Prove if $f'$ is periodic, then $f$ is periodic

Published on 20 Mar 2018 - 13:08

score 197 · Answer 4 · 2026-03-22 19:28:28

197

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How do I mathematically prove $ \sin^3(3t)$ is periodic?

Published on 22 Mar 2026 - 19:28

score 4.2k · Answer 5 · 2026-03-25 14:15:31

4.2k

Views

Is the signal u[n] +u[-n] periodic?

Published on 25 Mar 2026 - 14:15

score 109 · Answer 6 · 2018-03-26 16:45:27

109

Views

Proving that continuous function $f:[0,2] \to \mathbb{R}$ such as $f(0)=f(2)$, $\exists x \in [0,1]:f(x)=f(x+1)$

Published on 26 Mar 2018 - 16:45

score 530 · Answer 7 · 2026-03-25 11:22:56

530

Views

Evaluating improper integral as infinite sum of definite integrals

Published on 25 Mar 2026 - 11:22

score 317 · Answer 8 · 2026-03-22 18:38:27

317

Views

Find the frequency of a sum of periodic functions

Published on 22 Mar 2026 - 18:38

score 960 · Answer 9 · 2026-03-23 04:47:53

960

Views

Potentials for Vector Fields on a Circle

Published on 23 Mar 2026 - 4:47

score 874 · Answer 10 · 2018-04-06 12:41:50

874

Views

Riemann-Lebesgue lemma for periodic functions

Published on 06 Apr 2018 - 12:41

score 3k · Answer 11 · 2026-03-22 09:33:12

3k

Views

Is the sum of two sine waves periodic?

Published on 22 Mar 2026 - 9:33

score 7.6k · Answer 12 · 2018-04-12 08:36:46

7.6k

Views

Why do we use trig functions in Fourier transforms, and not other periodic functions?

Published on 12 Apr 2018 - 8:36

score 370 · Answer 13 · 2026-03-25 03:06:58

370

Views

Poincaré-Bendixson criterion applied to non-autonomous dynamical systems

Published on 25 Mar 2026 - 3:06

score 153 · Answer 14 · 2018-04-15 13:16:48

153

Views

Period of $f(x-1)+f(x+1)=\sqrt{5}\cdot f(x)$.

Published on 15 Apr 2018 - 13:16

score 151 · Answer 15 · 2018-04-16 05:49:57

151

Views

How to detect or prove that this recurrence relation defines a periodic sequence?

Published on 16 Apr 2018 - 5:49

List Question

Error in the proof for scaling the period of a function that leads to $f(x + p) = f(x) \Rightarrow f(x + p / k) = f(x)$

Differentiability of the Fourier series of $(x^2-1)^2$ on [-1,1)

Proof check: Prove if $f'$ is periodic, then $f$ is periodic

How do I mathematically prove $ \sin^3(3t)$ is periodic?

Is the signal u[n] +u[-n] periodic?

Proving that continuous function $f:[0,2] \to \mathbb{R}$ such as $f(0)=f(2)$, $\exists x \in [0,1]:f(x)=f(x+1)$

Evaluating improper integral as infinite sum of definite integrals

Find the frequency of a sum of periodic functions

Potentials for Vector Fields on a Circle

Riemann-Lebesgue lemma for periodic functions

Is the sum of two sine waves periodic?

Why do we use trig functions in Fourier transforms, and not other periodic functions?

Poincaré-Bendixson criterion applied to non-autonomous dynamical systems

Period of $f(x-1)+f(x+1)=\sqrt{5}\cdot f(x)$.

How to detect or prove that this recurrence relation defines a periodic sequence?

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