Question

On $\mathrm{\sum_{x\in\Bbb Z}sech(x)=3.142242…}$

score 255 · Answer 1 · 2026-03-25 16:12:36

255

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On $\mathrm{\sum_{x\in\Bbb Z}sech(x)=3.142242…}$

Published on 25 Mar 2026 - 16:12

score 148 · Answer 2 · 2026-02-23 07:48:07

148

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Why can't $a=\theta-\sin(\theta)$ be solved for $\theta$ in terms of $a$ in closed form?

Published on 23 Feb 2026 - 7:48

score 110 · Answer 3 · 2026-04-11 21:57:59

110

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Solve two term recurrence relation

Published on 11 Apr 2026 - 21:57

score 235 · Answer 4 · 2021-08-01 01:22:11

235

Views

Find closed form of $a_{n+1} = 4a_n - 2$

Published on 01 Aug 2021 - 1:22

score 374 · Answer 5 · 2026-04-12 04:30:13

374

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Does $\mathrm{\int W(ln(x))dx}$ have a closed form?

Published on 12 Apr 2026 - 4:30

score 61 · Answer 6 · 2026-04-11 22:41:32

61

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Can I get an explicit function of n in this situation?

Published on 11 Apr 2026 - 22:41

score 223 · Answer 7 · 2026-04-03 04:53:17

223

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Conjecture:$\int_{0}^{\infty} \frac{\sin^3(x)\sin(3\pi x)}{x^4} J_0(x)^2\text{d}x \overset{?}{=} \frac{\pi}{2}$

Published on 03 Apr 2026 - 4:53

score 83 · Answer 8 · 2026-04-12 01:05:19

83

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Can we get closed-form solutions for this optimization problem?

Published on 12 Apr 2026 - 1:05

score 83 · Answer 9 · 2021-08-05 19:02:38

83

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How was the closed form of $\sum_{j=i+1}^{n}(n-i-j+2)$ calculated?

Published on 05 Aug 2021 - 19:02

score 223 · Answer 10 · 2026-03-27 02:02:42

223

Views

Does $\sum_{n=1}^\infty \frac{1}{nH_n^2}$ (& related) have any closed form representaions?

Published on 27 Mar 2026 - 2:02

score 121 · Answer 11 · 2026-03-25 07:15:32

121

Views

Question related to potential closed-form representation of Catalan's constant

Published on 25 Mar 2026 - 7:15

score 836 · Answer 12 · 2026-04-10 05:30:01

836

Views

How do we know if a function has an elementary inverse?

Published on 10 Apr 2026 - 5:30

score 217 · Answer 13 · 2021-08-13 02:06:59

217

Views

A simple general expression for a definite integral

Published on 13 Aug 2021 - 2:06

score 81 · Answer 14 · 2026-04-05 18:41:30

81

Views

Find the sum and asymptotic expansion of $\sum_{u=1}^{[N/2]} \sum_{v=1}^{[\sqrt{N}]} \left[{|u^2-2v| \le N}\right] \left[{|-2uv| \le N}\right]$

Published on 05 Apr 2026 - 18:41

score 59 · Answer 15 · 2021-08-18 02:12:37

If we have an infinite intersection $\bigcap_{\text{distinct } a,b,c \in X} (M_a \cup M_b \cup M_c)$, then how can we compute that as a union?

List Question

On $\mathrm{\sum_{x\in\Bbb Z}sech(x)=3.142242…}$

Why can't $a=\theta-\sin(\theta)$ be solved for $\theta$ in terms of $a$ in closed form?

Solve two term recurrence relation

Find closed form of $a_{n+1} = 4a_n - 2$

Does $\mathrm{\int W(ln(x))dx}$ have a closed form?

Can I get an explicit function of n in this situation?

Conjecture:$\int_{0}^{\infty} \frac{\sin^3(x)\sin(3\pi x)}{x^4} J_0(x)^2\text{d}x \overset{?}{=} \frac{\pi}{2}$

Can we get closed-form solutions for this optimization problem?

How was the closed form of $\sum_{j=i+1}^{n}(n-i-j+2)$ calculated?

Does $\sum_{n=1}^\infty \frac{1}{nH_n^2}$ (& related) have any closed form representaions?

Question related to potential closed-form representation of Catalan's constant

How do we know if a function has an elementary inverse?

A simple general expression for a definite integral

Find the sum and asymptotic expansion of $\sum_{u=1}^{[N/2]} \sum_{v=1}^{[\sqrt{N}]} \left[{|u^2-2v| \le N}\right] \left[{|-2uv| \le N}\right]$

If we have an infinite intersection $\bigcap_{\text{distinct } a,b,c \in X} (M_a \cup M_b \cup M_c)$, then how can we compute that as a union?

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