Question

Inequality $\frac{1}{n+1}+\frac{1}{n+2}+...+\frac{1}{3n+1}>1$

score 399 · Answer 1 · 2026-03-25 09:28:43

399

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Inequality $\frac{1}{n+1}+\frac{1}{n+2}+...+\frac{1}{3n+1}>1$

Published on 25 Mar 2026 - 9:28

score 317 · Answer 2 · 2018-05-15 10:37:21

317

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What is the exact value of $\sum\limits_{x=1}^∞\frac1{x^x}$?

Published on 15 May 2018 - 10:37

score 68 · Answer 3 · 2026-03-25 09:37:02

68

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where is $\sum_k(-1)^k $ going in this formula?

Published on 25 Mar 2026 - 9:37

score 196 · Answer 4 · 2026-03-26 01:29:22

196

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Sum of $1+4\epsilon +9\epsilon^2 +16\epsilon^3+...+2018^2 \epsilon^{2017}$

Published on 26 Mar 2026 - 1:29

score 96 · Answer 5 · 2018-05-15 15:53:24

96

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How to evaluate $\sum_{n=1}^{\infty} \frac{1}{a_n}$

Published on 15 May 2018 - 15:53

score 7.4k · Answer 6 · 2018-05-15 20:25:52

7.4k

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Finite sum k*x^k

Published on 15 May 2018 - 20:25

score 33 · Answer 7 · 2018-05-15 20:32:29

33

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Why can I cancel this $\sum_i 2\cos^3(\alpha_i)\sin\alpha_i$ term for pairs 180degrees apart?

Published on 15 May 2018 - 20:32

score 44 · Answer 8 · 2026-03-25 03:00:44

44

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On sums over non-symmetric sets

Published on 25 Mar 2026 - 3:00

score 50 · Answer 9 · 2026-03-28 01:26:17

50

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$\sum_{m=0}^{\infty}x^m\sum_{k=0}^{\infty}W_{m,k}f_k=\sum_{n=1}^{\infty}\frac{1}{n(n+1)}\sum_{k=0}^{\infty}\left(\frac{n+x}{n(n+1)}\right)^k f_k$?

Published on 28 Mar 2026 - 1:26

score 48 · Answer 10 · 2026-03-25 12:48:30

48

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Derivative of a Summation in Optimal Control Problem

Published on 25 Mar 2026 - 12:48

score 243 · Answer 11 · 2018-05-17 06:01:09

243

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Infinite sum of zeros approach -1

Published on 17 May 2018 - 6:01

score 49 · Answer 12 · 2026-03-25 13:54:08

49

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Need help following through the matrix calculus in this paper

Published on 25 Mar 2026 - 13:54

score 109 · Answer 13 · 2026-03-22 19:31:59

109

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If $a_i>0$ and $\sum_{i=1}^n a_i = 1$, then $\sum_{i=1}^n \frac{1}{a_i} \geq n^2$?

Published on 22 Mar 2026 - 19:31

score 1.4k · Answer 14 · 2018-05-18 01:48:26

1.4k

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Notation - Summation Over Multiple Elements in a Set

Published on 18 May 2018 - 1:48

score 163 · Answer 15 · 2026-03-27 05:38:54

163

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For $n, m \ge 0, n+m\ge 2$, evaluate $W_{m, n} =\sum_{k=1}^{\infty} \frac{1}{(k+1)^mk^{n}} $.

Published on 27 Mar 2026 - 5:38

List Question

Inequality $\frac{1}{n+1}+\frac{1}{n+2}+...+\frac{1}{3n+1}>1$

What is the exact value of $\sum\limits_{x=1}^∞\frac1{x^x}$?

where is $\sum_k(-1)^k $ going in this formula?

Sum of $1+4\epsilon +9\epsilon^2 +16\epsilon^3+...+2018^2 \epsilon^{2017}$

How to evaluate $\sum_{n=1}^{\infty} \frac{1}{a_n}$

Finite sum k*x^k

Why can I cancel this $\sum_i 2\cos^3(\alpha_i)\sin\alpha_i$ term for pairs 180degrees apart?

On sums over non-symmetric sets

$\sum_{m=0}^{\infty}x^m\sum_{k=0}^{\infty}W_{m,k}f_k=\sum_{n=1}^{\infty}\frac{1}{n(n+1)}\sum_{k=0}^{\infty}\left(\frac{n+x}{n(n+1)}\right)^k f_k$?

Derivative of a Summation in Optimal Control Problem

Infinite sum of zeros approach -1

Need help following through the matrix calculus in this paper

If $a_i>0$ and $\sum_{i=1}^n a_i = 1$, then $\sum_{i=1}^n \frac{1}{a_i} \geq n^2$?

Notation - Summation Over Multiple Elements in a Set

For $n, m \ge 0, n+m\ge 2$, evaluate $W_{m, n} =\sum_{k=1}^{\infty} \frac{1}{(k+1)^mk^{n}} $.

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