Question

How do I solve this recursive equation which involves square root?

score 114 · Answer 1 · 2026-04-09 04:59:47

114

Views

How do I solve this recursive equation which involves square root?

Published on 09 Apr 2026 - 4:59

score 425 · Answer 2 · 2026-04-15 01:34:33

425

Views

Finding $\sum_{r=1}^{\infty}\left(\frac{2r+5}{r^2+r}\right)\left(\frac{3}{5}\right)^{r+1}$

Published on 15 Apr 2026 - 1:34

score 110 · Answer 3 · 2026-05-14 12:36:15

110

Views

Convergence/divergence of $\sum_{n=1}^{\infty} \frac{{(-1)}^n \tan{(n)}}{n^2}$

Published on 14 May 2026 - 12:36

score 351 · Answer 4 · 2026-04-23 16:55:52

351

Views

When is the sum of a quasi-convex function and a convex function quasi-convex?

Published on 23 Apr 2026 - 16:55

score 255 · Answer 5 · 2026-04-15 09:02:15

255

Views

Minimize and maximize the product of the sum of an nCk combination of an array, with the sum of the remaining items

Published on 15 Apr 2026 - 9:02

score 186 · Answer 6 · 2026-04-16 03:35:37

186

Views

Beautiful closed form of $\sum_{k=0}^{\infty}\frac{(-1)^{k+1}}{2(k+1)^2}\int_0^1\ln (k+1-k^x)+2\ln (1+k^x)dx$

Published on 16 Apr 2026 - 3:35

score 34 · Answer 7 · 2026-04-12 00:36:44

34

Views

Problem with summation by method of difference

Published on 12 Apr 2026 - 0:36

score 177 · Answer 8 · 2026-04-15 12:07:48

177

Views

Show that $\sum_{k=1}^\infty \frac{i}{k(k+1)}$ converges. Find its sum.

Published on 15 Apr 2026 - 12:07

score 75 · Answer 9 · 2026-04-15 13:40:38

75

Views

$\sum_{k=0} ^\infty (-1)^k \frac{(2k)!!}{(2k+1)!!} a^{2k+1}$ to differential equation

Published on 15 Apr 2026 - 13:40

score 16 · Answer 10 · 2026-04-24 18:02:21

16

Views

$\sum_{k=0} ^\infty (-1)^k \frac{(2k)!!}{(2k+1)!!} a^{2k+1}$ derivative relation

Published on 24 Apr 2026 - 18:02

score 21 · Answer 11 · 2026-04-10 20:45:01

21

Views

How can I express a sum of n variables where the output is bounded between two scalars?

Published on 10 Apr 2026 - 20:45

score 246 · Answer 12 · 2026-04-13 21:02:16

246

Views

Infinite sum of $\sum_{n=1}^\infty \sin^{2n}\left(\frac{\pi}{n}\right)$

Published on 13 Apr 2026 - 21:02

score 57 · Answer 13 · 2026-04-13 16:30:24

57

Views

Sigma Notation Equation?

Published on 13 Apr 2026 - 16:30

score 109 · Answer 14 · 2026-05-11 07:46:56

109

Views

Is the inequality true for all $n\geq 2$?

Published on 11 May 2026 - 7:46

score 60 · Answer 15 · 2026-04-11 08:26:45

60

Views

Double summation transition from Vandermonde's identity

Published on 11 Apr 2026 - 8:26

List Question

How do I solve this recursive equation which involves square root?

Finding $\sum_{r=1}^{\infty}\left(\frac{2r+5}{r^2+r}\right)\left(\frac{3}{5}\right)^{r+1}$

Convergence/divergence of $\sum_{n=1}^{\infty} \frac{{(-1)}^n \tan{(n)}}{n^2}$

When is the sum of a quasi-convex function and a convex function quasi-convex?

Minimize and maximize the product of the sum of an nCk combination of an array, with the sum of the remaining items

Beautiful closed form of $\sum_{k=0}^{\infty}\frac{(-1)^{k+1}}{2(k+1)^2}\int_0^1\ln (k+1-k^x)+2\ln (1+k^x)dx$

Problem with summation by method of difference

Show that $\sum_{k=1}^\infty \frac{i}{k(k+1)}$ converges. Find its sum.

$\sum_{k=0} ^\infty (-1)^k \frac{(2k)!!}{(2k+1)!!} a^{2k+1}$ to differential equation

$\sum_{k=0} ^\infty (-1)^k \frac{(2k)!!}{(2k+1)!!} a^{2k+1}$ derivative relation

How can I express a sum of n variables where the output is bounded between two scalars?

Infinite sum of $\sum_{n=1}^\infty \sin^{2n}\left(\frac{\pi}{n}\right)$

Sigma Notation Equation?

Is the inequality true for all $n\geq 2$?

Double summation transition from Vandermonde's identity

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