Question

Trouble understanding a recursive summation

score 38 · Answer 1 · 2026-03-25 17:26:27

38

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Trouble understanding a recursive summation

Published on 25 Mar 2026 - 17:26

score 60 · Answer 2 · 2018-09-18 12:34:33

60

Views

Help to understand $\sum_{1 \leqslant k \leqslant n} \sum_{1 \leqslant j \lt k} {\frac{1}{k-j}}$

Published on 18 Sep 2018 - 12:34

score 603 · Answer 3 · 2026-03-28 01:35:29

603

Views

Fourier expansion in eigenfunctions of the Laplace operator

Published on 28 Mar 2026 - 1:35

score 65 · Answer 4 · 2026-03-25 04:10:12

65

Views

Resolving dependencies of nested dependent summations

Published on 25 Mar 2026 - 4:10

score 425 · Answer 5 · 2018-09-19 06:03:20

425

Views

Summation of simple series $\sum_{r=5}^n (2r + 4r^2) $

Published on 19 Sep 2018 - 6:03

score 25 · Answer 6 · 2026-03-25 09:23:56

25

Views

Confusion regarding summation convention

Published on 25 Mar 2026 - 9:23

score 77 · Answer 7 · 2026-03-25 03:01:14

77

Views

On a lemma by Newman relating summability and convergence

Published on 25 Mar 2026 - 3:01

score 86 · Answer 8 · 2026-03-29 10:28:58

86

Views

Notation for summation

Published on 29 Mar 2026 - 10:28

score 151 · Answer 9 · 2026-03-25 15:39:16

151

Views

An equality between a product and a combinatorial sum

Published on 25 Mar 2026 - 15:39

score 130 · Answer 10 · 2018-09-20 00:31:15

130

Views

I want to get ratio of x to y in this equation: $x + 2(x/10)^2 + 3(x/10)^3/10 + 4(x/10)^4/100 + ... + n(x/10)^n/10^{n-2} = y$

Published on 20 Sep 2018 - 0:31

score 52 · Answer 11 · 2026-03-25 19:11:42

52

Views

Is it true to write $|\sum_{i=1}^N q_i x_i|\leq \sup_i|x_i|$?

Published on 25 Mar 2026 - 19:11

score 128 · Answer 12 · 2026-03-25 17:52:08

128

Views

A general expression for the summation of series with binomial coefficients : $\sum_{k=0}^{n}(-1)^k{{n}\choose{k}} \frac{1}{k+n}$

Published on 25 Mar 2026 - 17:52

score 31 · Answer 13 · 2026-03-26 02:46:57

31

Views

Analytical convergence of an equation?

Published on 26 Mar 2026 - 2:46

score 69 · Answer 14 · 2018-09-21 09:31:22

69

Views

$\sum_{n=1}^\infty x(1-x)^{n-1}$ Does this sum converge uniformly?

Published on 21 Sep 2018 - 9:31

score 1.6k · Answer 15 · 2026-03-25 17:52:09

1.6k

Views

How to derive the closed form of the summation $\sum_{i=1}^n d (i - 1)$?

Published on 25 Mar 2026 - 17:52

List Question

Trouble understanding a recursive summation

Help to understand $\sum_{1 \leqslant k \leqslant n} \sum_{1 \leqslant j \lt k} {\frac{1}{k-j}}$

Fourier expansion in eigenfunctions of the Laplace operator

Resolving dependencies of nested dependent summations

Summation of simple series $\sum_{r=5}^n (2r + 4r^2) $

Confusion regarding summation convention

On a lemma by Newman relating summability and convergence

Notation for summation

An equality between a product and a combinatorial sum

I want to get ratio of x to y in this equation: $x + 2(x/10)^2 + 3(x/10)^3/10 + 4(x/10)^4/100 + ... + n(x/10)^n/10^{n-2} = y$

Is it true to write $|\sum_{i=1}^N q_i x_i|\leq \sup_i|x_i|$?

A general expression for the summation of series with binomial coefficients : $\sum_{k=0}^{n}(-1)^k{{n}\choose{k}} \frac{1}{k+n}$

Analytical convergence of an equation?

$\sum_{n=1}^\infty x(1-x)^{n-1}$ Does this sum converge uniformly?

How to derive the closed form of the summation $\sum_{i=1}^n d (i - 1)$?

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