Question

Proof that $\|\vec{x} \odot \vec{y}\| \leq \|\vec{x}\|\|\vec{y}\|$

score 113 · Answer 1 · 2026-03-26 16:26:48

113

Views

Proof that $\|\vec{x} \odot \vec{y}\| \leq \|\vec{x}\|\|\vec{y}\|$

Published on 26 Mar 2026 - 16:26

score 86 · Answer 2 · 2021-07-26 20:34:54

86

Views

Double product of $2^i\cdot 3^j$

Published on 26 Jul 2021 - 20:34

score 83 · Answer 3 · 2021-07-28 17:06:53

83

Views

Calculate the limit $\lim_{n\rightarrow\infty}\left(\frac{\prod_1^n(1 +r/n^2)}{e^{1/2}}\right)^n$

Published on 28 Jul 2021 - 17:06

score 198 · Answer 4 · 2021-07-31 21:48:30

198

Views

Notation for expressing a product over combinations of indices in expansion of $\prod^m_{n=1} (1 + a_n)$?

Published on 31 Jul 2021 - 21:48

score 152 · Answer 5 · 2021-08-05 15:16:41

152

Views

Product symbol notation for whole set

Published on 05 Aug 2021 - 15:16

score 74 · Answer 6 · 2021-08-06 17:15:52

74

Views

Solve inequality involving product of x terms

Published on 06 Aug 2021 - 17:15

score 63 · Answer 7 · 2021-08-17 12:45:02

63

Views

When is $M^Tv\neq 0$ for every $v$ satisfying $v\neq 0$?

Published on 17 Aug 2021 - 12:45

score 87 · Answer 8 · 2026-03-29 03:53:23

87

Views

How to realize the product of block matrices in MATLAB

Published on 29 Mar 2026 - 3:53

score 1k · Answer 9 · 2026-04-02 10:04:19

1k

Views

What is $\mathcal{R}$?

Published on 02 Apr 2026 - 10:04

score 40 · Answer 10 · 2021-09-07 09:01:49

40

Views

Lower bound on $\prod_{n=1}^{N} (1 + a_n)$ when $|a_n| = O(1/n)$

Published on 07 Sep 2021 - 9:01

score 299 · Answer 11 · 2021-09-12 07:01:28

299

Views

How to prove that $\cos n \phi - \cos n \theta = 2^{n-1}\prod_{k=0}^{n-1}\left(\cos \phi - \cos\left(\theta - \frac{2k\pi}{n}\right)\right)$

Published on 12 Sep 2021 - 7:01

score 87 · Answer 12 · 2021-09-15 11:04:29

87

Views

$\sum_{i = 0}^{K - 1} {[\frac{1}{i + 1}\prod_{j=i+2}^{K}{(1 - \frac{1}{jq})}]} = q$

Published on 15 Sep 2021 - 11:04

score 75 · Answer 13 · 2021-09-15 23:56:08

75

Views

Is this identity known and if so, does it have a name?

Published on 15 Sep 2021 - 23:56

score 143 · Answer 14 · 2026-03-30 01:48:02

143

Views

How to show this identity $\prod_{q=1}^k\frac{1}{1-qz}=\sum_{j=1}^{k}jz\prod_{q=1}^j\frac{1}{1-qz}+1$ avoiding a proof by induction

Published on 30 Mar 2026 - 1:48

score 79 · Answer 15 · 2021-09-20 13:08:44

79

Views

About the ideal of a closed subscheme

Published on 20 Sep 2021 - 13:08

List Question

Proof that $\|\vec{x} \odot \vec{y}\| \leq \|\vec{x}\|\|\vec{y}\|$

Double product of $2^i\cdot 3^j$

Calculate the limit $\lim_{n\rightarrow\infty}\left(\frac{\prod_1^n(1 +r/n^2)}{e^{1/2}}\right)^n$

Notation for expressing a product over combinations of indices in expansion of $\prod^m_{n=1} (1 + a_n)$?

Product symbol notation for whole set

Solve inequality involving product of x terms

When is $M^Tv\neq 0$ for every $v$ satisfying $v\neq 0$?

How to realize the product of block matrices in MATLAB

What is $\mathcal{R}$?

Lower bound on $\prod_{n=1}^{N} (1 + a_n)$ when $|a_n| = O(1/n)$

How to prove that $\cos n \phi - \cos n \theta = 2^{n-1}\prod_{k=0}^{n-1}\left(\cos \phi - \cos\left(\theta - \frac{2k\pi}{n}\right)\right)$

$\sum_{i = 0}^{K - 1} {[\frac{1}{i + 1}\prod_{j=i+2}^{K}{(1 - \frac{1}{jq})}]} = q$

Is this identity known and if so, does it have a name?

How to show this identity $\prod_{q=1}^k\frac{1}{1-qz}=\sum_{j=1}^{k}jz\prod_{q=1}^j\frac{1}{1-qz}+1$ avoiding a proof by induction

About the ideal of a closed subscheme

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