Question

Mathematical formalism for the "dot product" of three vectors

score 525 · Answer 1 · 2015-08-19 19:06:33

525

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Mathematical formalism for the "dot product" of three vectors

Published on 19 Aug 2015 - 19:06

score 74 · Answer 2 · 2015-08-21 12:11:10

74

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Is the value of $c$ in $\prod_{i=1}^{n}\frac{p_i}{p_i-1}<e^c \cdot (\log p_n) \cdot(1+\frac{1}{\log_2p_n})$ known?

Published on 21 Aug 2015 - 12:11

score 4.9k · Answer 3 · 2015-09-03 12:33:14

4.9k

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Conversion from sum of product to product of sum

Published on 03 Sep 2015 - 12:33

score 224 · Answer 4 · 2015-09-04 18:53:42

224

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Prove that a given expression is always an integer

Published on 04 Sep 2015 - 18:53

score 266 · Answer 5 · 2015-09-04 21:54:58

266

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Is there a closed form product of $\cos(kx)$?

Published on 04 Sep 2015 - 21:54

score 65 · Answer 6 · 2015-09-05 12:15:01

65

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Solving for $n$ in this equation

Published on 05 Sep 2015 - 12:15

score 93 · Answer 7 · 2026-03-25 10:57:16

93

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Is this infinite product for zeta(2) trivial?

Published on 25 Mar 2026 - 10:57

score 139 · Answer 8 · 2015-09-09 14:52:34

139

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Integrating $\int_{0}^{\infty}\prod_{k=1}^{n}(kx-1)e^{-ax} {d}x,$ where $a$ and $n$ are parameters.

Published on 09 Sep 2015 - 14:52

score 39 · Answer 9 · 2015-09-09 16:40:02

39

Views

Equation with cos and product

Published on 09 Sep 2015 - 16:40

score 465 · Answer 10 · 2026-03-26 13:51:39

465

Views

Average weighted by inverse distance to median equal to median?

Published on 26 Mar 2026 - 13:51

score 171 · Answer 11 · 2015-09-10 12:33:41

171

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How is $0\cdot\infty= -1$?

Published on 10 Sep 2015 - 12:33

score 58.1k · Answer 12 · 2015-09-13 04:10:14

58.1k

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Can we express sum of products as product of sums?

Published on 13 Sep 2015 - 4:10

score 239 · Answer 13 · 2026-03-30 08:30:08

239

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Why $(\mathbb Q\times\mathbb Q)/(\mathbb Z\times{=})$ is not homeomorphic to $(\mathbb Q/\mathbb Z)\times(\mathbb Q/{=})$?

Published on 30 Mar 2026 - 8:30

score 71 · Answer 14 · 2015-09-17 01:26:07

71

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$(C \times D) \cap (A \times B) \neq \emptyset \implies C \cap A \neq \emptyset$ and $D \cap B \neq \emptyset$

Published on 17 Sep 2015 - 1:26

score 118 · Answer 15 · 2015-09-20 23:28:31

118

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For $n \in \mathbb{N}$, find and prove a formula for $\sum_{i=1}^n \frac{1}{i(i+1)}$, plus related question.

Published on 20 Sep 2015 - 23:28

List Question

Mathematical formalism for the "dot product" of three vectors

Is the value of $c$ in $\prod_{i=1}^{n}\frac{p_i}{p_i-1}<e^c \cdot (\log p_n) \cdot(1+\frac{1}{\log_2p_n})$ known?

Conversion from sum of product to product of sum

Prove that a given expression is always an integer

Is there a closed form product of $\cos(kx)$?

Solving for $n$ in this equation

Is this infinite product for zeta(2) trivial?

Integrating $\int_{0}^{\infty}\prod_{k=1}^{n}(kx-1)e^{-ax} {d}x,$ where $a$ and $n$ are parameters.

Equation with cos and product

Average weighted by inverse distance to median equal to median?

How is $0\cdot\infty= -1$?

Can we express sum of products as product of sums?

Why $(\mathbb Q\times\mathbb Q)/(\mathbb Z\times{=})$ is not homeomorphic to $(\mathbb Q/\mathbb Z)\times(\mathbb Q/{=})$?

$(C \times D) \cap (A \times B) \neq \emptyset \implies C \cap A \neq \emptyset$ and $D \cap B \neq \emptyset$

For $n \in \mathbb{N}$, find and prove a formula for $\sum_{i=1}^n \frac{1}{i(i+1)}$, plus related question.

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