Question

Does anyone see how I could shorten the following formula $\sum_{j=1}^n \left( \sum_{i \neq j}^n (x_i-x_j) x_i\right)^2$?

score 67 · Answer 1 · 2019-09-27 02:09:22

67

Views

Does anyone see how I could shorten the following formula $\sum_{j=1}^n \left( \sum_{i \neq j}^n (x_i-x_j) x_i\right)^2$?

Published on 27 Sep 2019 - 2:09

score 375 · Answer 2 · 2019-09-27 10:38:49

375

Views

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score 29 · Answer 3 · 2019-09-27 19:14:17

29

Views

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score 6.7k · Answer 4 · 2014-09-22 21:27:34

6.7k

Views

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score 142 · Answer 5 · 2019-10-02 16:32:20

142

Views

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score 475 · Answer 6 · 2026-03-25 07:46:46

475

Views

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score 131 · Answer 7 · 2026-03-08 09:05:22

131

Views

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score 146 · Answer 8 · 2019-10-15 09:29:00

146

Views

Do the free indices referring to the same dimension have to be denoted by the same letter on both sides of an expression when using Einstein notation?

Published on 15 Oct 2019 - 9:29

score 655 · Answer 9 · 2026-03-25 12:35:41

655

Views

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score 230 · Answer 10 · 2019-10-28 22:58:28

230

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score 101 · Answer 11 · 2026-03-24 02:40:42

101

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score 56 · Answer 12 · 2019-11-02 22:08:54

56

Views

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score 252 · Answer 13 · 2019-12-10 17:32:41

252

Views

Is it true that $A_{ij} B^i \mathbf{E}^j = A_{pq} B^q \mathbf{E}^p$? Can we move indexes in doing inner products?

Published on 10 Dec 2019 - 17:32

score 57 · Answer 14 · 2026-03-10 15:30:46

57

Views

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Published on 10 Mar 2026 - 15:30

score 33 · Answer 15 · 2026-03-25 14:20:50

33

Views

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Published on 25 Mar 2026 - 14:20

List Question

Does anyone see how I could shorten the following formula $\sum_{j=1}^n \left( \sum_{i \neq j}^n (x_i-x_j) x_i\right)^2$?

Writing improper integral and infinite sum with limit or not?

Notation Issue related to inverse function theorem

prove $\frac{1}{2}\mathbf{\nabla (u \cdot u) = u \times (\nabla \times u ) + (u \cdot \nabla)u}$ using index notation

Problem Taking a Derivative using Einstein Notation

Multiple sum variable notation

Angle Brackets on Indices

Do the free indices referring to the same dimension have to be denoted by the same letter on both sides of an expression when using Einstein notation?

Indices, Combining Sum and Product Notation

Notation: Partial derivative with two indices. What does it stand for?

Mathematical formulation for index of the smallest element in a matrix

Tensor Transformation Proof

Is it true that $A_{ij} B^i \mathbf{E}^j = A_{pq} B^q \mathbf{E}^p$? Can we move indexes in doing inner products?

Is it possible to convert output of an equation in an unordered set?

Reindexing the composition of two families of elements of a group

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