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 69 · Answer 1 · 2026-04-15 11:55:37

69

Views

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

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score 378 · Answer 2 · 2026-04-12 22:58:48

378

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32

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6.7k

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score 144 · Answer 5 · 2026-04-26 01:14:15

144

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478

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score 132 · Answer 7 · 2026-05-07 09:02:49

132

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score 149 · Answer 8 · 2026-04-21 04:30:32

149

Views

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659

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233

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score 118 · Answer 11 · 2026-04-26 12:02:30

118

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score 58 · Answer 12 · 2026-04-28 21:03:40

58

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score 256 · Answer 13 · 2026-05-02 12:01:36

256

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?

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score 61 · Answer 14 · 2026-05-07 12:28:30

61

Views

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score 49 · Answer 15 · 2026-04-25 03:14:15

49

Views

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Published on 25 Apr 2026 - 3:14

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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