Question

Interchanging summations with complicated, nested indices

score 116 · Answer 1 · 2023-02-28 16:40:03

116

Views

Interchanging summations with complicated, nested indices

Published on 28 Feb 2023 - 16:40

score 46 · Answer 2 · 2023-03-15 08:27:24

46

Views

Simplification of multi-index notation of the dot product of a non-constant vector and the nabla operator $(a(\vec{x})\nabla )^\alpha f(\vec{x})=?$

Published on 15 Mar 2023 - 8:27

score 105 · Answer 3 · 2026-03-25 20:23:14

105

Views

Simplifying a subindex equation

Published on 25 Mar 2026 - 20:23

score 35 · Answer 4 · 2023-03-19 13:49:30

Difference between letters used as indices of arbitrary elements in a matrix/vector and letters used as indices of the last element in a matrix/vector

score 40 · Answer 5 · 2023-03-26 21:36:14

40

Views

Simplifying the product of $(x-x_j)$'s when $x_k$ has multiplicty $\geq 2$

Published on 26 Mar 2023 - 21:36

score 54 · Answer 6 · 2023-04-09 09:37:33

54

Views

Conversion of fourth-order tensor multiplication from indices notation to matrix form

Published on 09 Apr 2023 - 9:37

score 54 · Answer 7 · 2023-04-15 23:38:17

54

Views

Does $\langle x_i\rangle_{i\in I}$ refer to a function $x$ or to the image of $x$ ($x[I]$)?

Published on 15 Apr 2023 - 23:38

score 54 · Answer 8 · 2023-04-18 17:36:55

54

Views

Líenard-Weichert potential satisfies the Lorenz gauge

Published on 18 Apr 2023 - 17:36

score 96 · Answer 9 · 2023-04-20 07:02:15

96

Views

Algebraic proof for Vandermonde's identity + book recommendations for practising summation notation.

Published on 20 Apr 2023 - 7:02

score 83 · Answer 10 · 2026-03-25 23:57:56

83

Views

How to describe a multidimensional array with one index?

Published on 25 Mar 2026 - 23:57

score 42 · Answer 11 · 2023-04-26 02:41:25

42

Views

In a rigorous setting, how do I do this derivative using Ricci Calculus?

Published on 26 Apr 2023 - 2:41

score 82 · Answer 12 · 2023-04-26 12:43:24

82

Views

Problem with Einsteinian notation

Published on 26 Apr 2023 - 12:43

score 19 · Answer 13 · 2023-05-09 22:33:17

19

Views

Showing that a function is a Fourier Multiplier (Umarov)

Published on 09 May 2023 - 22:33

score 93 · Answer 14 · 2023-05-12 17:11:44

93

Views

Usage of dummy indices in a sum

Published on 12 May 2023 - 17:11

score 65 · Answer 15 · 2023-05-14 11:00:25

65

Views

Identity tensor outer product representation

Published on 14 May 2023 - 11:00

List Question

Interchanging summations with complicated, nested indices

Simplification of multi-index notation of the dot product of a non-constant vector and the nabla operator $(a(\vec{x})\nabla )^\alpha f(\vec{x})=?$

Simplifying a subindex equation

Difference between letters used as indices of arbitrary elements in a matrix/vector and letters used as indices of the last element in a matrix/vector

Simplifying the product of $(x-x_j)$'s when $x_k$ has multiplicty $\geq 2$

Conversion of fourth-order tensor multiplication from indices notation to matrix form

Does $\langle x_i\rangle_{i\in I}$ refer to a function $x$ or to the image of $x$ ($x[I]$)?

Líenard-Weichert potential satisfies the Lorenz gauge

Algebraic proof for Vandermonde's identity + book recommendations for practising summation notation.

How to describe a multidimensional array with one index?

In a rigorous setting, how do I do this derivative using Ricci Calculus?

Problem with Einsteinian notation

Showing that a function is a Fourier Multiplier (Umarov)

Usage of dummy indices in a sum

Identity tensor outer product representation

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