Question

Can a tensor's indices be flipped arbitrarily?

score 55 · Answer 1 · 2026-02-23 12:17:40

55

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Can a tensor's indices be flipped arbitrarily?

Published on 23 Feb 2026 - 12:17

score 48 · Answer 2 · 2020-10-09 23:06:24

48

Views

How to modify index notation in a sequential matrix products $\sum_{i j k} A_{j r} B_{r k} A_{i k}$?

Published on 09 Oct 2020 - 23:06

score 177 · Answer 3 · 2020-10-12 17:55:18

177

Views

Tensor Calculus swapping out repeated indices question

Published on 12 Oct 2020 - 17:55

score 89 · Answer 4 · 2020-10-15 07:41:20

89

Views

Strange summation

Published on 15 Oct 2020 - 7:41

score 236 · Answer 5 · 2020-10-18 05:46:38

236

Views

How is this calculation showing that $\partial_{\mu}W_{\nu}$ transforms as a tensor wrong?

Published on 18 Oct 2020 - 5:46

score 393 · Answer 6 · 2020-10-20 16:39:29

393

Views

Representations of $SU(1,1)$ and its isomorphism with $SL(2,\mathbb{R})$

Published on 20 Oct 2020 - 16:39

score 35 · Answer 7 · 2020-10-21 01:36:18

35

Views

Is there a symbol for the sum of all possible 2nd order derivatives of a vector (analogous to $\nabla\cdot F(x,y)$ for 1st order derivatives)?

Published on 21 Oct 2020 - 1:36

score 61 · Answer 8 · 2020-10-28 01:00:43

61

Views

A quick question about Einstein's summation

Published on 28 Oct 2020 - 1:00

score 82 · Answer 9 · 2020-10-30 18:26:10

82

Views

Show $\lvert x^{\beta}\rvert\le \lvert x \rvert^{\lvert\beta\rvert}$, for $\beta$ a multiindex

Published on 30 Oct 2020 - 18:26

score 59 · Answer 10 · 2020-11-02 13:58:53

59

Views

How to denote a range of elements in a row array?

Published on 02 Nov 2020 - 13:58

score 306 · Answer 11 · 2020-11-09 16:56:18

306

Views

Basic question (clarification) on tensor notation of a matrix: Up-Down or Down-Down?

Published on 09 Nov 2020 - 16:56

score 1.1k · Answer 12 · 2026-03-26 14:41:58

1.1k

Views

Double summation index notation: $\Sigma_{i<j}$ versus $\Sigma_{i\neq j}$?

Published on 26 Mar 2026 - 14:41

score 34 · Answer 13 · 2020-11-11 22:08:54

34

Views

In "$\,f_w(x) = \sum_{i}\frac{1}{2}\|wx_i + c - Y\|_2^2\,$", what do the stacked "$2$"s at the end mean?

Published on 11 Nov 2020 - 22:08

score 18 · Answer 14 · 2020-12-02 17:05:04

Through which values does this sum iterate $\sum_{i_1,...,i_k = 1}^{n}D_{i_k}....D_{i_1}f(x+t\zeta)\zeta_{i_1}...\zeta_{i_k}$ mean?

score 157 · Answer 15 · 2026-03-25 16:05:20

157

Views

divergence in Einstein Summation

Published on 25 Mar 2026 - 16:05

List Question

Can a tensor's indices be flipped arbitrarily?

How to modify index notation in a sequential matrix products $\sum_{i j k} A_{j r} B_{r k} A_{i k}$?

Tensor Calculus swapping out repeated indices question

Strange summation

How is this calculation showing that $\partial_{\mu}W_{\nu}$ transforms as a tensor wrong?

Representations of $SU(1,1)$ and its isomorphism with $SL(2,\mathbb{R})$

Is there a symbol for the sum of all possible 2nd order derivatives of a vector (analogous to $\nabla\cdot F(x,y)$ for 1st order derivatives)?

A quick question about Einstein's summation

Show $\lvert x^{\beta}\rvert\le \lvert x \rvert^{\lvert\beta\rvert}$, for $\beta$ a multiindex

How to denote a range of elements in a row array?

Basic question (clarification) on tensor notation of a matrix: Up-Down or Down-Down?

Double summation index notation: $\Sigma_{i<j}$ versus $\Sigma_{i\neq j}$?

In "$\,f_w(x) = \sum_{i}\frac{1}{2}\|wx_i + c - Y\|_2^2\,$", what do the stacked "$2$"s at the end mean?

Through which values does this sum iterate $\sum_{i_1,...,i_k = 1}^{n}D_{i_k}....D_{i_1}f(x+t\zeta)\zeta_{i_1}...\zeta_{i_k}$ mean?

divergence in Einstein Summation

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