Question

Hermitian adjoint for 3-vectors; should the energy-momentum 4-vector be written as $P^\mu=\left(p^0,\,p^i\right)$ or $\left(p^0,\,\vec {p}\right)$?

score 90 · Answer 1 · 2026-03-25 23:42:38

90

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Hermitian adjoint for 3-vectors; should the energy-momentum 4-vector be written as $P^\mu=\left(p^0,\,p^i\right)$ or $\left(p^0,\,\vec {p}\right)$?

Published on 25 Mar 2026 - 23:42

score 101 · Answer 2 · 2024-01-25 02:07:49

101

Views

Using index notation to prove vector identities

Published on 25 Jan 2024 - 2:07

score 115 · Answer 3 · 2026-03-26 02:51:54

115

Views

Notation for the d'Alembert operator

Published on 26 Mar 2026 - 2:51

score 193 · Answer 4 · 2026-03-25 23:16:41

193

Views

Show that $\partial_\mu\phi^\ast A^\mu\phi- A_\mu\phi^\ast\partial^\mu\phi=A^\mu\phi\partial_\mu\phi^\ast - A^\mu\phi^\ast\partial_\mu\phi$

Published on 25 Mar 2026 - 23:16

score 70 · Answer 5 · 2026-03-25 09:36:34

70

Views

Kronecker delta expressed as a derivative when there are multiple indices.

Published on 25 Mar 2026 - 9:36

score 37 · Answer 6 · 2024-03-04 10:17:52

37

Views

Changing indexing

Published on 04 Mar 2024 - 10:17

score 29 · Answer 7 · 2024-03-07 11:10:47

29

Views

Commutator formula between Hessian and Laplacian of a scalar function

Published on 07 Mar 2024 - 11:10

score 35 · Answer 8 · 2024-03-13 02:00:00

35

Views

Geometric series with indexed inequality

Published on 13 Mar 2024 - 2:00

score 191 · Answer 9 · 2024-03-18 09:22:03

191

Views

Inversion of a matrix equation

Published on 18 Mar 2024 - 9:22

score 36 · Answer 10 · 2024-03-21 14:38:25

36

Views

Inverse tensor notation

Published on 21 Mar 2024 - 14:38

score 12 · Answer 11 · 2026-02-27 03:39:52

12

Views

Terminology/notation for pulling back multi-sigma functions

Published on 27 Feb 2026 - 3:39

score 12 · Answer 12 · 2026-03-26 02:58:34

12

Views

Multi-sigma functions with unequal indices

Published on 26 Mar 2026 - 2:58

score 21 · Answer 13 · 2024-03-26 19:44:06

21

Views

Simplifying After Using the Bloch Ansatz in the Stationary Schrödinger Equation

Published on 26 Mar 2024 - 19:44

score 1k · Answer 14 · 2026-03-23 20:03:17

1k

Views

Index Notation, Moving Partial Derivative, Vector Calculus

Published on 23 Mar 2026 - 20:03

score 522 · Answer 15 · 2026-03-26 21:38:39

522

Views

Simplifying expressions and integrals with index notation

Published on 26 Mar 2026 - 21:38

List Question

Hermitian adjoint for 3-vectors; should the energy-momentum 4-vector be written as $P^\mu=\left(p^0,\,p^i\right)$ or $\left(p^0,\,\vec {p}\right)$?

Using index notation to prove vector identities

Notation for the d'Alembert operator

Show that $\partial_\mu\phi^\ast A^\mu\phi- A_\mu\phi^\ast\partial^\mu\phi=A^\mu\phi\partial_\mu\phi^\ast - A^\mu\phi^\ast\partial_\mu\phi$

Kronecker delta expressed as a derivative when there are multiple indices.

Changing indexing

Commutator formula between Hessian and Laplacian of a scalar function

Geometric series with indexed inequality

Inversion of a matrix equation

Inverse tensor notation

Terminology/notation for pulling back multi-sigma functions

Multi-sigma functions with unequal indices

Simplifying After Using the Bloch Ansatz in the Stationary Schrödinger Equation

Index Notation, Moving Partial Derivative, Vector Calculus

Simplifying expressions and integrals with index notation

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