List questions from mathematical-physics

Published on 27 Mar 2026 - 7:36

60

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Assistance in deriving the trigonometric expression:

Published on 28 Mar 2026 - 14:25

42

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Union of Percolations

Published on 25 Mar 2026 - 1:29

26

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Deriving an expression for the wave operator acting on the gravitational spinor: $\square \Psi_{ABCD} = 6\Psi_{EF(AB} \Psi_{CD)}{}^{EF}$

Published on 26 Mar 2026 - 16:05

24

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Can a second-order expansion without the linear term be meaningful to estimate out-of-equilibrium oscillations?

Published on 30 Mar 2026 - 11:17

106

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What is a variation, and what does it mean for it to be differentiable?

Published on 01 Apr 2026 - 16:01

63

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System of equations with sin and cos being multiplied?

Published on 13 Jul 2023 - 13:10

125

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ADHM construction: why two bundles of the monad have the same ranks?

Published on 25 Mar 2026 - 12:54

60

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Theory for "Correct" discretization of Laplacian on R

Published on 15 Jul 2023 - 2:50

84

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Chapter I of Gelfand and Fomin's Calculus on Variations: a couple of questions

Published on 01 Apr 2026 - 17:38

533

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What is ⨋ (U+2A0B: summation with integral) used for?

Published on 20 Jul 2023 - 14:46

61

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Non-homogeneous wave equation, retarded potentials and causality

Published on 25 Mar 2026 - 20:08

157

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How can you use the Levi-Civita symbol (index notation) to derive an expression for $(\hat{r}\times\nabla)\cdot(\hat{r} \times\nabla)$?

Published on 30 Mar 2026 - 11:20

46

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Understanding a passage describing the state and phase space of a classical particle

Published on 25 Mar 2026 - 9:27

41

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Potential from a vector field, and why the naive approach doesn't seem to work?

Published on 24 Jul 2023 - 2:59

List Question

Trace of Lax operator for the Gaudin model

Assistance in deriving the trigonometric expression:

Union of Percolations

Deriving an expression for the wave operator acting on the gravitational spinor: $\square \Psi_{ABCD} = 6\Psi_{EF(AB} \Psi_{CD)}{}^{EF}$

Can a second-order expansion without the linear term be meaningful to estimate out-of-equilibrium oscillations?

What is a variation, and what does it mean for it to be differentiable?

System of equations with sin and cos being multiplied?

ADHM construction: why two bundles of the monad have the same ranks?

Theory for "Correct" discretization of Laplacian on R

Chapter I of Gelfand and Fomin's Calculus on Variations: a couple of questions

What is ⨋ (U+2A0B: summation with integral) used for?

Non-homogeneous wave equation, retarded potentials and causality

How can you use the Levi-Civita symbol (index notation) to derive an expression for $(\hat{r}\times\nabla)\cdot(\hat{r} \times\nabla)$?

Understanding a passage describing the state and phase space of a classical particle

Potential from a vector field, and why the naive approach doesn't seem to work?

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