Question

Green function of $\left(\nabla^2+k^2\right)\!\psi=-4\pi\,\delta\!\left(\vec{r}\right)$?

score 122 · Answer 1 · 2026-04-16 08:55:41

122

Views

Green function of $\left(\nabla^2+k^2\right)\!\psi=-4\pi\,\delta\!\left(\vec{r}\right)$?

Published on 16 Apr 2026 - 8:55

score 78 · Answer 2 · 2026-04-11 10:56:32

78

Views

Is this derivative okay to perform in math (from a physics textbook)?

Published on 11 Apr 2026 - 10:56

score 60 · Answer 3 · 2026-04-12 23:44:57

60

Views

Can $f_1(x, y)-f_2(u, v)$ be written as $g(x-u, y-v)$?

Published on 12 Apr 2026 - 23:44

score 105 · Answer 4 · 2026-04-14 02:16:47

105

Views

Along what curve does a circle roll down the fastest?

Published on 14 Apr 2026 - 2:16

score 132 · Answer 5 · 2026-04-13 20:59:51

132

Views

Extreme confusion with the instanton solutions and the measure on $\mathbb{R}^4$ or $S^4$..

Published on 13 Apr 2026 - 20:59

score 58 · Answer 6 · 2026-04-15 13:19:03

58

Views

I've been asked to diagonalize a matrix A such that $A^n = MD^nM^{−1}$, where A is known and the eigenvalues of the matrix are: $e^{^+_- \pi/3}$

Published on 15 Apr 2026 - 13:19

score 37 · Answer 7 · 2026-04-08 18:24:18

37

Views

How does the SVD behave under a "phase transformation"?

Published on 08 Apr 2026 - 18:24

score 105 · Answer 8 · 2026-04-15 07:15:38

105

Views

What is the lower $n$ such that $\mathbb{CP}^4$ can be embedded in $\mathbb{R}^n$?

Published on 15 Apr 2026 - 7:15

score 106 · Answer 9 · 2026-03-25 04:36:40

106

Views

Connection between central extensions and universal covering groups for projective representations

Published on 25 Mar 2026 - 4:36

score 54 · Answer 10 · 2026-04-15 05:34:05

54

Views

Dependence of energy of solution of IVP on the initial condition

Published on 15 Apr 2026 - 5:34

score 68 · Answer 11 · 2026-04-16 03:52:45

68

Views

What is the lower $n$ such that $\mathbb{CP}^6$ can be embedded in $\mathbb{R}^n$?

Published on 16 Apr 2026 - 3:52

score 195 · Answer 12 · 2026-03-25 11:16:30

195

Views

Why is the phase space expressed in terms of the cotangent space of the configurational space?

Published on 25 Mar 2026 - 11:16

score 90 · Answer 13 · 2026-04-11 03:50:22

90

Views

Why in this linear nonhomogeneous equation, the superposition of solutions fails?

Published on 11 Apr 2026 - 3:50

score 184 · Answer 14 · 2026-04-16 14:45:13

184

Views

What is the lower $n$ such that $\mathbb{CP}^8$ can be embedded in $\mathbb{R}^n$?

Published on 16 Apr 2026 - 14:45

score 497 · Answer 15 · 2026-04-12 13:20:37

497

Views

Intersection of stable and unstable manifolds.

Published on 12 Apr 2026 - 13:20

List Question

Green function of $\left(\nabla^2+k^2\right)\!\psi=-4\pi\,\delta\!\left(\vec{r}\right)$?

Is this derivative okay to perform in math (from a physics textbook)?

Can $f_1(x, y)-f_2(u, v)$ be written as $g(x-u, y-v)$?

Along what curve does a circle roll down the fastest?

Extreme confusion with the instanton solutions and the measure on $\mathbb{R}^4$ or $S^4$..

I've been asked to diagonalize a matrix A such that $A^n = MD^nM^{−1}$, where A is known and the eigenvalues of the matrix are: $e^{^+_- \pi/3}$

How does the SVD behave under a "phase transformation"?

What is the lower $n$ such that $\mathbb{CP}^4$ can be embedded in $\mathbb{R}^n$?

Connection between central extensions and universal covering groups for projective representations

Dependence of energy of solution of IVP on the initial condition

What is the lower $n$ such that $\mathbb{CP}^6$ can be embedded in $\mathbb{R}^n$?

Why is the phase space expressed in terms of the cotangent space of the configurational space?

Why in this linear nonhomogeneous equation, the superposition of solutions fails?

What is the lower $n$ such that $\mathbb{CP}^8$ can be embedded in $\mathbb{R}^n$?

Intersection of stable and unstable manifolds.

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