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Student.


Jan
14
comment two identical point charges can't collide
@uncookedfalcon Yes, but if you don't like that frame, you can replace $\mathbf{r}$ everywhere by $\mathbf q_1-\mathbf q_2$. The same analysis caries over to this "more general" frame. Regarding your question, both frames are inertial (because setting the force to zero, you get a particle that follows a stright line with constant velocity as the solution to the differential equation). Does that answer your question about frames?
Jan
13
comment two identical point charges can't collide
@uncookedfalcon if you wish to analyze the problem in arbitrary dimension, the field is no longer inverse-square dependent.
Jan
13
revised two identical point charges can't collide
added 196 characters in body
Jan
13
answered two identical point charges can't collide
Jan
13
comment two identical point charges can't collide
If your law is to have physical meaning, it must be $n=3$ and in Newton+Coulomb law it's not the norm squared, but to the third power.
Jan
12
comment Metric tensor of complex numbers & Hamiltonian Mechanics
I've found it. It's "Introduction to Mechanics and Symmetry" by Marsden and Ratiu, Exercise 2.1-1.
Jan
11
comment Metric tensor of complex numbers & Hamiltonian Mechanics
the $2$ factor comes from the definition of the partial with respect to $\bar{z}$. // These equations are $N$ complex equations, so $2N$ real eqs. I think I saw that once on one of Marsden's books. Let me search...
Jan
11
revised Metric tensor of complex numbers & Hamiltonian Mechanics
added info
Jan
11
comment Metric tensor of complex numbers & Hamiltonian Mechanics
Ah, I see. But curvature has double derivatives of the metric tensor. In this case $\eta$ is the metric tensor on the nose :) en.wikipedia.org/wiki/Riemann_curvature_tensor
Jan
11
comment Metric tensor of complex numbers & Hamiltonian Mechanics
@AimForClarity I'm not sure I understand why you write "curvature" for $\eta$. I do not understand that part of the question.
Jan
11
revised Metric tensor of complex numbers & Hamiltonian Mechanics
added 21 characters in body
Jan
11
answered Metric tensor of complex numbers & Hamiltonian Mechanics
Jan
11
answered Definition for Covariant Derivative
Jan
5
revised Earth-Sun distance equation
corrected spelling
Jan
5
suggested suggested edit on Earth-Sun distance equation
Jan
5
revised Earth-Sun distance equation
spelling correction
Jan
5
suggested suggested edit on Earth-Sun distance equation
Jan
5
comment Earth-Sun distance equation
@kEoz meta.stackexchange.com/questions/5234/…
Jan
1
comment 8 periodicity: Clifford clock- Bott periodicity - KO-dimension in noncommutative geometries
Very rich answer indeed! I appreciate specially the reference to Landsman's notes, which I didn't knew.
Jan
1
revised Trouble simplifying a tough equation
edited body