« first day (4247 days earlier)      last day (682 days later) » 

eigenvalue
eigenvalue
1:15 AM
Does anyone here know how to pick a smooth timelike vector field, given the following metric $g=-\cos(2\varphi)(dt)^{2}+2\sin(2\varphi)dtdx+\cos(2\varphi)(dx)^{2}$ ?
 
 
5 hours later…
Slereah
Slereah
6:37 AM
solve the equation $g(X, X) = -1$?
 
 
3 hours later…
Slereah
Slereah
9:21 AM
I like how in gauge gravity, there is a bundle called the fake tangent bundle
 
 
4 hours later…
Slereah
Slereah
1:37 PM
It is essentially just $$FM \times_H \mathbb{R}^N$$
or something similar
 
More Anonymous
More Anonymous
2:07 PM
So I bountied a question and the value is negative but its suppose to represent: This is the sum, over all particles in a unit 3-volume, of the inverse energy
How the heck does the integral end up being negative?
 
 
3 hours later…
Jack Rod
Jack Rod
5:07 PM
hi everyone actually I have been looking for a good book on quantum measurment
can anyone help in this struggle
 
 
1 hour later…
glS
glS
6:14 PM
@JackRod what do you mean precisely with "quantum measurement" here?
or better said, what about "quantum measurement" you think is not sufficiently covered in the standard basic introductions to QM?
 
eigenvalue
eigenvalue
6:47 PM
@siereah … I remember there was a way to pick such a vector field via eigenvectors.. but I guess, just solving the equation would be indeed a valid approach too. Thanks for reminding me of this option! :-)
 
Samyak Marathe
Samyak Marathe
Hi
Is anyone up?
I want help in a little doubt
 
 
4 hours later…
rob
rob
11:14 PM
-2
Q: Out running a bear

LukeI was going to ask this in wilderness but I’m pretty sure we’ll need some math to find out the real answer. They say you can’t out run a grizzly bear because they run about 35 mph. While the average human runs 6-18 mph. I’m assuming we are simple steaks running in a straight line race. But seeing...

mathematics
I'm not going to make the one-character edit, but this question about being eaten by a bear has a missing "r" in the assumption that the runner is "a streak."
 

« first day (4247 days earlier)      last day (682 days later) »