Well, I think there are two cases, one is for the upper bound I solved(corresponds to the top drum flying up); the other case is for the lower bound(it corresponds to the situation when the top drum is falling down, i.e. N_1 and N_2 are not enough to support the top drum.)
Problem:
Attempt: I tried to solve the range by listing out the newton's 2nd laws of each drum
and from the equations of the drum 2, I get
Since drum 2 must stay on the bottom drums, so it will not fly up, thus
I got the upper bound of the acceleration, but I don't know if it is...
The question:
Show that the Lorentz condition ∂µAµ =0 is expressed as d∗ A =0.
Where A is the four-potential and * is the Hodge star, d is the exterior differentiation.
In four-dimensional space, we know that the Hodge star of one-forms are the followings.
3. My attempt
Since the four...
Here is the question:
By using the equality (for boson)
---------------------------------------- (1)
Prove that
Background:
Currently I'm learning things about second quantization in the book "Advanced Quantum Mechanics"(Franz Schwabl).
Given the creation and annihilation operators(), define...