40,760 reputation
1877159
bio website ellipsix.net
location Wuhan, China
age 28
visits member for 4 years, 1 month
seen 10 hours ago

I'm a postdoc doing research in high-energy particle physics. I also have a hobby interest in computer programming.

You can find me on Twitter, or check out my blog and personal website! Or you can email me at stack@ellipsix.net.

Please don't contact me through any other channel about something that should be handled through this site. If you do, I'll probably just tell you to post it here.

Any responses to moderator messages, or comments on official moderation actions here, will be ignored if sent through external channels!


1d
revised Best book for learning Quantum Communication
edited tags
2d
comment About the double orthogonality of the eigenfunctions of the Hamiltonian
@Sofia perhaps for you, the integrals need to be written in detail. For me, this answer is quite satisfactory. Of course, there's nothing wrong for requesting that an answerer show certain details; it is your question and you're certainly entitled to give answerers feedback on how well their answers address your question. My point is only that the way that you did so in your comment above is rather rude.
2d
comment About the double orthogonality of the eigenfunctions of the Hamiltonian
In any case I consider this a fairly elegant answer. (Assuming $k$ is defined and integrable over the relevant range, of course.)
2d
comment About the double orthogonality of the eigenfunctions of the Hamiltonian
@Sofia if you don't understand, you can certainly say so, and you can ask for specific points in the answer to be clarified, but it's rather presumptious (i.e. rude) to act as though you have the authority to tell people how to change their answers.
2d
revised About the double orthogonality of the eigenfunctions of the Hamiltonian
improve formatting
2d
comment About the double orthogonality of the eigenfunctions of the Hamiltonian
@Sofia in that case the question should say so. (By the way, use \to in MathJax, i.e. r\to\infty.)
2d
comment Why don't we have a theory of everything?
All of these comments (except @Qmechanic's) should have appeared in answers.
2d
revised Why don't we have a theory of everything?
fix title
2d
comment Avalance diode -looking symbols with two triangles in the case of backpressure pump?
It's off topic here, but I don't expect it to be on topic at Electrical Engineering either because it doesn't appear to be about an electronic device.
Dec
17
comment Are these Kinematics Equations Correct?
Hi Ofek, and welcome to Physics Stack Exchange! Checking equations or work for correctness is not what we do here. You can find any webpage (or textbook) that includes the basic kinematics equations and check your results against that.
Dec
14
comment What forces cause the centripetal acceleration in circular motion on a merry-go-round?
I wouldn't say bad, you just have to be careful to think about how the surfaces in contact are moving relative to each other, and what other forces (if any) are acting on them.
Dec
14
comment What forces cause the centripetal acceleration in circular motion on a merry-go-round?
OK, I've undeleted my answer. Still, you should feel free to edit the title; I don't think the title I edited in is particularly good, and you can probably do better.
Dec
14
comment What forces cause the centripetal acceleration in circular motion on a merry-go-round?
My answer addressed the question I thought you were asking when I made the edit, but since you said the new title didn't accurately reflect what you wanted to ask, I knew that I hadn't correctly understood your question. So I decided to delete my answer and wait until I figure out exactly what you are asking before (possibly) posting an answer.
Dec
14
comment What forces cause the centripetal acceleration in circular motion on a merry-go-round?
However, I would say that if you are literally just asking what forces act on a person who stands on a merry-go-round, it's not a very good question. It's easy to find that information in many other references. I strongly suspect you're asking something else, because this doesn't seem like a bad question, and a good title should probably reflect whatever it is you really do want to know.
Dec
14
comment What forces cause the centripetal acceleration in circular motion on a merry-go-round?
OK, please fix it then. I picked that title because I was trying to reconcile the two different things it seems like you're asking here: (1) what forces act on you on a merry-go-round and (2) why you move in a circle, but I wasn't really sure what you were asking so it's no surprise that I picked the wrong title.
Dec
14
answered What forces cause the centripetal acceleration in circular motion on a merry-go-round?
Dec
14
revised What forces cause the centripetal acceleration in circular motion on a merry-go-round?
edited tags; edited title
Dec
14
comment Newtons third law and unbreakability
I don't see how you get from the table breaking to assuming that Newton's third law is invalid.
Dec
14
revised Why is the potential energy for a body raised up by a height negative?
fix title, phrasing, formatting, and tags
Dec
14
comment how safe is using the remote car toy from radiation
This question appears to be off-topic because it is about safety. (Also, too old for migration by now)