The h Bar

7:26 AM

So.... does anybody wanna check a problem I just solved?

1 hour later…

8:29 AM

@Transmissionfrom I don't think so, but some people do it

@Transmissionfrom depends on who's speaking (and more precisely, the conventional pronunciation in the language they're speaking, but zeeno is probably the default)

@Astrum You can always post the problem and your solution here and see if anyone wants to go for it.

@DavidZ I posted it already on the main site. I tried to make it as conceptual as possible. Sorry if it's to HW like

Q: Use of Constraint Equations

Oh, you mean this one?

Let's say we have a ladder or length $L$ and height $b$ against a wall, leaning at angle $\theta$. There are two masses of mass $m$ on each end (one against the wall, and on the floor). Where $a$ is the length of the $x$ component of the ladder. In order to solve for their velocities at $t=0$, we...

yeah

um... that's not even a question, to be honest...

Well, it kind of is, if you use your imagination

I should probably rework it to really try and pindown why I always have problems with this sort of thing

8:34 AM

@Astrum lol

That may be true, but when you post on the main site you should ask something. It's really the asker's job to make it reasonably clear to others what conceptual question they have.

Yeah, sorry. I'm aware of the rules, and I myself downvote questions like my own

A rule of thumb I like is that anything posted as a question which doesn't have a question mark in it probably needs rewording.

I'll keep it in mind

so, if you could offer a quick hand, you can close it down. I don't think I'm missing something huge

Oh, you want it closed?

What I'd actually suggest is that you delete the question (which you can do yourself)

then you can think about how to edit it

(you can edit it while it's deleted AFAIK)

and when you're happy with it, just undelete it.

Alright, sounds good

doesn't look like anybody is biting, but it is 3:40AM right now

8:40 AM

yeah, another rule of thumb I have is that you should wait 24 hours before getting concerned that nobody is answering your question

asking so late at night is also a bad idea

I guess you could argue that

but people will see the question around in the morning

anyway I have to go off to sleep

see you later

alright, see ya

have a good sleep

Sam

8:54 AM

hey

Could anyone take a quick look at my question? physics.stackexchange.com/questions/88651/…

2 hours later…

11:24 AM

I'm back everyone ;-)

Looks like I need sometime to catch up with y'all :D

12:05 PM

Any mods around?

Ping @ManishEarth @Qmechanic :D

Qmechanic

@CrazyBuddy : Yes?

A: Darwin term and Zitterbewegung

@QMechanic What's up with this? physics.stackexchange.com/a/88694/8563

The Darwin term can be obtained from the low energy approximation ($|p|^2/m^2<<1$) of the Dirac equation of the electron in a central field. An elegant way to perform this task is by means of the Foldy-Wouthuysen Transformation. The same approximation leads also to the other terms detected in the...

@EmilioPisanty Weird and someone has upvoted it o_O

Qmechanic

@EmilioPisanty : Hm, the user:35094 "Emilio Pisantiny" has chosen a username that is a superpartner diminutive of your name!

12:18 PM

@Qmechanic And, got upvoted o_O :D

@Qmechanic I know. He has also plagiarized my answer and one of David Bar Moshe. I don't know what to make of their profile text either.

I can't help but interpret it as directed at me.

@EmilioPisanty Downvote & flag... (??)

@CrazyBuddy Already flagged it. I don't want to directly interact with the post, though.

Oh, fine then ;-)

@Qmechanic Thanks!

Qmechanic

12:28 PM

@EmilioPisanty : OK, deleted both answers.

12:45 PM

BTW, like I said, I tried experimenting the Mpemba effect (using home-refrigerator)

Anyone interested in speaking about that?

1:05 PM

@DavidZ: You once told (in your blog post) that you're gonna write about Mpemba effect. You can suggest something on my values :D

2 hours later…

Q: How do you show that ${\gamma^5}^\dagger = \gamma^5$?

2:49 PM

How do you show that ${\gamma^5}^\dagger = \gamma^5$, where: $$ \gamma^5 := i\gamma^0 \gamma^1 \gamma^2 \gamma^3$$ and we know that: $$ \left\{\gamma^\mu,\,\gamma^\nu\right\}=2\eta^{\mu\nu}\mathbb{1}~$$ Note: I would like to show this using only these two relations, and in particular, not using ...

homework linear-algebra

^^^ Why can't this be closed as HW? o_O

or atleast OT to math?

4 hours later…

Transmission from

6:20 PM

Whenever I google something, there doesn't seem to be an easy way (without copy-pasting) to also google scholar it. Anyone who knows how to do this?

3 hours later…

8:52 PM

@CrazyBuddy I'm getting to it. NaBloWriMo has been extended for another month because I had to do postdoc applications.

@Transmissionfrom hm, there used to be, but not anymore it seems

Transmission from

@DavidZ That's lousy. I wonder why they chose to do so.