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user54412
3:01 PM
@user1504 I've gone through enough "QFT" books to know how to evaluate any Feynman diagram out there, but I'd be interested to hear your take on what's a good book to understand the physics (as opposed to the symbol manipulation)
 
So... finally, the programming stuff has disappeared..!
 
@CrazyBuddy boo
 
Yuck..!
 
user54412
@CrazyBuddy do you prefer sed, awk, or perl for doing regex substitutions in text files?
 
user54412
:P:P
 
3:04 PM
sed, because I don't know awk :P
 
Whole crap... started again -_-
 
@ChrisWhite I know zilch about quantum mechanics, never mind QFT, but I loved the look of the first few chapters in Weinberg's book that delved into its historical construction. Some authors just have that air of authority about them, others as, plagiarists
 
@ChrisWhite: That's a much more difficult question. :)
 
@CrazyBuddy This time it's your fault!
 
3:06 PM
I've come around to the view that students should begin with lattice QFT.
Starting this way forces you to grapple with the ideas of effective field theory immediately.
 
Given the new theme of the room, I shall temporarily rename it
room topic changed to The h FooBar: General chat for Physics Stack Exchange (physics.stackexchange.com) (no tags)
:P
 
So, who gave this name Foobar ??? :D
 
room topic changed to The h Bar: General chat for Physics Stack Exchange (physics.stackexchange.com) (no tags)
meh, not as catchy
@CrazyBuddy In programming books when you want to use a filler variable name you use foo, then bar, then baz, then quok
The terms foobar , fubar, or foo, bar, baz and qux (alternatively quux) are sometimes used as placeholder names (also referred to as metasyntactic variables) in computer programming or computer-related documentation. They have been used to name entities such as variables, functions, and commands whose purpose is unimportant and serve only to demonstrate a concept. The words themselves have no meaning in this usage. Foobar is sometimes used alone; foo, bar, and baz are sometimes used in that order, when multiple entities are needed. The usage in computer programming examples and pseud...
 
Ohh...
 
user54412
@LarryHarson Admittedly I haven't looked at Weinberg's QFT - I'm somewhat afraid though because his Cosmology is unnecessarily complicated IMO
 
3:10 PM
For particular textbooks: I like Smit's "Introduction to Quantum Fields on a Lattice" and Montvay & Munster's "Quantum Fields on a Lattice"
 
user54412
@user1504 Thanks - I'll take a look at those
 
You should exercise caution, as you apparently like to program, and lattice QFT is rather seductive.
I should say that neither of those textbooks is fully satisfactory.
 
I'd like to learn QFT, but I first need to get my QM straight
 
Okay... Back again... So, today we've assembled here as if we're gonna discuss about closing questions :D
Really..? Are we? :P
 
user54412
Isn't that not for another 47 minutes? ;)
 
3:13 PM
in an hour, yes
 
The lattice QFT books are still mainly concerned with computation, so they don't spend much time worrying about exatctly what a QFT is.
 
Until then we'll focus on discussing things that anno @CrazyBuddy :P
 
But they are better than the perturbative QFT particle physics books.
 
user54412
well, it might be nice to get my hands dirty with some computation
 
I don't like computations that take more than 10 seconds
 
3:14 PM
The nicest thing I've seen about definitions in QFT is Hollands & Wald's paper about axiomatic QFT in curved spacetime, which cuts to the heart of the matter.
Last comment: Weinberg starts really nicely, but it degenerates into perturbative QFT after a few chapters.
 
user54412
user image
2
 
user54412
Wonder what evil powers I have......
 
@ChrisWhite /tools
YAAAAAAAY
Also the ability to view deleted things
 
@ManishEarth Try to solve this...
under 10 seconds...
 
@ChrisWhite Oh my... Now, I'm alone... Booo hoooo :'(
 
3:21 PM
@ShuklaSannidhya maybe later :P
 
alone?
 
@ManishEarth maybe later == I can't.
 
@ChrisWhite On the other hand, today I got a cool badge
@ShuklaSannidhya I assume it wants more than just brute forcing sqrt(a) to sqrt (b)
 
Why is the the derivative notation so misleading... $dx \over dy$, one may read it as $x \over y$.
 
@ShuklaSannidhya Use fluxions
 
3:26 PM
@ManishEarth Yeah... And my teacher would be like "what d'phuq are these dots?"
 
@ShuklaSannidhya That's his/her problem
 
@ManishEarth You use fluxions?
 
nope
sometimes
when I'm lazy
 
user54412
Newton <-> dots; Leibniz <-> fractions; Newton > Leibniz; therefore... ;)
 
I also use primes
 
user54412
3:28 PM
(when I was a college student, we debated Newton vs. Leibniz all the time - good old days)
 
Yay, new debate to start! :P
 
@ChrisWhite "Newton > Leibniz"? CITATION NEEDED!
 
You can always follow Einstein, and use subscripts.
 
OK, as I just use both randomly there's no point in me debating :P
@user1504 Yah, but then the implicit sum and whatnot will confuse the teacher further :P
I use $\partial_x$ and $\mathrm d_x$ though
 
user54412
@ShuklaSannidhya citation - the Royal Society's "Commercium Epistolicum" ruled in favor of Newton over Leibniz
 
user54412
3:31 PM
(never mind that it was written by Newton...)
 
Heh, yeah. When I was a student, I'd use tensor calculus & subscripts when div grad and curl was expected. Caused trouble with the TA's sometimes.
 
lol
 
@ChrisWhite And I bet somewhere and sometime Leibniz wrote "Me > Newton"...
 
I did that ... in a term paper. I was used to using summation notation while practicing. Oops
 
@ManishEarth aren't fluxions only for time derivatives?
 
3:35 PM
It's 9.... Convos haven't started yet..? :D
BTW, @ManishEarth: Your colg. didn't reopen yet..? o_O
 
user54412
@CrazyBuddy I feel bad for you - your summer breaks are so short
 
user54412
In the US, students demand 3-4 months of summer vacation
 
Yeah... Of course.. That's why I hate my colg. :/ :D
 
user54412
well you're at least probably learning more - the average high school/college student here just forgets everything every summer and has to relearn it
 
@ChrisWhite What..? Colleges --> 3-4 months..? Grr...
 
3:39 PM
@CrazyBuddy ":/ :D" ? ironic...
 
@ChrisWhite But, I forget too... Because, our syllabus is designed that way (so that students forget)...
First and second semester have no relation at all (neither does third) :D
From third, we study Aeronautics :)
 
and, subsequent semesters have relation to each other o_O
 
@CrazyBuddy 15th
 
@ManishEarth So, what's that actually..? :D
 
3:43 PM
@ShuklaSannidhya yep. Not sure though. I usually use primes for derivatives wrt x, and fluxions for time
 
(Do you do such things in IIT?)
 
@CrazyBuddy Markov-chain generated
 
user54412
excellent!
 
Woah... woah... woah... -_-
 
@ManishEarth the terminal is very annoying - home.iitb.ac.in/~manishg
 
3:45 PM
@ShuklaSannidhya I know. We had a very simple freshman web design competition. Finished the layout in 15-odd minutes, then got bored and saw the empty sidebar space
 
2 events are starting..!
 
@ManishEarth And it does some random things.
Well... my bad.... It ain't random.
 
@CrazyBuddy Markov chains generators basically look at the frequency of words occurring in a certain pattern, and make sentences that sound legit based on that. Google "research paper generator", there are many that do this using a basis of research papers in a topic. I jut took the LaTeX of one and modified it a bit :P
 
@ManishEarth Ahh... To speak truly, I learn a lot of stuff here (I mean, in chat)... So that, I can fool my friends :D
 
@CrazyBuddy what's the other one? QOTW in the DMZ?
 
3:51 PM
Yep...
@ManishEarth: It's really difficult when I think of entering new chat rooms...
 
hey there
 
user54412
Hi @David
 
user54412
here to announce the start of the event, as always? :P
 
lol
42 mins ago, by Chris White
user image
@DavidZaslavsky ^
 
nah, this is Manishearth's event
 
4:03 PM
really?
O_0
 
user54412
what is that symbol? ^
 
user54412
nm
 
It's MarkDown abuse
 
Anyway, let's start the event!
 
Actually, this event occurs with my permission..!
 
4:05 PM
Anyone have anything in particular to discuss about the close reasons, or should we just cycle through them?
 
Hi @David ;-)
 
user54412
I hereby use my mod tool powers to grant @CrazyBuddy 's permission
 
14
Q: What will our list of close reasons look like?

Chris WhiteAs per this meta.SO post, it appears an overhaul of the close system is underway. Of the numerous changes slated to take place, not a real question, not constructive, and too localized will no longer be reasons for closing, replaced instead by unclear what you’re asking, too broad, and prim...

 
user54412
@ManishEarth perhaps we should list out what ideas have been floated first
 
Alright
#1: Homework
> Our policy expects homework and homework-like problems to have some effort put into them, and deal with conceptual issues. Please edit your question to explain what you have tried and highlight the concepts.
and
> As per our recommendation on asking homework questions, "It's not enough to just show your work and ask where you went wrong. If you just need someone to check your work, you can always seek out a friend, classmate, or teacher. As a rule of thumb, a good conceptual question should be useful even to someone who isn't looking at the problem you happen to be working on."
and
> Homework questions must demonstrate some effort to understand the underlying concepts. For help asking a good homework question, see: How do I ask homework questions on Physics Stack Exchange?
 
4:07 PM
Hmm... The second one looks a bit broad. Maybe I'll vote for that...
 
#2 Non mainstream physics
 
> We deal with mainstream physics here. Anything that couldn't be published in a reputable journal is not appropriate on this site.
#3: Math
> Questions on mathematics are off-topic unless they relate directly to physics. These questions can usually be asked on Mathematics Stack Exchange.
#4: Engineering
> File not found
 
WWhat..?
 
That's pretty much it, barring tpg's "other" proposal
@CrazyBuddy No proposed text yet
All right, what Chris wants to say first
 
user54412
before that
 
user54412
4:10 PM
I'm still not clear - what's the story with people who can flag but not VTC directly?
 
user54412
what options do they see?
 
user54412
the same ones?
 
@ChrisWhite Ah. They can't trolley car
 
Yeah... Tpg...
 
They see everything else
 
4:11 PM
(yuck... Ranting - mobile sucks)
 
user54412
that's kinda unfortunate, since either (1) we use one of the slots for a trolley car, or (2) those people have a hard time flagging generic just-doesn't-fit stuff
 
@ChrisWhite yeah, I agree
12
Q: No custom off topic message when flagging on SO

Esoteric Screen NameI have less than 3000 rep on StackOverflow. Now that the new closing changes are live, I cannot supply a custom off topic message: I can enter a custom off topic flag message without issue here on meta, though it only has three canned off topic reasons, rather than five. I'm not sure if this ...

Indeed Physics gets plenty of hard-to-categorize corner cases that need closing, and our low-rep flaggers definitely help sort through these things by putting them in the close queue. Also we are actively trying to avoid relying on mods for closing. — Chris White Jul 2 at 15:44
 
user54412
(For everyone who thinks Manish and I are insane, "trolley car" = "this just doesn't belong here")
 
ah, been there, done that
Ok, onwards. (Unless we have any more queries ..?)
Alright
Homework
What say?
The current policy seems to be to only include questions about concepts, regardless of the work provided
More or less, the current policy says that "we allow HW which isn't Too Localized"
(Anyone there?)
 
user54412
yeah
 
user54412
4:16 PM
I like the rewording you gave
 
With this in mind I like @ChrisWhite's suggestion as it puts the primary focus on concepts
 
user54412
well, here's my thought on that
 
The issue is that it may be a bit harder to objectively apply
 
user54412
I like what I came up with (:P)
 
user54412
but... it doesn't cover all cases
 
4:17 PM
I think it's longer than necessary
 
user54412
and I really don't think we should have two separate HW options
 
That I agree with
 
@DavidZaslavsky FWIW, "Too Localized" and whatnot aren't that easy to exlain
agreed
 
Two separate HW reasons would just lead to confusion
 
in Teachers' Lounge, yesterday, by ManishEarth
> generate meaningful and lasting value for the entire community.
in Teachers' Lounge, yesterday, by ManishEarth
^ that's the most succint definition of "Too Localized" I've seen till now :)
from the ProgSE post
This could be useful
 
user54412
4:19 PM
I like Manishearth's suggestion ("Our policy expects homework and homework-like problems to have some effort put into them, and deal with conceptual issues. Please edit your question to explain what you have tried and highlight the concepts.") - it covers both of the main reasons reasonably well
 
hmm, true
 
user54412
@ManishEarth If not in a close reason, that snippet should go into the faq/about/meta/something where we can point to it
 
@ChrisWhite yes that
Or a pro forma comment
 
user54412
Here's a suggestion - can we have a meta post that lists these comments so others can copy/paste when they feel appropriate?
 
@ChrisWhite Yep
Or use the pro forma script
Btw, this is what the faq currently says. It also highlights concepts:
> Physics - Stack Exchange is not a homework help site. If you have a question about a homework problem, or any problem of an educational nature, narrow it down to the specific concept that is giving you trouble and ask about that. You can find more information about acceptable homework questions on our meta site.
 
user54412
4:23 PM
It's not bad, but I can see the issue - someone comes along and thinks "so I'm allowed to ask how, conceptually, to start this problem I'm clueless on"
 
yeah
it needs to be as objectve as possible
 
Well, the point of the FAQ is that "how do I start this question?" is not a physics concept
Just because you stick the word "conceptually" in the question doesn't make it a conceptual question ;-)
 
Yep
 
user54412
I agree - I'm just putting myself in the mindset of a lazy student :P
 
"I'd like to ask a physics question about how to increment a pointer in C++"
@ChrisWhite lazy student --> oxymoron
 
user54412
4:25 PM
-1: the answer is the last word in your question, duhh
 
LOL
@CrazyBuddy @user1504 @ColinMcFaul @twistor59 around?
OK, if we're going with my proposed reason, any idea on improvements to the wording?
Or keep it as it is
 
@Chris understood, but lazy students are just going to post their questions anyway. They'll either totally ignore the FAQ or find some way to justify to themselves why asking a no-effort homework question should be okay.
 
user54412
hmmm
 
Oh, btw, apparently there may be some snippets from the close reasons put in the How To Ask sidebar (@DavidZaslavsky, refer TL message #10236909
 
With them, it's more about having a good reason to point to afterwards, along with guidance on how to improve their question (that's what the meta post is for)
 
4:27 PM
@ManishEarth i'm here
i just haven't had any particular thought
 
user54412
I like the wording except for one, infinitesimal nitpick: "and deal with conceptual issues" -> "and to deal with conceptual issues"
 
@ColinMcFaul kk
 
@Manishearth noted
 
> Our policy expects homework and homework-like problems to have some effort put into them, and to deal with conceptual issues. Please edit your question to explain what you have tried and highlight the concepts.
 
user54412
given that you used a comma, it feels like the "to" can't be split over both infinitives
 
4:28 PM
Here, I've been thinking of something
 
I agree with @David: we can't put everything into the close box text, so we should include a pointer to the full explanation.
 
you're right
@ColinMcFaul yep. The HW reason has that
We may want to have a meta- post about nonmainstream physics too
The NM physics policy is not immediately obvious either
 
user54412
sounds like a good thing to have around
 
Sorry guys... I had to go out for dinner... I wasn't here at all..!
Maybe, I'll read everything tonight and ping accordingly..!
 
@CrazyBuddy A true physicist feeds off of gravitational waves
 
4:31 PM
The NM is also a little contradictory with the homework: technically speaking, a conceptual question about first-year homework would not get published in a reputable journal.
 
Yeah... Get me one... I'm hungry..!
 
@ColinMcFaul Yeah, I'm getting to that once we finalize HW
I realized the issues with NM while discussing it with MathOverflow
 
> Homework-like questions should ask about a specific physics concept and show some effort to work through the problem. See [our meta site]() for guidance on how to make your question better.
 
user54412
agreed with @ColinMcFaul - the publication bit sets a pretty high bar
 
Or something like that
Obviously the link would go in the place indicated
 
user54412
4:32 PM
ooh that's nice too
 
brb after dinner :) (don't mind me :P)
 
@DavidZaslavsky that would work
 
I tried to combine the best aspects of the three options presented
 
Though I prefer having at least some guidance in the close reason itself
 
see you @CrazyBuddy
 
4:33 PM
People may not read that long meta post
@CrazyBuddy cya
 
That could work. We could stick in another sentence in the middle
@Manishearth we could also put a TL;DR at the top of the meta post
 
@DavidZaslavsky yep
> Homework-like questions should ask about a specific physics concept and show some effort to work through the problem. Please edit your question to explain what you have tried and highlight the concepts. See [our meta site]() for more guidance on how to make your question better.
Stitched together
 
user54412
David's idea seems like a good compromise - the meta post isn't more overwhelming than the homework itself, while we still weed out anyone too laze to click on the link we spoon-fed them
 
This way there's an inline tldr, and a long reference post
 
If you just do that, though, I think the second sentence is kind of redundant with the first
 
4:35 PM
hmm, yeah
 
I'm thinking "HW-like questions should X" should be understood as "If you edit your question to do X, it'll be fine"
 
@DavidZaslavsky yeah
 
user54412
@ManishEarth I'm tending to agree with David here - "how to make your question better" => "you can edit it"
 
I mean, anyone who bothers to read and parse the close message should pick up on that
 
@ChrisWhite yep, however:
there's a key thing missing in most of these, it' the fact that it can be reopened
 
user54412
4:37 PM
@DavidZaslavsky read and parse - you sure ask a lot of our lazy posters :P
 
Well, it's sort of implied, but not as explicit as I'd like it to be. Or am I just being picky?
 
user54412
actually, on that note, what does one see when a post of theirs is closed?
 
@Manishearth true, that did occur to me
 
user54412
perhaps I should ask a bad question to find out?
 
@ChrisWhite "put on hold by <list of evil nazis>"
Basically, the same thing we see
 
user54412
4:38 PM
do they see anything we don't, like a notification?
 
With a caveat: The first duplicate vote puts up the duplicate banner for the eyes of the OP only
 
> Homework-like questions should ask about a specific physics concept and show some effort to work through the problem. If you edit your question accordingly, it can be reopened. See [our meta site]() for guidance on how to make your question better.
I don't especially like that particular phrasing, but I think we're moving in the right direction with that
 
yep
 
ack, can't edit messages from mobile
 
@DavidZaslavsky you can
now you can't
there's an "edit last" and "delete last" option
 
user54412
4:42 PM
I think David's was the best so far - I can't personally improve on it - but wait now I'm reading Colins's
 
> Homework-like questions should ask about a specific physics concept and show some effort to work through the problem. We want our questions to be useful to the broader community, and to future users. See [our meta site]() for more guidance on how to make your question better. If you edit your question to improve it, it will be flagged for possible re-opening.
 
@ColinMcFaul yes yes include the "broader community bit" :D
 
(I can't do markdown in chat)
 
done
 
Oh wait, possible re-opening.
@ManishEarth thanks.
 
4:44 PM
any objections/improvements on Colin's post?
 
user54412
On the one hand, I like explicitly mentioning the mechanism edit -> flag -> possibly reopened... on the other hand, it may lead to more questions from the OP than it answers
 
user54412
what's a flag? will it be reopened? or not?
 
@ChrisWhite yep
> If you edit your question to improve it, there's a chance it will get reopened
^ how about that?
Remember, edits push posts into the reopen queue
 
user54412
still makes it sound near-hopeless - there's a slim chance, if fate be with you, that you may get an answer here
 
I'm with Chris
 
user54412
4:46 PM
or maybe I'm reading this in an overly-cinematic voice
 
on that last point
 
hmm yeah
@ChrisWhite Note that the wording is "on hold", not "closed"
That may contribute to making it better
 
user54412
> Homework-like questions should ask about a specific physics concept and show some effort to work through the problem. We want our questions to be useful to the broader community, and to future users. See [our meta site]() for more guidance on how to edit your question to make it better.
 
I think it's an improvement.
 
@ChrisWhite Doesn't mention reopening (Is that the same one?) but since the wording is "on hold", may not be that bad after all
 
4:48 PM
My thought about the "broader community" clause is that it's not as direct. I wonder if askers will think through it enough to realize the significance, i.e. "I have to make my question useful to others" -> "I have to ask about a general concept"
 
Teh difficulty seems to be hitting the right balance between: "if you edit the question, it will certainly be reopened" versus "reopening is a totally random process, and your edit will have little influence on the process."
 
@DavidZaslavsky The concept bit is already there
 
Indeed
@Manishearth yeah, but then if it's already there, do we need to explain it again? I favor keeping the close reasons as short as possible.
 
@DavidZaslavsky we're explaining the why
 
I'm not really against this clause, it's a good thing to have somewhere, but I just question whether it's really necessary in the close reason itself.
Yeah, I guess I just think the why could be left to the FAQ or meta post.
 
4:52 PM
IMO long close reasons are OK. There's still a reasonable character limit, and these reasons fit that
A three line reason isn't much more intimidating than a two line one
 
...See [our meta site]() for more guidance on how to edit your question to make it better, and on the reopen process.
 
@Manishearth Difference of opinion I guess. That's OK. For me it's not about a character limit, it's about making your point precisely. General good writing advice.
 
@DavidZaslavsky True. For me it's about making it as unambiguous as possible
 
user54412
let's not forget that we have bold font to play with - a slightly longer narrative is more acceptable IMO if we tactically use bold to draw attention to the important points
 
Given the fact that "too localized" is too confusing
@ChrisWhite oh right font
 
4:55 PM
@Colin the thing with that is that the HW meta post doesn't explain the reopening process.
 
user54412
specific physics concept and show some effort
 
user54412
for instance
 
@Chris oh, I didn't know that.
 
> Homework-like questions should ask about a specific physics concept and show some effort to work through the problem. We want our questions to be useful to the broader community, and to future users. See [our meta site]() for more guidance on how to edit your question to make it better.
or yeah that
> Homework-like questions should ask about a specific physics concept and show some effort to work through the problem. We want our questions to be useful to the broader community, and to future users. See [our meta site]() for more guidance on how to edit your question to make it better.
 
That looks good to me
I kind of prefer the first
 
4:55 PM
@DavidZaslavsky look at the preloaded ones that Shog9 created. All bold.
 
user54412
me too - first one looks good
 
yeah
 
@DavidZaslavsky We probably should, regardless of the wording we settle on.
 
maybe just bold "show some effort"?
 
@Colin Yeah
 
4:56 PM
@ColinMcFaul We have that
13
Q: How do I dispute a moderator's action?

ManishearthA moderator closed/migrated/deleted a post, and I disagree with this. How should I proceed in getting this reversed?

Wait no
We don't
2 mins ago, by ManishEarth
> Homework-like questions should ask about a specific physics concept and show some effort to work through the problem. We want our questions to be useful to the broader community, and to future users. See [our meta site]() for more guidance on how to edit your question to make it better.
So, guys, finalize on this?
 
@Manishearth no, I like having both the concept clause and the effort clause bolded, because there are those two distinct reasons that hw questions are typically closeable
 
@DavidZaslavsky not waht I meant
 
Okay.... I somehow managed to follow the transcripts...
 
> Homework-like questions should ask about a specific physics concept and show some effort to work through the problem. We want our questions to be useful to the broader community, and to future users. See [our meta site]() for more guidance on how to edit your question to make it better.
^ @DavidZaslavsky that's what I meant
 
From now on, we don't have to insert comments regarding HWs like auto-comments ;-)
 
4:58 PM
Oh, OK. I could go with that
 
user54412
nice balance
 
user54412
+1
 
I think I still prefer the version with more of it bolded, but either works
 
@ManishEarth I agree with that one ;-)
 
We can also edit the HW meta post to mention something about reopening
 
4:59 PM
@CrazyBuddy which? #1, #2, or (|#1> + |#2>)/2
 
but that's for another day
 
@DavidZaslavsky yep
OK, so I'll post this on the meta thread
We'll leave it open for a day of discussion or so
Just in case there is any more input
 

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