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12:03 AM
Is there a way to integrate sinc(x) after expanding it as it's Maclauren series and then just letting each term cancel a factor of x out?
rather than taking the LaPlace transform
 
why did you capitalize the P
 
Idk I'm autistic
 
fair enough
@Phase there's a rule for taking integrals of power series
but I think you should be safe with what you suggested...just don't expect the result to make sense
some random infinite series is likely just as unhelpful as the unevaluated integral
 
Welp
Probably a waste of time asking about it anyway
Idek if I'm continuing uni till thursday
gg
 
what, why?
 
12:08 AM
long story m8
but if I get dropped it's for the best anyway
 
what??
 
I could build a house with the question marks
 
no!
 
maybe I should evaluate Sinc(x) with a question mark shaped contour
Damn
That can be my door
You're cool though. Thanks for always humouring / answering my dumbass questions
 
thanks; do you wanna talk about it?
 
12:12 AM
Another brick for my House. Nah it's cool man, I'm just venting against better judgement. I'm not gonna start a therapy session though, thanks for the offer though
Hows the rain?
 
finally stopped
my backpack is still wet
 
What country is this again?
 
hopefully it'll be dry in the morning
@Phase America
 
Oh, are you near the flooding?
 
we're having some hurricanes right now
@Phase no
 
12:13 AM
Yeah I heard. Sounds pretty nasty
I'm gonna come off for the night, thanks for humouring me again. Peace
 
night
 
@0ßelö7 Strangely, that word can refer to so many geographic areas, LOL.
 
I'm pretty sure in the context of countries, "America" refers to only one.
 
Yes, if it is countries.
 
And even without that context, no one unironically refers to their location as America except for Americans.
 
12:18 AM
I guess what I said was really stretching things too much.
Hurricane Harvey is bad.
But the floods around India have killed more than a thousand it seems.
 
Natural disasters are bad no matter where they occur. It's time to go full Matrix on the world.
Can't have natural disasters if the world is in ruins.
 
The worst one in recent times was the 2004 tsuanami that killed over 200,000.
 
We just need to get rid of the oceans.
 
Strange that most of the body and most of the earth is water.
 
*surface of the Earth
 
12:23 AM
The moral of the story is to drink lots of water to keep the doctor away, LOL.
 
leave the faucet on while brushing your teeth
@KyleKanos 'sup
 
@0ßelö7 Wait, I don't get that one.
 
@Jasper it wastes a lot of water
 
Oh, LOL.
I saw Balarka and your room, LOL.
 
@Jasper you should keep an eye out for the new Einsiedler book. It could displace Yosida/Reed-Simon/Rudin as the standard references
 
12:26 AM
@0ßelö7 The thing is functional analysis means so many things that a book with that title can treat so many different topics.
I do like Conway's book though.
 
I have it on my shelf. Good reference, though having 1000 exercises makes it a tough read
 
And of course, Conway has sort of a sequel to that book.
A course in functional analysis is followed by a course in operator theory.
 
Conway used to be the head of my department
@Jasper Have you read the second book?
 
@0ßelö7 Simon has written A comprehensive course in analysis, 5 volumes, AMS.
@0ßelö7 Nope.
 
@Jasper no one has time for 5 volumes lol
 
12:30 AM
@0ßelö7 I think that set replaces a large part of what the Reed Simon set does. More updated, with different titles to avoid confusion, LOL.
 
I find it amazing that none of the standard books have any decent treatment of nuclear or Montel spaces.
One has to go to specialized books like Schaefer for those.
And that one is also plagued by 1000 exercise syndrome.
Advanced books really should give references for the exercises. Do the exercise if you want but if you're researching and have to do an exercise in the process, it can be quite frustrating.
Especially because you might be lacking some lemma, etc.
 
I dislike books which leave important theorems to the exercises.
That is one reason I don't really like Rudin's books anymore.
 
@Jasper So, Conway.
 
I don't deny that doing exercises can be important in learning a subject, but some people only have time to read the text and not do ALL the exercises.
And sometimes, we don't even know whether there is a mistake in the exercise or not. Maybe it can't be done, lol.
 
Petersen's exercises are like that.
One could write papers trying to solve some of them. Third edition ones.
 
12:35 AM
LOL.
 
Do you have the 3rd edition?
 
No, I don't. For some reason, I thought you were German, LOL.
I think it's because of your username.
 
Look at this monster
 
LOL.
 
12:39 AM
The last time I checked it was on Russian servers as well.
I am going to sleep. It is 8.40 AM here now. Good night!
 
Night
wow
@DanielSank Is S2 when N and co. appear?
 
1:20 AM
@BernardoMeurer can I count on Linux help this time tomorrow?
 
@0ßelö7 Let me check my schedule
 
(or any time after 5 pm my time)
 
Probably yes. I have a call tomorrow but dunno when yet and should be earlier than this
Sure thing
 
thanks
 
@0ßelö7
 
1:23 AM
yes please
although according to the phone we won't have rain for a week
 
1:45 AM
@dmckee My astro professor cited your answer here in a discussion of centripetal force in the context of orbital mechanics.
8
 
that seems like a hack that works out
not a proof
 
He termed it an "approximate derivation".
 
that's basically what physics is
 
2:05 AM
@BernardoMeurer yo can u do tikz?
 
@0ßelö7 I did a PERT diagram with it once and some Chem drawings
But I wouldn't say I know tikz
 
2:16 AM
@BernardoMeurer I need to get into it but I don't know how to begin
I need to draw some level sets in $\Bbb R^3$
 
2:34 AM
@0ßelö7 no idea what you're asking.
 
@0ßelö7 Just do a PERT diagram
 
@0ßelö7 My first suggestion would be the pgf manual, but, as most other LaTeX references, it is obtuse. Skim through the chapters that interest you and go from there.
 
@HDE226868 I'm duly flattered, but I'm going to have to tell myself it was selected for the presentation because the basic idea is certainly not original to me.
I'd say it most recently in Cutnell and Johnson's book and I'm fairly sure I first saw in my high school physics text in 1988.
 
my high school physics teacher didn't give a damn about derivations
she said that people who do derivations don't get paid much, so why bother
 
@JohnRennie Copyright is evil, I only laugh at free jokes (free as in freedom)
 
2:46 AM
@BernardoMeurer My tech teacher loved to draw these.
Like cavemen
 
@BernardoMeurer no idea what that is
 
He's a great guy, he just sold his soul to Siemens
 
@0ßelö7 Google
 
@BernardoMeurer must be some CS thing
 
@0ßelö7 No, it's a management thing
 
3:25 AM
@BernardoMeurer same thing
 
for GR we're using Sean Carroll's book
 
lame
 
our QFT course is being taught by the smart string theory guy 👀
 
lame
 
3:41 AM
@0ßelö7 who is the ideal QFT professor for you?
I get the impression from faculty that the experimentalists never teach the course
or even the regular graduate QM I/II for that matter
 
@GPhys I can't imagine ever taking a QFT course
 
4:14 AM
I just noticed that (with the one I just started we have a dozen active bounties right now! Wow!
 
Anonymous
5:01 AM
@EmilioPisanty Nice. Check out the last 30 days statistics for those. Many of the top 10 tags on that list have >70% unanswered rate. We should do something to get those answered.
 
Anonymous
Last 30 days statistics is what matters.
 
5:30 AM
@Blue I very much disagree. There's too much noise and too little data. The 30-day numbers look pretty useless to me.
You only get numbers that high on very small tags that had three questions in that one-month period, as far as I can see
But maybe you can provide better data?
@dmckee nice (except for the mismatched parens =P
 
Anonymous
@EmilioPisanty By "small" tags I guess you are referring to the number of questions belonging to those tags? My point was that those tags are "small" because not many people ask questions on those and also not many people answer questions belonging to those tags.
 
Anonymous
If you are not content with 30 days, perhaps we could check out the data for last 1 year
 
Anonymous
I don't think it would be much different
 
Anonymous
Let's take superconductivity for example. 7 out of the 8 questions went unanswered in the last month
 
Anonymous
That's not healthy
 
7:05 AM
@SirCumference there is a Trash room and a Trashcan room. The latter is mod only I think. Presumably it's used when the mods want to keep a copy of offending messages for future investigation.
 
Anonymous
9
Q: Fixing Binary search bug from Bentley's book (programming pearls: writing correct programs)

Jayram SinghBinary search can be implemented in many ways-recursive, iterative, conditionals, etc. I took this from Bentley's book "Programming pearls: Writing correct programs" which is an iterative implementation, and that includes a bug. public class BinSearch { static int search( int [] A, ...

 
Anonymous
I was being taught the wrong code for Binary Search all this while
 
Anonymous
Huh
 
Anonymous
I wonder how people took decades to figure this bug :P
 
Anonymous
7:21 AM
 
Anonymous
How is the recurrence relation using $\leq$ rather than $=$? I don't understand
 
Anonymous
Shouldn't it be $T(N)=T(N/2)+1$ ?
 
Anonymous
Do you know? @JohnRennie
 
Anonymous
According to me the Time taken to binary search on an array of N elements should be equal to time taken to binary search on one half of the array + 1 (1 denotes the time taken to halve the array)
 
Anonymous
So there should be an equality, isn't it?
 
Anonymous
7:25 AM
Is it because $N/2$ may not be an integer?
 
Anonymous
That's one possibility...hmm
 
@Blue It says T(N) is the is the time taken to search in a subarray of size <= N though, not on the whole array of size N. Maybe that's it?
 
I wonder what happens if a planet atmosphere rotates at 100 times the planet. Should expect stormy weather. But what if the planet itself have difficulty keeping up with the rotation and result it's surface to behave effectively frictionless to its atmosphere:?
 
Anonymous
7:43 AM
Say, our sorted array is {1,2,3,4,5,6,7}. We need to show T(7)<=T(3)+1
 
Anonymous
So, say it searches on only the first 5 elements
 
Anonymous
But then T(3) could search on any 2 elements
 
Anonymous
Or even 1 element
 
Anonymous
How do we say that searching the first 5 elements takes less than or equal time (for searching the first two elements)+1
 
Anonymous
This doesn't make sense :P
 
7:45 AM
spacetelescope.org/news/heic1713 Planets e,f,g may have substantial water
 
Anonymous
 
Anonymous
@BalarkaSen I think the previous slide is most probably wrong. Other websites seem to state $T(N)=T(N/2)+O(1)$
 
Anonymous
Their definition of $T(N)$ doesn't make sense
 
vOv
 
8:40 AM
@Blue Because you might get lucky and e.g. hit the element you are searching for at the very first comparison. The $\leq$ means this is a worst case estimate for the duration of the search.
@Blue I think raw data of "% unanswered" won't tell me anything about how good the site is doing in these tags. Maybe the questions asked are just not very good so people don't want to waste their time answering them. Maybe the questions are really difficult and would require rather lengthy answers which no one has found the time to write yet. Maybe the questions are about a really obscure subfield where it's unlikely we have anyone versed in it.
 
9:10 AM
@Blue l? u? A? K? That disgusts me
I actually have to read the code and follow through with what it's doing in order to understand its function. That's... Just No
 
@Mithrandir24601 And how often have you committed the exact same sin in naming your variables? ;)
 
@ACuriousMind I learned programming from someone with a PhD in CS (actually the only teacher I had in school with a PhD :P ), then I went into (initially) a CS degree. So, never. It's been drilled into me never to do such a thing
 
9:26 AM
And you never gave in to temptation, not even for these tiny auxiliary functions you'll certainly get right and that no one else needs to read? :P
2
If so, I tip my hat to you, sir!
 
@BalarkaSen Give me some time. I'll get to it
 
@ACuriousMind what, loops? Of course :P
Admittedly, I have written bits of code that weren't well commented or well laid out before, but that's a different problem :P
 
Recently, inspired from some PhD presentation of glasses in a group meeting, was thinking about composite systems that might behave like an orientational glass
Consider the above simple model of a cube embedded with roughly spherical components. The components are locked in position thus they cannot translate nor vibrate. However, they are free to rotate in in place
 
@ACuriousMind I believe the closest I got to that was using 'long f0, f1, endValue, fCur, guess' for a bit of 4 line code for a programming exercise
 
Suppose each of these spherical components has a couple of rotational modes which can be excited when sufficient energy is supplied to the whole cube (e.g. in the form of heat, or light etc.), one interesting question will be the entropy of this cube
While the cube has a fixed volume, thus if each pixel of the cube is a (classical) particle in the statistical mechanics sense. Assuming the particles are independent of each other, then we would expect there will be at most 3N-6 degrees of freedom, where $N=\rho V$ is the number of particles in the whole cube
However the above cube contains not just isolated ensemble of particles that can freely move about in the cube, but also 64 spherical components that only have rotational degrees of freedom. Do we expect the entropy of this system to be less than a cube without these spherical components?
In addition, if the spherical components start to rotate due to excitation, since each rotating component introduce torque, I think I would expect the moment of inertia of the cube to increase
There are various things I am interested about this cube system:
1. Is it possible to pack more entropy into this cube by somehow introducing extra degrees of freedom in the form of rotations?
2. Will the cube's moment of inertia be dependent on the number of spherical components (and what rotation mode) is being excited as energy is supplied to it, despite the spherical components are locked in terms of translational and rotational degrees of freedom?
 
9:46 AM
@Blue Having actually looked at the data, it does look very different.
 
3. It is easy to see that if the spherical components are e.g. charged, has some magnetic ordering etc. will exhibit long range interactions with other parts of the cube. However, will long range interaction arises if the spherical components don't have any special states (e.g. neutral, non polarised, non magnetic and so on)?
Typo: The question marks should be :? (as otherwise this question is too broad or hw sounding), but comments are welcome
 
@Blue That's a meaningless metric. Did you actually look at the questions involved?
The "100% unanswered in the past 7 days" means strictly this: this question
0
Q: Magnetic force and atoms of supercooled helium in a vacuum

Cantabrigian24I'm trying to predict what would happen to supercooled helium atoms in a vacuum when a strong electromagnetic field was present nearby. I think that a Lorentz force would move the helium atoms away from the source of the magnetic field - is this correct?

was wrongly tagged and has not been answered
In tags with that little traffic, fluctuations of that sort can make up the entirety of your signal.
Similarly, the past-30-days metric includes such jewels as
-1
Q: Difference between levitating a magnet above a superconductor and a superconductor above a magnet?

ChrisTI was wondering the difference in levitation criteria between levitating a magnet above a superconductor (assume type-I to ignore flux pinning) and a superconductor above a magnet? For the latter, I think you can consider the superconductor as a perfect diamagnet, meaning the criteria for levitat...

is this the kind of shiny example that you want to shove highly-qualified traffic to?
That also tells you that that Unanswered count does not discriminate against posts with negative score
which makes it unusable
that means: don't use it.
 
Oh and almost forgot:
4. Another interesting consideration is if the cube is at the nanoscale, where quantum effects become important and the rotational degrees of freedom are treated quantum mechanically. Perhaps some long range interaction will arise due to the rotational wavefunctions overlapping
I am interested in systems which has a fixed volume but very high entropy (or maybe the more approporiate term is the density of states). This is because such compact, high entropy systems, with significantly higher entropy than the surroundings, are expected to behave as very good energy sponges, which might help on dissipating heat from devices
If the answer to 2 is yes, then we can also have some kind of compact system where its moment of inertia can be tuned by its internal rotational degrees of freedom
 
10:10 AM
^ my eyes, they bleed
 
Just to be sure, the dipole moment is called the dipole because the simplest way to realize a charge distribution with a nonzero dipole moment - but vanishing all other moments - is a pair (therefore "di") of nearby charges. Similarly for quadrupoles, octupoles etc. (powers of two). However, that doesn't mean that the number of charges always has to be a power of two (and they have to be pointlike): almost any charge distribution carries almost all the multipole moments. Just trust the formulae instead of words, and don't misinterpret the words. — Luboš Motl Nov 16 '11 at 17:43
I never knew the dipole term can exist with just a single charge
 
10:27 AM
@Secret It's as a result of it not being on the origin...
 
I was suspecting that, before I dimiss that idea from my mind because it felt too simple as an explanation, but make sense, for we knew that multipole moments are coordinate dependent
(Some supplementary info) What I said about moment of inertia can be roughly (insert suitable word) from here:
The difference being instead having one bulky mechanism within the cube, you have an array of them and they are not directly controlled by machinery
 
 
1 hour later…
11:42 AM
whatup everyone, it's lunchtime \o/
 
Anonymous
@ACuriousMind In that case T(N) would be constant. But T(N/2) would be order log(N/2) (if we search for the subarray in which the element is not present. Hence the < sign would hold in such a case and not the = sign!
 
Anonymous
Got it
 
Anonymous
(I'm talking about the case where we hit the required element at the first shot )
 
11:57 AM
Hi everyone...
I have a question from thrmodynamics...
What should the graph of internal energy vs temperature look like for an isothermal process?
From first law dU=0 and temperature always remains constant in an isothermal process.... how should the graph of U vs T look like?
 
wait
 
I made that mistake few minutes ago
 
$U$ doesn't change because $T$ doesn't.
It's just a point
since $T$ isn't changing, so there's no 'trajectory'
 
Yeah that's what I presumed...
 
What's the answer, if you read that somewherE?
 
12:06 PM
I don't know the answer...
But that's what I also thought it should be...
 
Yep it is a point, on a $U-T$ graph. It can be wildly different on another graph though
 
Yeah
What about adiabatic process?
 
ugh no. I messed it all up
Mixed up isothermal and adiabatic :|
 
So dQ=0 in adiabatic
 
It'll be a curve this time. I don't know what kind though; I can't recall the relations
Because $T$ will definitely change, and so $U$ will too
 
12:15 PM
Yeah true
 
$\Delta U = \Delta W$
if I'm not wrong?
 
dU=-dW
I have comeup with something
 
Right, if you say so. I always get confused with the sign conventions. Chemistry had a different one
 
Verify it
So
dU=-dW
Now dW=-pdV
dW=pdV
Also pv is directly proportional to T from pv=nrt
So dU should be directly proportional to T
 
@ACuriousMind I ran out of letters on my fluids homework and named a point $M$
 
12:26 PM
@tatan So a straight line
 
@Avantgarde am i correct in my reasoning?
 
@Avantgarde In my uni, our chemistry uses $dU=\delta Q-\delta W$
 
@tatan Seems to be so yeah
@Secret I gave up long ago trying to memorize which sign went in where.
 
12:55 PM
I don't remember signs, but the convention we are taught is that work done by the system will reduce the internal energy of the system
Interestingly, regardless of conventions, we both use $dU=TdS-pdV$
 
1:37 PM
@ACuriousMind I need a legitimate GR expert. Whom do I talk to
 
1:50 PM
@0ßelö7 I don't know many GR people. Is it a question you could ask on the main site?
 
2:06 PM
@ACuriousMind Probably, as long as I don't reveal my true intentions
 
0
Q: Should close notices be more specific?

OokerRecently I've asked an off-topic question: How to plot forcing oscillation with damping correctly?. The close notice has only one line of instruction: This question does not appear to be about physics within the scope defined in the help center. I agree that this is not about physics, but t...

 
@ACuriousMind but I infinitely prefer a discussion to the Stack Exchange format
 
2:20 PM
in Mathematics, 19 secs ago, by FuzzyPixelz
Quantum mechanics would be interesting, and by that I mean counter-intuitive and mind blowing :)
 
2:40 PM
hey everybody , a good day to you all
Here I came across conflict ,
A problem is given:

That a conductor(rod) is hung through to wires
and a magnetic field is perpendicular to the plane of conductor, now we have to calculate the direction and magnitude of current so that the
wies holding the rod are relieved of tension, everything seems sweet and simple
The bone of contention is
according to right hand rule direction of the current should be from left to right( in +x axis)
so that force is upward ( +j) to relieve tension
 
Anonymous
@tatan $U=nC_vT$ for ideal gases. You can usually take $U_o=0$ at $T=0 K$. So the graph would be of the form $y=mx$
 
Anonymous
But then T is constant
 
Anonymous
So it would just be a point
 
Anonymous
2:59 PM
@Xasel What do you mean by plane of conductor(rod)? Also, please use MathJax for asking questions and add diagrams if possible.
 
Anonymous
3:10 PM
@EmilioPisanty There were several good questions (having the condensed matter tag) which went unanswered last month
 
Anonymous
Some more examples:
 
Anonymous
1
Q: Terminology surrounding superconductors and the Meissner-Ochsenfeld effect

Quantum spaghettificationAs stated in (Annett, 2004;pg 55) not all materials whose resistances vanishes exhibit the Meissner-Ochsenfeld effect (MOE). Which of these is therefore the defining property of a superconductor (if either)? And... If it is the vanishing resistance - is there a specific name given to supercondu...

 
Anonymous
<https://physics.stackexchange.com/questions/352147/how-do-i-determine-the-ferro‌​magnetic-exchange-stiffness-from-magnetisation-measu>, <https://physics.stackexchange.com/questions/352153/london-equations-what-is-the‌​-mass-is-present>, <https://physics.stackexchange.com/questions/352282/effect-of-electric-field-on-‌​graphene-in-2d-reciprocal-space>
 
Anonymous
<https://physics.stackexchange.com/questions/352634/can-magnons-exist-at-t-0-wit‌​h-a-inhomogeneous-magnetic-field>, <https://physics.stackexchange.com/questions/352916/effective-hamiltonian-of-pho‌​sphorus-with-spin-orbit-coupling>
 
Anonymous
<https://physics.stackexchange.com/questions/353313/ionized-impurities-in-semico‌​nductors-under-room-and-incerasingly-high-temperatur>
 
Anonymous
3:13 PM
@EmilioPisanty I could show atleast 10 more good questions with this tag which went unanswered last month
 
Holy spam
 
Anonymous
I'm not trying to pick up a fight but there is surely less answerers for condensed matter compared to some many other tags
 
yeah well, for now I flagged all your messages for spamming
your account will be suspended and deleted
and your pet will die
 
Anonymous
@EmilioPisanty Do let me know your point of view. I suppose the examples I gave are examples of good (atleast not bad) questions
 
Sid
...whoa
 
Anonymous
3:19 PM
If we consider a tag like special relativity (physics.stackexchange.com/questions/tagged/…) on the other hand, much less good questions went unanswered.
 
Anonymous
This is strange because in the real world there are obviously more physicists working on condensed matter than on relativity.
 
Anonymous
@AccidentalFourierTransform Phew :P
 
Anonymous
I think I'm done for now
 
well, every physicist that works on CMP knows SR, but not vice-versa, right?
 
Anonymous
@AccidentalFourierTransform Every physicist who works on CMP wouldn't bother to answer SR questions instead of CMP questions...
 
Anonymous
3:22 PM
They might answer a few
 
Anonymous
But still it doesn't sound right
 
I mean, who cares? it's CMP, that's barely physics...
:-P
 
Anonymous
@AccidentalFourierTransform If CMP isn't physics then GR is math. :P
 
Anonymous
And yet GR tag exists on this site. lol
 
CMP?
@Blue what?
 
Anonymous
3:29 PM
@0ßelö7 Condensed matter
 
@Blue You keep talking about monthly statistics like they're meaningful
and you keep talking about the unanswered stats of individual tags like they're meaningful
Your original claim was that routinely has more unanswered questions than other comparable tags
None of the evidence you've put forth so far gets even close to supporting that claim
Sure, you can cherry-pick plenty of good questions from that tag that are unanswered. But you can do exactly the same for any tag that's big enough.
 
Anonymous
@EmilioPisanty If monthly statistics are not meaningful then what is?
 
Anonymous
Yearly?
 
@Blue I'd put the bar at six months
but yearly is probably better
or, if you want, six-month averages of monthly statistics
 
Anonymous
IMO last 6 months should be fine to tell us the story
 
Anonymous
3:35 PM
We don't need to check before that
 
If you haven't realized just how jumpy the statistics are, and how susceptible they are to monthly and weekly variations in rates, then you haven't been looking at those stats for long enough.
 
Anonymous
Sure, I'll can collect all the good questions which went unanswered in CMP in the last 6 months
 
@Blue Is that opinion grounded in any evidence, or did you just pull that number out of a hat?
@Blue sigh. No, that's not the point.
@Blue The key phrase in your claim is comparable tags
If your stats are not a comparison of unanswered rates vs other tags, coupled with metrics that show that the tags are comparable, your stats are meaningless.
 
Anonymous
@EmilioPisanty We are talking about the current situation of the site. It doesn't make much sense to dig into history before 6 months or 1 year
 
@Blue ::facepalm::
here's one concept that's relevant to condensed matter:
 
Anonymous
3:37 PM
@EmilioPisanty So, in your opinion what makes two tags comparable?
 
fluctuations
@Blue question rate
 
Anonymous
@EmilioPisanty Ok. So in that case the you'd like to know (No. of good unanswered questions in the last 6 months/1 year for a particular tag)/(No. of good questions asked in that particular tag in the last 6 months/1 year)
 
 
Anonymous
It shouldn't be tough to find that ratio
 
Anonymous
For two different tags
 
3:40 PM
@Blue Yes. Luckily enough, I already went and dug out those numbers for you.
 
@blue: this is what I meant
 
And, as I said before, CM does not particularly stand out as unduly underanswered.
 
according to Right Hand rule, the answer should be current is in the direction from left to right (+ x,axis)
 
Anonymous
@EmilioPisanty The numbers you had dug out earlier included all questions (including downvoted questions)
 
@Blue please don't make false claims
 
3:41 PM
where B is into plane of the conductor( B = B (-k)
and putting the value s into the equations yields vector in the direction -y or (-j)
rather than the upward direction as desired (+j)
since i x (-k) = (-j)
 
Anonymous
Oh, the code checks for score>0
 
@Blue in case the SQL wasn't transparent enough
 Post.Score >= 0
 
Does anyone have the book "Solid State Physics" by Hook&Hall digitally?
 
Anonymous
That should have been mentioned in the title :P Anyway, so CMP stands at around 29%
 
3:45 PM
I thought it would be easy to find, but so far I'm only getting weird books that seem like a bunch of lectures together
 
@ShaVuklia does libgen not have it?
 
let me try
oh I had forgotten about that site
 
@Blue Not strange at all when you consider that SR is something people simply interested in physics might pick up, but significant CM expertise will be rather rare outside of actual physicists actually working on it.
 
@Blue sigh. Yes. And perturbation-theory is at 33%, but I don't see you rising a stink about getting more people to answer those questions.
ditto with CFT, topology and computational-physics
 
Anonymous
@EmilioPisanty Alright, sorry for that. But well, CMP does lie among the top 10 unanswered tags. Should we not do anything about it? Or let it be as it is?
 
3:48 PM
@Blue You keep trotting out phrases like "top 10 unanswered tags", without specifying the relevant metric, like they mean something
they don't
 
well, I have intuition that the if current considered the actual flow of electron(negative charge) then it will yield finally (+j) but I doubt that that HS books use Benjamin's convention ?
 
@Emilio as far as I can see, they don't have it either:(
 
and, if what really worries you is the top 10 of that query, why aren't you tearing out your clothes over perturbation-theory?
@ShaVuklia yeah, that's a bad sign, then
 
Anonymous
@EmilioPisanty Well, it's because I'm more interested in CMP. I didn't look at the perturabation-theory questions as such.
 
@Blue confirmation bias, much?
 
3:50 PM
@ShaVuklia : Law of Ebooks states that if a kindle version of the book exist then surely a digital manifestation of it exist , you only need to think creatively to find it !
 
Anonymous
Anyhow, if no one feels there's a problem of less answerers for certain tags, then I'm fine. It just seemed from my experience in the past 2-3 months (since I started learning this subject) that CMP questions don't get answered much.
 
Anonymous
The past 1 year statistics seem to tell a slightly different story
 
Anonymous
Well, it might just be fluctuations as you said @EmilioPisanty
 
But anyways, to do some of your homework for you: yes, condensed-matter does stand out from that list in that, even though there is a rough continuum of unanswered rates going from the 20%s to roughly 40%, once you take a reasonable definition of that rate, CM is a good deal larger than the rest of the tags on that list.
i.e. the only other question to top 400qs/yr on that list is solid-state physics
(though then again QFT isn't that far behind, at 22% over 1yr, and that one is much larger)
The important thing to note is that those statistics have some reasonable measure of tag size, and they provide differentials over comparable tags. If you want to argue that CM deserves special attention, it needs to be on those grounds.
 
@Blue I think phrasing it as a "problem" might be the wrong way to think about it. We have several areas where it would be nice if we had more knowledgable people contributing. Nevertheless, the site mostly still works in these tags - I'd not say there is an urgent problem
 
3:59 PM
@Blue And that doesn't even touch the real issue: what do you propose to do about that unanswered rate, and more importantly, why and how would those actions actually solve the 'problem'?
 

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