The h Bar

2017

12:01 AM

Basically (-3)-(-5) >0 and so is (5)-(3). (for example)

@skullpetrol jeemain.nic.in/WebInfo/Handler/…

skullpetrol

Thank you @2017

2017

@Kaumudi.H Aha, so I checked the official syllabus again and they haven't mentioned that topic. It seems it isn't there :-). Probably sir taught it to us for our CBSE examination!

skullpetrol

"Cannot Verify Server Identity"?

2017

@skullpetrol Really?

skullpetrol

Yup, says safari.

2017

12:08 AM

@skullpetrol Okay try this (jeesyllabus.in/jee-syllabus)

This is not the official one though ^ (but almost same)

0celo7

@ACuriousMind I'll let you guess. We were doing hyperbolic geometry today and he was treating $ds^2$ in the metric as a "distance"

He was trying to be informal since it's not a geometry class

ACuriousMind

@0celo7 smbc-comics.com/comic/2012-07-17?

0celo7

yep :)

2017

@Kaumudi.H Fun Fact: Understanding the working of Vernier Callipiers and Screw Gauge properly took me more time compared to whole of Electromagnetism :-P

ACuriousMind

@0celo7 Hehehe

skullpetrol

12:11 AM

That one works @2017 thanks again :-)

2017

@skullpetrol You're welcome :-)

0celo7

@ACuriousMind When he was doing that, I asked him if this was now a physics lecture :D

then he referenced that comic

ACuriousMind

It's good to see even Elven lords appreciate webcomics :)

skullpetrol

They don't call it "comic relief" for nothing :P

ACuriousMind

@skullpetrol Call what comic relief?

Comic relief is when a funny scene or character lightens the mood of an otherwise serious story

skullpetrol

12:20 AM

Comics.

ACuriousMind

Something funny that you read to laugh about it is not comic relief

skullpetrol

Are you saying that the relief that a comic provides is not comic relief?

bolbteppa

@0celo7 did you get Kato's proof of the JNF?

ACuriousMind

@skullpetrol Yes

skullpetrol

Thank you.

ACuriousMind

12:26 AM

"comic relief" is a specific term that denotes the role of a comedic element in an otherwise serious/dramatic story

It does not refer to general relief provided by comics, or comedic things in general

skullpetrol

TIL :-)

0celo7

@bolbteppa What?

bolbteppa

Kato derives the 'canonical form' in chapter 1, the Jordan form, using residues and resolvents

0celo7

Oh, Jordan normal form

I didn't read it carefully, no

bolbteppa

It's pretty cool but messily explained there

2017

12:32 AM

@skullpetrol Where are you from ?

0celo7

Do you understand his talk of branch points for operators in chapter 2?

bolbteppa

12:43 AM

@0celo7 at the beginning of the chapter?

0celo7

12:54 AM

Yes

bolbteppa

1:06 AM

If you treat an operator $T(x)$ as a perturbation of a well known operator $T$, having known eigenvalues and eigenvectors, by some 'small' operator $xT'$, i.e. $T(x) = T + xT'$, then the question is whether the eigenvalues and eigenvectors of $T(x)$ are similarly nice perturbations of order $x$. To find out, you set up the characteristic equation for $T(x)$ and find out that the eigenvalues of this new $T(x)$ depend on the entries of the matrix $T(x)$, hence on $x$, in crazy ways, due to roots.

But now due to this $x$ dependence, the number of eigenvalues can actually change at certain points, indicating the relationship between a perturbation of an operator and of it's eigenvalues is not direct in the way that was hoped.

Not sure where the Riemann surfaces of Banach manifolds is coming in yet :p

0celo7

1:43 AM

@bolbteppa you haven't said anything concrete

hey

2:28 AM

@2017 I got these cases , what about when P and V both increases and P ,V both decreases

2017

2:43 AM

@hey Draw a graph and see what happens..

BuddyJohn

hello. sorry, but I have a newbie question.

When discussion starts to happen in comments, I see it often move to chat, and there is a room that says "Imported from a comment discussion on .." How do you create such chats?

2017

When P and V both increase then $W_{irrev}>W_{rev}$ and the reverse holds true for P and V both decreasing. @hey

hey

3:07 AM

You are using which convention

@2017 if reverse holds then the inequality does not apply

2017

@hey What?

hey

Classius inequality does not hold

2017

I don't know from where you got that weird idea. Clausius inequality holds in the whole cycle.

Take into account the signs

I only stated the magnitudes

hey

If w(rev) is more than w(irr) , then q(irr) is greater than q(rev)

2017

@hey Take into account the negative sign -_-

hey

3:13 AM

Are we dealing with physics convention

2017

@hey What convention do you want to use?

I'll explain you using that

hey

Physics

Let V increases and P decreases

Then w(re)>w(irr)

2017

Yeah so take an example value. dw(rev)=4 and dw(irrev)=5 in first case when both P and V increase

hey

And both are positive

@2017 fine

2017

and dw(rev)=-5 and dw(irrev)=-4 when both P and V decrease

hey

3:16 AM

Yes

2017

5-4>0 and so is (-4)-(-5)>0

hey

Yes

2017

So that's it

@hey Okay?

hey

Sorry internet problem

@2017 yes ,this is for one case

heather

@2017, hello =)

2017

3:20 AM

@hey This is for two cases: When P and V are both increasing and when both decreasing!

@heather Hey :-)

How are you ?

hey

@2017 ah yes

heather

@2017 pretty good, how are you?

2017

@heather Exam season :-P Bit of pressure :-) Do you have half yearly or annual examinations at school ?

hey

Now take P decreases and V increases

heather

@2017 not yet - that fun starts next year. We get normal tests though (like at the end of units)

best of luck with your exams!

2017

3:22 AM

I will join undergraduate college course this year :-) School ended last month!

Probably will take up engineering

or physics

heather

oh, you just finished highschool!? congrats!!

for some reason, I thought you were a college student =)

2017

yes ! I'm both happy and a bit nostalgic :-P

@heather Hehe, no :-D

heather

where you thinking of going (for college)?

2017

@heather India only. In Kuwait we don't have any good technical college :/

heather

@2017 ah. Have you considered America at all (biased person speaking =P)

2017

3:26 AM

@heather LOL :-D I did. But actually it will be a bit difficult to stay there all by myself. I have family members in India :-)

I even took SAT and TOEFL

heather

@2017 ah, that makes sense then.

@2017 how'd it go? =)

2017

@heather Good enough. I got selected for quite a few US colleges too! :-)

heather

@2017 wow, that's awesome!

2017

@heather You will be in grade 9 this year, right? :-)

heather

Well, I'm in grade 8 currently, but yeah, i start 9th this fall.

that's the first year of highschool for us, don't know if that's the same for you guys.

i'm super excited!

my mom on the other hand is all "you're growing up so fast" =)

2017

3:28 AM

Grade 9 is highschool?? Here it is 2 years before highchool . Grade 11 is highschool here

heather

oh, how many grades do you have?

2017

@heather I know that feeling :-)

heather

we have 4 years of highschool

2017

@heather 12

@heather Oh, we have 2!

heather

only 2 years of highschool??

2017

3:29 AM

That's why

heather

wow

2017

@heather We don't call grade 9 as high school :-P

That is middle school

heather

generally, K-5 is elementary, 6-8 is middle school, and 9-12 is highschool here

2017

I see. You have a slightly different system!

heather

sometimes the middle grades are shuffled around a bit - like sometimes 9 is moved down to middle school, or what have you, but the general idea is fairly consistent.

@2017 what is yours like?

2017

3:31 AM

@heather I meant US has a slightly different system of education

compared to the East

@heather Right!

heather

@2017 no, I know, I was asking what your system is like =)

user228700

@heather: I'm sorry about last night when u spoke about spring break--I was a bit busy trying to understand something.

heather

@Kaumudi.H oh, no, not a problem =)

2017

@heather We have LKG, UKG, Transistion, and then grades 1 to 12! LKG starts at 3 years age.

heather

did you figure it out? @Kaumudi.H

user228700

3:33 AM

Also, @2017: Nope, it's not in syllabus. Thanks :-)

2017

LKG=Lower Kindergarden

user228700

@heather For the most part, yes :-)

hey

@2017 I am not getting with other two cases

2017

I guess I got to go and study now :-) Have a good day @heather !

@hey I'll get back to this later! Gotta go

hey

Np @2017

heather

3:40 AM

@2017 have a good day =) congrats again

user228700

@heather: (I'm sorry about last night and right now, when I still haven't gotten around to replying to ur message about spring break etc :-|)

heather

@Kaumudi.H not a big deal =) thanks though

user228700

OK :-/ Exams coming up, that's why.

heather

ah, best of luck!

user228700

Thank you :-) Enjoy ur break!

heather

3:45 AM

thanks =)

skill patrol

Hi peeps :-)

user228700

4:15 AM

Hi :-)

user228700

@JohnR: Do ping me when(/if) u are available to take questions about LCAO (pls :-P)

user228700

4:28 AM

Does anybody here know about what "2s-2p" mixing is in LCAO?

user228700

*know what

PhysiBoy

@Kaumudi.H we don't have it in our syllabus of jee adv. Jee main may be kind enough to touch that topic a bit.

user228700

Lol, "kind enough" :-P

PhysiBoy

@Kaumudi.H it is just the interference of wave pattern involved in 2s and 2p orbitals.

user228700

What dyou mean?

PhysiBoy

4:43 AM

If you have read about Schrödinger's wave equation then you will get it better.

user228700

...I have. Can u please elaborate your point? As it is, it's difficult to understand exactly what u're trying to state.

PhysiBoy

We have a wave func rep 2s orbital and another one rep 2p orbital.

user228700

Uh huh...

PhysiBoy

Just interference of those 2 wave patterns is LCAO!

user228700

...I know.

user228700

4:45 AM

Hang on, were u trying to explain what LCAO is?

PhysiBoy

So what is ur prblm?

user228700

Oh, lol, I see that I didn't actually ask the specific question :-P

PhysiBoy

:p ask then

user228700

My "problem", PhysiBoy, is that I don't understand how 2s-2p mixing is able to affect the order of filling of molecular orbitals.

user228700

...in that this order changes ever so slightly as one goes from $N_2$ to $O_2$ (and beyond)

PhysiBoy

4:47 AM

Ok so you are talking about sp mixing in nitrogeb?

Ok so first are you aware of gerade and ungerade MO?

user228700

@PhysiBoy No. Well, I dunno. My question is about that change in order.

PhysiBoy

Until you understand what gerade and ungerade means you won't be able to step inside sp mixing.

user228700

I do understand what gerade and ungerade mean but fail to understand why this has anything to do with my question...

PhysiBoy

For know do not explore topics which you do not understand. This will lower your confidence for mains.

Focus on what you have learnt till know.

user228700

Lol, I appreciate your concern but I think I know what I'm doing, thanks. Can u explain about it?

PhysiBoy

4:50 AM

Ok wait a sec.

I have a photograph explaining all of that.

But how do i send it?

user228700

What are u on--mobile/pc?

PhysiBoy

Mob

user228700

Right. Dyou see an "Upload" button near the box in which you type, next to the "Send" button?

PhysiBoy

Nup

user228700

...Alright, dyou see three horizontal bars at the top left-hand side of the page?

PhysiBoy

4:53 AM

Yes

user228700

If u click on that, you will see an option: "Go to Full Site"

PhysiBoy

Ok done

user228700

Once u click on that, you will be redirected to the desktop version of this site, where u'll be able to see the "Upload" button near the "Send" option next to the box in which u type.

user228700

Dyou see it?

PhysiBoy

No

user228700

4:54 AM

What dyou see?

PhysiBoy

Nthing

user228700

What? What does ur page look like?

PhysiBoy

Desktop type but no desktop like features

user228700

Gimme a minute.

user228700

PhysiBoy

4:57 AM

Any mail id?

user228700

Is that not what your page looks like?

PhysiBoy

Similar but no upload button

user228700

Huh. That's strange.

hey

@PhysiBoy hey

user228700

Dyou have an account on imgur? If you would be so kind, you could upload the picture over there and post a link here.

PhysiBoy

4:59 AM

No

user228700

...alright, never mind, then.

user228700

Thanks anyway :-) I'll ask JR when he comes on.

PhysiBoy

Ok

2017

5:26 AM

@PhysiBoy Just go to ask a question section of any SE site and paste your image there to get an imgur link. Copy paste that link directly over here. The image will appear. That is a temporary solution till you get access to the upload button.

user228700

^ This is excellent advice but it's alright, @PhysiBoy, u don't need to bother urself :-)

hey

in JEE Preparation, 3 mins ago, by hey

@2017

user228700

5:53 AM

Dyou guys know how to find the bond order of heteronuclear diatomic molecules? It's easy enough once the order of filling of their molecular orbitals is determined and this will...vary for different molecules, no?

user228700

(Ever since Doraemon was banned/suspended, I've expected him to return. In the span of a few months, lots of JEE aspirants have joined the conversations in chat and now I suspect almost everybody of being an imposter :-P)

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