The h Bar

2:46 AM

@0celóñe7 You're drunk, go home

4:08 AM

@Abcd we don't feel a centrifugal force. What we feel is a centripetal force i.e. the force pushing us inwards towards the centre of the circle. In your example this is the force exerted on us by the car sear.

4:21 AM

Last night dream: A simple quantum circuit which has a component that removes the exponential part of a quantum state

@JohnRennie That's true, but it feels like we feel a centrifugal force.

@DawoodibnKareem It's the same fallacy as the downwards gravitational force. What we feel is the force from the ground pushing us upwards.

In regards to the dream, there are two ways to interpret that circuit element: Either it is a dephaser that decohere the quantum state, or it is some kind of booster that remove the exponential decay element of the quantum state

@JohnRennie Have you been listening to that Einstein fellow again?

@DawoodibnKareem :-)

4:24 AM

Nondimensionalization

Nondimensionalization is the partial or full removal of units from an equation involving physical quantities by a suitable substitution of variables. This technique can simplify and parameterize problems where measured units are involved. It is closely related to dimensional analysis. In some physical systems, the term scaling is used interchangeably with nondimensionalization, in order to suggest that certain quantities are better measured relative to some appropriate unit. These units refer to quantities intrinsic to the system, rather than units such as SI units. Nondimensionalization is not...

arxiv.org/abs/1606.07301

Unable to find any element in quantum computing that can deal with exponential decay of signal

@Secret Do all your dreams come with references to published papers?

So far no. The dreams even came up with their own journal papers in some well known journals (such as Chem Comm. for some of my organometallics dreams) that does not exists in reality

How inconvenient.

As far I know, my dreams are a self contained reality which have almost no ties with real life except for tangential related things.

It is very good at coming up with ideas that even some experts will found interesting, but it is extremely poor in solving problems I want to solve

The more academic dreams, however, does often lead me to interesting journal articles that I otherwise will not found, though, via keyword searching

That it is poor at solving problems is illustrated in some of my past dreams: Recall that I have been programming a script to do 13400 calculations for me, in some dreams, python programming is involved in the scene and it is even directly related to the program I am trying to do. However the code is all nonsense with wrong syntax and stuff

5:27 AM

What's gong on in here?

@Secret This is an important technique.

It's what's really going on when people make such ridiculous claims as "we set c=1".

@DanielSank What are you doing up this late?

yeah, it is in some sense more convenient than to have a bunch of constants in every step of your calculation. However trying to get the units back after the computation is done is not so trivial as GR demonstrates

5:45 AM

@DanielSank Watching television is more difficult when c = 1. It really sucks having to wait for the picture to arrive.

@DawoodibnKareem heheh

@Secret Right but if you are more clear and say things like $t' \equiv x/c$ then the substitutions are trivial.

@BernardoMeurer Programming.

@DanielSank That's a lie, physicists can't code

I can code better than u.

Only if you're talking about Python's async features

@DanielSank It is definitely a lie, but you might actually be coding if people didn't keep interrupting you in this chat room.

5:55 AM

Speaking about coding, I have been struggling for 3 weeks on my python code to get my 13400 calculations to work. While I have managed to code the program that will generate 120 energy files (that took 2.8 weeks), the next step is to get it into some PBS batch job so that after it optimise the moelcule, it automatically feed those to do the frequency analysis

@BernardoMeurer Or anything OOP.

rekt

@DanielSank Not true, I can handle myself in OOP

I admit you have me beat on systems.

@DawoodibnKareem Good point, although I think we distract ourselves. The internet does not jump out and distract the peaceful programmer.

@BernardoMeurer Dave Bacon has something to tell you.

And the CERN data reduction team.

They should all be using C

Perhaps.

What's your point?

You said physicists can't code.

5:59 AM

If you think I had a point you don't know me well enough

-_-

Anonymous

@BernardoMeurer lol

Anonymous

:P

I haven't showered in DAYS

Anonymous

That's not enough for a world record.

Anonymous

6:01 AM

Don't bathe for years.

Thank goodness this is a chat room, not a smell room.

Not sure how that would work.

@DawoodibnKareem Smellevision.

I can smell that I stink

gross

Anonymous

Apple might come up with something like iSmell :'D

6:02 AM

Go shower.

@DanielSank Wanna go see the eclipse tomorrow?

I'll give you soap if you need.

@BernardoMeurer Maybe. When is it?

I want to go dancing tomorrow. There's a class taught by a visiting performer from Argentina.

Oh, wait, it's monday

crap

@DanielSank Who?

Anonymous

BTW, can some math person help me with epsilon-delta proof of L'Hospital's rule? I'm so stuck

6:03 AM

Ehh, hang on let me look it up.

@Blue What are you stuck with exactly? Which part don't you understand?

@Blue I can prove it: It works

proved

@DawoodibnKareem it's someone from this upcoming performance.

I looked at an annular eclipse with the naked eye once. Looking back, that was probably stupid.

@Blue Ask a real question.

@DawoodibnKareem Yeah don't do that.

6:05 AM

@DanielSank Well, it did look quite cool though, as the annularity formed.

@DanielSank Buy me a good bike lock

@Blue there's a post on ProofWiki. Does that help?

@BernardoMeurer no

I have cream-sodad and snacked you

see gchat

Anonymous

6:07 AM

@DawoodibnKareem Epsilon delta proofs seem a bit hazy to me. First we have to find a $\delta>0$ such that $|f(x)-L|<\epsilon$ whenever, $0<|x-x_o|<\delta$. (Where $\epsilon$ is any small positive number). I don't see how we can find $L$ from this definition. We have to know $L$ beforehand and only then we can prove that it is the limit using epsilon-delta method.

Anonymous

@JohnRennie I'm checking it out!

@Blue AH

^

@Blue Suppose you want to prove that $\lim_{x \rightarrow x_0} f(x) = L$.

@Blue Yes, true. You can use L'Hôpital's rule to find $L$, but then you have to prove that it's the right thing.

Then you have to prove that if I give you $\epsilon$ you can find $\delta$ such that $|f(x) - f(x_0)| = |f(x) - L| < \epsilon$ as long as $|x - x_0| < \delta$.

Anonymous

6:10 AM

@DawoodibnKareem Oh! So we need to know $L$ beforehand by the traditional method of finding limits by algebraic manipulation. And then using epsilon delta we prove that it is indeed the correct one. Amirite? :P

@Blue Yes, exactly.

Bye, everybody.

Anonymous

Thanks people :)

@DanielSank They're both barefoot in that first photo. Isn't it awfully difficult to dance tango barefoot on a wooden floor?

Anonymous

@DanielSank Bbye

6:12 AM

@DanielSank Good night.

user228700

6:36 AM

Wadup, everyone? :-)

user228700

I've come for my weekly dose of kindness after yet another terrible week at college YAY! :-P

user228700

@JohnR: Are you around?

Anonymous

Hey :)

It hasn't been the best week, that's certainly true

user228700

@Blue Hey! :-) You seem to be learning lots!

Anonymous

6:39 AM

@Kaumudi.H Yay. Finally I'm free to learn without giving a damn about exams (for a while) :P

@Kaumudi.H any plans for today? Cycling? Pizza?

A working Internet connection? :-)

Anonymous

Eh...I think connection problem...

Sir Cumference

Howdy

@Kaumudi.H Wow, hello! It's been a while! You having fun?

Anonymous

12 mins ago, by Kaumudi. H

I've come for my weekly dose of kindness after yet another terrible week at college YAY! :-P

Anonymous

6:49 AM

Doesn't seem so XD

user228700

I'm sorry about that; my had dad called to advice me about my particularly uncomfortable roommate situation.

@Kaumudi.H Oh dear. Is it just one roommate who's the problem?

user228700

@Blue Hehe, I'm glad you're having fun! :-)

user228700

@DawoodibnKareem Hi, there! :-) Yes, it has!

user228700

@SirCumference: YELLO! :-)

Sir Cumference

6:51 AM

@Kaumudi.H How's college :)

Anonymous

@Kaumudi.H My situation is same as yours actually. Got a few jerk classmates who are trying to bully me over Whatsapp. I'm ignoring them and complained about them to the Anti-Ragging cell. Might file an FIR if the situation gets worse. But yeah, have made a couple of good friends as well who are helpful. :)

user228700

I only have one roommate but she can be quite annoying and my dad only called because this annoyance extends in a direction in which I am getting very poor sleep because of her.

@Kaumudi.H So she's noisy?

user228700

@Blue Oh God, was it really so terrible? :-( I'm so sorry, man.

Sir Cumference

@Kaumudi.H I assume you've told her to quiet down?

Anonymous

6:53 AM

It will get better with time. If she is annoying you too much consider complaining to the authorities.

Anonymous

@Kaumudi.H Sort of. But can't do anything. The world is full of jerks. I hope this phase will pass.

user228700

In addition to having screaming contests with her mum in the middle of the night, she also refuses to switch off the light at any point in the night.

user228700

@Blue Geez, blue, what did they do? :-(

@Kaumudi.H Steal the light bulb.

user228700

@JohnRennie :-P I'm sorry. I have no plans, no. Well, actually, I was going to do laundry in the pouring rain in a few and then visit my cousin but that plan isn't particularly exciting, lol.

user228700

6:57 AM

@DawoodibnKareem :-/ When I asked her to pipe down quite politely, she merely looked at me in anger. I had been sleeping quite peacefully too, until then :-(

So when does she sleep?

Anonymous

@Kaumudi.H Basically it is that petition issue which I refused to sign (stating that such protests and petitions are silly; we should focus on our studies). After that ~~they~~ one particular guy had removed me from Whatsapp. But on Friday a classmate (who is sort of a nice guy) added me back into the group. Then, again, that guy who removed me earlier started sending me threats that he'll beat me and stuff like that along with one or two friends of his.

Anonymous

So I complained to the anti-ragging cell and told him that I'll file an FIR if it goes too far.

user228700

@DawoodibnKareem She is extremely erratic; she spends all day being incredibly unproductive with a book open on the side. In the night, she falls asleep with the light on and when she wakes up again-be it 2 AM-she will continue "studying" as if there had been interruptions in the first place.

user228700

@Blue Oh God, that sounds terrible. It's good that you reported it (Y). Do keep us updated on the issue. I really do hope it will get better soon.

7:01 AM

@Kaumudi.H Is there someone you can arrange to have screaming contests with whenever she's trying to sleep?

Anonymous

@Kaumudi.H Yeah. Same to you. :)

user228700

@DawoodibnKareem No, man, I gotta sleep :'-(

@Kaumudi.H You seem to have a lot of laundry to do. The bachelor technique is just to buy lots of clothes and then do a massive laundry run as infrequently as possible.

Anonymous

@DawoodibnKareem That's going to make the situation worse.

@Blue I know. I was speaking in jest.

user228700

7:03 AM

"You gotta adjust" is what she said, in spite.

user228700

@JohnRennie Oh, I only do it during the weekends :-P

@JohnRennie No, the bachelor technique is to buy lots of clothes, and pay a visit to one's mother when there are no clean ones left.

@DawoodibnKareem Yes :-)

user228700

To be clear, BTW, I've gotta wash them by hand. There are no machines here.

@Kaumudi.H Oh that really sucks the monkey.

7:04 AM

@Kaumudi.H !!!!

Are there any laundrettes nearby - assuming laundrettes exist in Kochi ...

user228700

This is the superb view from my desk by the window and it is where I should be in a few...

user228700

Anonymous

.........

user228700

GAH, how terribly long that took! :-o

Anonymous

superb =P

7:08 AM

Is that the garden of the YWCA?

user228700

For those who do not understand: it is the place to do one's laundry by hand.

user228700

@JohnRennie -_- Very funny indeed.

It wasn't meant to by funny. I'm unsure what I'm looking at.

Anonymous

@JohnRennie C'mon. That looks like a garden ? :'D

Anonymous

:)

user228700

7:10 AM

@JohnRennie Ah, and now I've explained it!

What are the four tables?

Anonymous

You place clothes on those

Anonymous

To wash them by hand

user228700

They're not tables, John! Like I said, it is the place to do one's laundry.

You'll need to bear with me as I've never seen that method for washing clothes. In the UK if you need to wash clothes by hand you typically use a tub and washboard.

Anonymous

7:12 AM

But whew . There should be a laundry nearby. It's terrible to wash clothes by hand.

user228700

Yes, you place your clothes on them and scrub them by hand, one by one by one by one...

Teeeeeeeedious!

user228700

Thanks :-(

As Blue asks, are there any laundries nearby?

user228700

I don't think so, no.

user228700

7:14 AM

All the resident students here wash their clothes by hand.

It has to be worth a look, especially now you have the pushbike available.

Loong

This is how it's traditionally done here:

Though only if you like wearing carpets :-)

user228700

Trouble is that one cannot trust these laundries; they bunch all of the clothes into a single pile and...

user228700

@Loong Beautiful people doing laundry on a beautiful river is beautiful :-)

user228700

7:17 AM

It has been raining too, all day long, so I must wash them in the pouring rain :-(

How will you dry them?

user228700

Gah, I am the depressed bot of this room. I always come with teeerrible news :-P

How is the course going?

user228700

@DawoodibnKareem Don't ask :-( I don't even have one set of dry uniforms to wear to college tomorrow.

user228700

@JohnRennie Meh.

7:19 AM

@Kaumudi.H I don't think anybody begrudges you your rants. We just feel powerless to help.

I can't wash your clothes for you, or send you more dry ones.

Just meh. That's a little disappointing. Though I guess the first terms lectures are only introductory.

user228700

@DawoodibnKareem Aw, thanks :-) I really do wish I lived in this room.

hey all

@Kaumudi.H I wish you a best of luck for the next 4 years :P

Your laundry situation is horrible

user228700

@JohnRennie It is, yes. Well, I dunno, really. Everything is quite meh at the moment.

user228700

BTW! The disks arrived yesterday!

7:21 AM

BANG!! :-)

user228700

:-) My parents found your letter and had themselves a chuckle, haha.

Holiday photos :-)

user228700

@PrathyushPoduval Hey! Thanks :-P

But it worked. It got through customs :-)

user228700

Absolutely! :-) YES! If only my laptop hadn't died, lol.

7:23 AM

@Kaumudi.H Is that a mango tree in the background?

user228700

Yup.

You ever tried plucking it from your room? :P

with a long stick

user228700

That would have to be a terribly long stick. Besides, mango season has come and gone, man.

Mmm, mangoes ...

user228700

:-)

7:25 AM

Can you buy dried mango in India?

user228700

Alright, I better get to my heap of clothes before it starts pouring again.

user228700

@JohnRennie I think so, yeah.

user228700

Why dya ask?

Dried mango is nice, though obviously a very different texture, and available all year in the UK.

@Kaumudi.H I don't know if this is any use, but if you're at the YMCA Women's Hostel in Kochi, there's a place called Black N White Laundry and Drycleaning Services about 1.5km from you.

user228700

7:27 AM

Ah, what? Wokay, I will Google them and call them immediately.

Worth a look I'd say

They look quite a professional organisation

user228700

Clearly, I am a doofus incapable of doing anything, like Googling.

Free collection and delivery!

user228700

Hmm, but money money money! I wonder how much they charge.

user228700

I'll call them :-) Thanks so much <3

7:29 AM

There's a prices page on the web site

user228700

x'D Nope, cannot afford this.

Yes, they seem very expensive - they charge per item not per load. Sorry for the bad suggestion.

Do you want me to tell you about the other two laundromats within a similar distance? Or will you google it yourself?

user228700

No, no, it was very kind of u to suggest it :-) Thanks so much for looking it up :-)

user228700

It may just have made my day, lol. This speaks about the quality of my days :-P

user228700

@DawoodibnKareem x'D I'll do it! :-) Thanks so much!

7:32 AM

There's a Big Joss Quick and Clean.

and a place called Fabriclean.

user228700

Ah, I'm looking at the page and they're all quite far from where I live.

It's a bit further away though. It's on University Road, close to the highway.

user228700

...especially after accounting for the ups and downs of roads hereabouts.

Oh, it's hilly?

user228700

Very.

7:35 AM

It's hard to tell from the satellite view. If you have your bicycle, this is one way to get fit.

user228700

It's OK :-) Thanks so much for trying! I would've asked a senior about it but after one of them humiliated me for asking her what was for dinner last night, I decided not to bother.

Oh. And what was for dinner last night?

user228700

Fried rice and rotis! :-) Special dinner, last night!

user228700

Man, and she went around shouting about how I had dared to ask her a question to everybody in the mess.

Hmm. I don't want to try an unspecial dinner then.

user228700

7:39 AM

x'D NO, you do not!

Anonymous

Oh

:39510305 You are misparsing it.

"shouting to everybody in the mess" .... "dared to ask her a question".

Anonymous

My goodness. She seems to be cr*****.

user228700

Yup. It made me feel very warm inside :-P

Anonymous

@DawoodibnKareem Got it got it

7:41 AM

@Kaumudi.H I hope they all laughed at her for being such a rhymes-with-stitch.

user228700

Anyhoo. I should do something about my laundry...

user228700

@DawoodibnKareem No, they all glared at me.

Anonymous

@Kaumudi.H Try to make friends with the fourth year students (who have a good track record). They are usually more helpful. Start by adding them on Facebook

@Kaumudi.H Yes, you seem to be procrastinating.

Anonymous

They're the best people for asking career advice

7:42 AM

Of course, John, Blue and I are all helping with this.

user228700

Actually, I have found a great friend in a 4th year bhai. He helps me out a lot!

user228700

He was a mentor in GSoC last year.

Anonymous

@Kaumudi.H That's great. You could also ask him how to deal with your roomate. He might be able to help you out

user228700

@DawoodibnKareem :-P True.

user228700

@Blue Ah, lol, maybe :-P

user228700

7:44 AM

Wokay, I will see you all later :-) Thanks so much for being the kindest people I know. Have a great day/night! :'-)

Bye

@Kaumudi.H You too. Take good care of yourself.

Anonymous

Bbye. Hope you have a good day :)

Q: How to prove L'Hospital's rule using epsilon-delta method?

@JohnRennie Sorry, not sure how I managed to ping the wrong person just then.

Anonymous

8:10 AM

0

For epsilon-delta proofs, basically we need to find a $\delta$ such that $|F(x)-L|<\epsilon$ whenever, $0<|x-a|<\delta$ (for a small positive number $\epsilon$). To prove L'Hospital's rule (for when numerator and denominator function both tend to $0$ as $x\rightarrow a^{+}$) let us assume $F(x)...

real-analysis limits epsilon-delta

Anonymous

@DawoodibnKareem After this should I apply Cauchy's mean value theorem?

@DawoodibnKareem that is the truest thing in the world

Wow... I am living far too comfortably here

Oh and @blue want to hear an awesome idea I had yesterday? /s

Anonymous

What?

8:26 AM

So, we NSS class today at 6:30 AM. Now, I thought I can't wake up so early. So, I Shouldn't sleep. My plan almost worked to perfection. I stayed awake till 5 AM and then inexplicably I fell asleep and missed my class

If only I had slept early last night, I would probably have woken up in time

Anonymous

looool

Anonymous

Happened to me so many times

Anonymous

What is NSS btw?

Social Service.

Today was Yoga Class

Anonymous

Meh

Anonymous

8:29 AM

Too boring

It is compulsory

Anonymous

Really? That's bad

Anonymous

You have grades for that?

Well, we have a choice between NCC/NSS/PEd

No credits this year, but they can ask you to repeat the course if you don't attend minimum number of classes

Which is.. I think 85% of the total.

Anonymous

I see

Anonymous

8:32 AM

Hmm

Anonymous

Here, nothing is compulsory :P

Anonymous

You just need to keep 60% attendance I think

@Blue Follow proof 1 on that page that John R gave you the link to.

I wouldn't want to repeat the course, of course. In the next semester, my workload will increase. I should minimize these types of nonsense in the next sem

Anonymous

8:44 AM

$$\left\vert{\dfrac {f \left({x}\right)} {g \left({x}\right)} - l }\right\vert = \left\vert{ \dfrac {f' \left({\xi}\right)} {g' \left({\xi}\right)} - l}\right\vert < \epsilon$$

Anonymous

@DawoodibnKareem I understood upto this step. After this I can't understand how they proved $l$ is indeed the limit

9:10 AM

chat history seems intense

Anonymous

@BalarkaSen!!!!!!

Anonymous

Halp

you seem to have an answer on that question already

Anonymous

Oh. I just opened the site. Checking

btw imho you should have just signed the petition if you wanted to stay out of trouble

i mean one is perfectly free to choose not to but i would have

just to keep out of the shit

9:17 AM

@Blue But that's the definition of limit.

They've shown that $\left|\frac{f(x)}{g(x)}-l\right|<\epsilon$ which means, by the definition of limit, that you've found the right value of $\delta$ to make $l$ the limit.

Anonymous

@BalarkaSen The problem was not with signing the petition. But the way in which they were telling us to go on protests with them. That was quite rude. It was necessary to raise voice. Anyhow, from now on I intend to stay far far away from all these matters and just sign (but not go on any protest march with them). BTW, who knew there were such jerks in my class. I hadn't expected such a retaliation.

ah no i would not have gone to the protest

I did tell you J was notorious

Anonymous

@BalarkaSen My parents lured me into joining by praising J. I had sufficient rank to get into any NIT, BITs Pilani or even some IITs.

Anonymous

Anyhow, some students are indeed serious and good in studies in my class

Anonymous

Hope to make friends with them and wish this phase gets over soon.

9:24 AM

yeah I know you did quite good in JEE, which is why your choice surprised me a little at first

I know some really good students who come out from J, and also some good professors

the political shitstorm is at it's peak though

@Blue Do people in WB think highly of JU?

Anonymous

@PrathyushPoduval Yes. Some even think JU is better than IIT KGP

I do not think that is true.

Anonymous

That couldn't be further from the truth

Anonymous

:'P

Anonymous

9:29 AM

@BalarkaSen Ask my grandpa :P

Anonymous

All relatives gather after your results are out to take your life decisions for you :D

Oh I meant to say that I think JU > IITKGP is not true, not that I think some people think JU > IITKGP is not true

Now I am just being confusing

true that

Anonymous

But well, leave it. I don't want to discuss much of the ongoing shit over here. hbar is the place I visit to keep my mood stable. :)

What happened after that complain you placed with anti-ragging cell?

Did the guy get expelled or something?

Anonymous

9:41 AM

@PrathyushPoduval Nothing as yet. They will take action on Monday

Anonymous

(I hope)

Okay

Do they have a good track record of taking care of complains? :P

Anonymous

@PrathyushPoduval I think so. Last year they suspended a few students for ragging a junior.