The h Bar - 2017-05-26 (page 1 of 2)

« first day (2395 days earlier) ← previous day next day → last day (2538 days later) »

Mithrandir24601

12:31 AM

@DanielSank and anyone else who's doing research/work in areas such as quantum info/computation/technology - if you don't mind me being really annoying for a minute, can I ask (with the expectation of the answer being 'no') is there anyone in your group who's going to be in England at all over summer, who'd be interested in giving a talk to a dozen first-year PhD students?

@Mithrandir24601 I support this sort of request.

I do not plan to be in England. Were you thinking a technical talk or more career oriented?

Mithrandir24601

@DanielSank It would be a technical talk - I'd be delighted if someone came all the way to England, but I'm aware it's a long journey, so I'm not really expecting anyone to be able/interested in coming

(although it does happen that people just happen to be there for one reason or another...)

2

Q: Hypothetical - If a gravitational wave was somehow produced on Earth, could its origin be triangulated?

Suppose object X is hidden somewhere on Earth and can, somehow, produce "weak" gravitational waves, that do not cause anything perceivable by people, but can be detected by all gravitational wave sensors on Earth. (I understand it's impossible due to mass issues, but just suppose it happened by m...

gravitational-waves ligo

What the heck is here "non-mainstream"......!

It seems the vtc voters had a bad day today.

Maybe they mix the words "hyphotetical" and "non-mainstream".

1:07 AM

@Mithrandir24601 yes, it's good to ask.

@peterh I've never understood the "non mainstream" close reason.

@DanielSank Thanks. I think it is an euphemism for pseudoscience.

@peterh ooh

@DanielSank GR questions tend to end up as nonmainstream too likely. I don't know, why. I think it is a bug of the community.

@peterh a bug?

That's funny.

@DanielSank Yes, its reason has to be found and fixed. My tries into this direction weren't successful until now, although some years ago the situation was far worse.

Btw, some days ago the site stepped over the 100000 vtc reviews.

2 hours later…

3:49 AM

@BernardoMeurer Hit the deadline!

When do you have to do the presentation on it?

1 hour later…

5:00 AM

@BernardoMeurer: for what it's worth, the presentation is a great opportunity to make yourself look good and it's worth putting a lot of effort into writing it.

You want to show you've put a lot of thought into the fundamental design, and use the talk to highlight the strategy you've used to simplify the implementation.

I'm sure @dmckee will back me up on this :-)

5:14 AM

Suppose, I hook a block of mass m on a spring of force constant k hanging from the ceiling. I leave the system to come to equilibrium [or alternatively oscillate about the mean position]. Assume I do no work on the block-spring system. How do I show that the block oscillates about x=mg/k, with maximum extension 2mg/k?

@Truth-seek Hi Truth-seek. Are you PhyEnthusiast?

Yes, I am

Sry for the confusion

@Truth-seek OK. If you start with the spring unextended and the mass stationary then the PE of the spring is zero and the kinetic energy of the mass is zero. So far so good?

@Truth-seek by the way, if you start message here with @ then John that that makes my PC beep. This is a good way to attract my attention since I'm trying to work through a report at the same time as answering you here.

@Truth-seek: Hello?

5:44 AM

@John Rennie sry I went away for some time

@Truth-seek you're back :-)

Yeah

20 mins ago, by John Rennie

@Truth-seek OK. If you start with the spring unextended and the mass stationary then the PE of the spring is zero and the kinetic energy of the mass is zero. So far so good?

@Truth-seek Is that OK as a starting point?

Ok

@John Rennie Ok

Now we let go of the mass and it accelerates downwards. As it falls the spring slows the mass, until at its lowest point the mass comes to a halt.

5:46 AM

Ok

At this point the mass is again stationary so its kinetic energy is again zero, and the spring has been extended by some distance $x$.

ok

So now we can use the energy balance approach you tried earlier. The mass started with zero KE and finished with zero KE, so its only energy change is the change in PE of mgh.

So the initial potential energy of the block is now completely the elastic potential energy of the spring

got it that gives us the max displacement

as 2mg/k

Exactly: $$mgh = \tfrac{1}{2}kx^2 $$

5:49 AM

got everything thn u so much

thank u for ur time and patience

@John Rennie thn u for ur time and patience

@JohnRennie Yes, @BernardoMeurer presentations are tough, but they are an opportunity to make a really strong impression.

Is this to be a slideware presentation? Has someone given you the usual starting advice?

Then, do you have someone you can dry-run it on? Ideally that would be someone with experience watching and giving these talks, but anyone is better than no one.

6:05 AM

The mirror doesn't count :-)

You need real feedback.

You could do pseudo presentation in here as an AMA?

What do you think? @dmckee^

I think having a live, in the room audience and having to talk through the thing is the most important thing. That experience is not well duplicated in other contexts, and it freaks most people out the first dozen or so times.

indeed

No harm in going over the intended presentation in other contexts—it'll give people a chance to point out lack of clarity in the presentation and give a sample of the kind of questions to expect.

Indeed, knowing what questions to expect allows you to prepare some after-the-end slides that address them and then you look super smart.

4

yup :-)

2 hours later…

7:59 AM

Welcome @DavidZ

Hi

I'm just checking in briefly

cool

Is Yitang Zhang a national hero in China? @DavidZ

I doubt that most people in China know who he is

Too bad.

I mean, in any country, even the US, I doubt that most people know who he is

8:06 AM

Ya, he's a very soft spoken person who likes to left alone.

I just finished watching a 90 min interview on YouTube

*be

Mithrandir24601

Very few physicists and mathematicians seem to be a 'hero' anywhere outside of universities and science-y businesses :/

That's the whole "mad scientist/nerd" stereotype.

@JohnRennie that's funny, I usually think of presentations as an opportunity to convey technical knowledge, not as opportunities to show off.

@DanielSank Bernardo's final grade depends on this. The sole point of the presentation is to impress the examiner into giving him a great grade.

@JohnRennie I, personally, would not advise anyone to think about showing off when constructing a talk.

8:16 AM

The examiner is not interested in technical details of a basically routine project that he set himself and has probably set before. Bernardo is not trying to communicate technical info to the examiner.

Then his educational system is complete fail. But I think you are likely mistaken.

He's looking for confidence and command of the material, no?

No

He should be thinking about how best to explain the work to the target audience.

what qualities does the "best" explanation have then?

It's too late at night for me to describe a good talk ;-)

Engage the audience.

Motivate the problem, bring the audience into your space so that they feel the same sense of urgency about the problem as you did.

Then construct the solution thoroughly, but not slowly; you don't want to bore people.

Good night

8:25 AM

cu

@user314159 well ok yes, confidence and command of material are important, but Bernardo has that already.

Mithrandir24601

@DanielSank buenas noches (surely you know that one?)

18 hours ago, by user314159

In the interview @yuggib he said the Chinese government forced him to change his major from analytical number theory to algebraic geometry.

@DavidZ do you think that^ still goes on in China?

yo

\o

Mithrandir24601

8:38 AM

Rytsas

how's everyone

chillin, u?

Mithrandir24601

Erm... Good? It's nearly the weekend, within a week my last ever exam will be finished (although I've said that before...), so, yeah, good, thanks :)

same

that's cool, mith

relieffff

though good luck for the exam

Mithrandir24601

@Avantgarde thanks - it hopefully won't be too bad, if I can write quickly enough :P

8:47 AM

which subject/course?

Mithrandir24601

Quantum Computing - it was really interesting, so doing the work's enjoyable, although revision is never exactly fun

I see. Never studied that..

Has it been implemented in practice? And to what extent?

Mithrandir24601

@Avantgarde I first went to lectures in quantum computing 2 years ago now (it was part of third year computer science in my undergrad, so I went for interests sake), so I've been waiting for an exam on it for a fair while now

hm yeah

Mithrandir24601

@Avantgarde Implemented in practice? Yes, but only to a small extent - IBM currently have a 16 qubit ('quantum bit') machine (OK, chip) with a prototype 17 qubit chip, but Google are planning to unveil a chip that will hopefully run some algorithm faster than any classical computer can run an equivalent algorithm for the first time later this year

8:58 AM

that's interesting

so, the hardware for such machines is significantly different than conventional computers?

Mithrandir24601

Yeah - various competing types of qubit exist - Google and IBM are using superconducting qubits, but there's also things like trapped ions (they have very ambitious plans, which are a few years away), photonic (also got ambitious plans a few years away, currently got a 2 qubit chip) and Microsoft are looking at topological quantum computing, which is still very much theoretical. Having said that, the chips are produced in foundries that also create other (classical) chips

(OK, I don't know about all types of quantum chips being produced in the same foundries as classical chips, but of the ones I do know about, they are)

Hmm...that gives a whole new meaning to "casting" metal :-)

Right.

On a quantum scale, I mean.

Bernardo Meurer

9:48 AM

@JohnRennie The presentation is any time between May 29 and June 2.

@JohnRennie You can be my presentation guinea pig :P

@BernardoMeurer squeak, squeak :-)

Bernardo Meurer

@JohnRennie It's sad though, that right after I delivered I figured out how to make it much better

Instead of Using ID's to connect the trips, the stations, the routes, and the timetables I could just have all connected to the stations using pointers

@BernardoMeurer To be fair that frequently happens. When you're working as a programmer you frequently end up having to ship something that (mostly) works rather than something that's perfect.

Bernardo Meurer

This way I don't even need a routes list

In your presentation it's worth having a section that describes future optimisations

Bernardo Meurer

9:51 AM

I'm familiar with that, it's just a shame from an aesthetic POV :P

10:17 AM

As Boltzmann once said Matters of elegance should be left to the tailor and cobbler :P

10:56 AM

[Random] Particle fountains

We knew that, very roughly speaking, a physical process has some probability to occur and it depends on the underlying quantum field (once can calculate the transition probabilities from one state to another via path integrals which sum up all possible paths that connect state A to B)

Now imagine you concentrate a lot of energy momentum at one small region (but not enough to collapse that into a black hole), the process that give rise to heavier particles became more likely. Thus the region in question will be sprewing a shower of particles for a while as the whole system transit to a new …

Well... I guess that's pretty much what happens within accelerators...

(Hopefully I have not misunderstood the rough outline of QFT when making this dedution...)

0

Q: What is this spacetime metric?

Does anyone know whether this metric has been studied before or if it has a proper name? $$ds^2 = -dt^2 + e^{2At} dx^2 + e^{2Bt} dy^2 + e^{2Ct} dz^2$$ i.e. a de Sitter metric which has a different expansion rate in different directions. Or even the more general $$ds^2 = -dt^2 + a^2(t) dx^2 + ...

general-relativity metric-tensor

GR guys may be interested

user228700

11:13 AM

Hi, everyone! :-)

Morning. How're the tonsils?

user228700

Better, thanks :-) Much better, actually.

user228700

Still quite sleepy though.

@Kaumudi.H Excellent! :-) It's hard to take an optimistic view of life when your tonsils hurt!

user228700

How is you doing? :-P

user228700

11:15 AM

@JohnRennie It's true!

@Kaumudi.H Fine. I've finished a boring job that I've been putting off, so I'm taking it easy now until Sunday when I drive down to see my mother.

user228700

Ahh, OK :-)

user228700

Damn, I miss coffee :-(

@Kaumudi.H still avoiding anything that might inflame the tonsils, or is your relative's house a coffee free zone?

user228700

> is your relative's house a coffee-free zone?

user228700

11:17 AM

Correct!

user228700

I had an excellent lunch though! An unlikely combination too; chilli parota and nei roast :-D

@Kaumudi.H I'm contemplating having parathas for lunch today ...

user228700

Ooh, again? Nice! :-) What will u have it with?

There's a firm that sells Indian food in the UK and they do a nice chole.

I've noticed a shop near me has some other stuff of theirs, so I'm thinking of getting that for lunch and eating it with those frozen parathas that are still in my freezer.

user228700

Ooh. Sounds great! :-)

user228700

11:25 AM

I have a nephew now, BTW! He's 5 and I've been spending some time with him; reading him Malayalam stories (with great difficulty), playing and teaching him Monopoly etc. :-)

I've been trying to Google for the stuff I found online, but with no luck so far. I've never heard of nei roast - what is it?

user228700

encrypted-tbn0.gstatic.com/…

user228700

^ It's basically dosa but with extra nei; butter, in Tamil :-)

Aha, a dosa with butter folded round into a cone?

user228700

Precisely! :-)

user228700

11:27 AM

It tasted divine, as u might expect :-)

Extra butter is always good :-)

Actually I might fry the parathas in butter ...

ghee!

@Kaumudi.H I guess your nephew is a bit young for physics :-)

user228700

@JohnRennie Ooooh.

user228700

@Avantgarde Haha, nice pun! :-)

11:30 AM

@Avantgarde I don't have any ghee, but then I don't need a high temperature for frying the parathas so regular butter will do.

:)

user228700

Ghee and butter are the same no, for the most part?

@Kaumudi.H I think butter has more water in it than ghee. So when you're frying with butter you can't get the temperature high until the water has boiled off.

No, they're different. I would've expected you'd know that, Kaumudi

Plus I think ghee has been melted then filtered to remove solids.

user228700

11:33 AM

@Avantgarde ._. Oops.

user228700

@JohnRennie I see. Wokay, thanks! :-)

Anyhow, an Indian restaurant near me does a meal where they put chole on a paratha then fold it over (with the chole in the middle). I might try doing that.

user228700

Ooh, sounds great! :-)

@Avantgarde well ghee and butter are basically the same. Ghee is just butter that's been post-processed.

@Kaumudi.H it'll give me a chance to try the new foods, and finally use up those frozen parathas.

user228700

@JohnRennie Unfortunately, yeah. Besides, he's too fidgety to sit still and learn Physics! :-)

user228700

11:35 AM

@JohnRennie Finally, right! :-) Say, you don't nap during the day?

@Kaumudi.H no. If I nap during the day I find I can't sleep at night.

user228700

Ah, OK. Same here :-/

@JohnRennie Yes, you're right. Ghee is clarified butter. But they smell, taste and look different. Here, at least.

user228700

...unless I'm really sleep deprived :-|

@Avantgarde Ghee is much better for frying because it allows a higher temperature to be reached and it doesn't spit.

user228700

11:38 AM

Brb! Another visit to a different relative :-|

OK :-) I have to go get some petrol anyway in a few minutes.

Back later this afternoon.

YHM BTW - nothing too exciting.

1

Q: why no quantum entaglement in time?

is tehre a math explanation why the quantum entaglement only works in spacial dimension ? if we use Quantum +Relativity shouldn't be able to explain quantum entaglement trhoug time in the same time we can proof that the quantum entaglement in space exists ??

quantum-information

There are two layers to the answer to this question

(let the other guys to answer it)

@JohnRennie Hm, didn't know that, John.

Bernardo Meurer

@JohnRennie So apparently it's not a presentation, but an oral exam

They have my code in paper (48 pages of it!)

And they will

ask me questions about it? I guess

@BernardoMeurer ah OK. Are you allowed to ask what the format of the exam is i.e. do they expect you to talk about the code unprompted or is it strictly question and answer?

Bernardo Meurer

11:43 AM

@JohnRennie It's a bit of the two, they will have specific questions as well as more general ones like, "Justify your data structure desing"

Anyway, your code is great. Just make sure you have answers prepared for all possible why did you do it this way questions.

How many examiners?

Bernardo Meurer

@user314159 3

:O

Bernardo Meurer

@JohnRennie Will do :)

11:45 AM

You better know your stuff.

Bernardo Meurer

There was an "Expected Grade: " Field on the delivery form

I filed with maximum grade, lol, I want to see another kid do that merge sort

@user314159 This is one of the 2 classes this semester where I have an idea of what's going on :P

cool

Google something like encapsulation and code reuse for loads of articles with the sorts of buzzwords you need.

Though I guess you know all this stuff anyway.

Anyway, I have to go get some petrol. Back in a bit.

Bernardo Meurer

Holy smokes

There's a guy maintaining OS/2

He reverse engineers a closed source kernel

and add patches to it

How fucking hardcore does it get?!

arcanoae.com

12:12 PM

How many examiners are you going to have at your thesis defence? @ACuriousMind

Not sure, 2 or 3, I think

All in English, right?

Bernardo Meurer

@ACuriousMind Can I go watch your thesis defense?

It's already sold out :P

@BernardoMeurer I...think you could? I think I can request that no spectators should be present, but usually no one wants to spectate at these things, anyway.

Bernardo Meurer

12:23 PM

@ACuriousMind What day and what time

I don't know yet.

Bernardo Meurer

Hit me up

Maybe I go just for the sake of it :P

Probably some time in September, I guess.

When will you get your certificate?

...how am I supposed to know that? (We don't do graduation ceremonies as you do in the US here, the secretaries just very unceremoniously hand your degree to you when you've done everything that's required :P)

12:32 PM

Are you going to change your username to Dr.CuriousMind :-D

...I'm not getting a PhD yet

It's just a master.

Master Mind then

I guess ACuriousMasterMind would be funny, but I'm confusing people enough already by changing my avatars every so often :P

AMasterfulCuriousMind?

Bernardo Meurer

12:51 PM

@ACuriousMind To me masters should change the name

It sounds like a kung-fu degree

There's also the Head Master at a school.

AccidentalFourierTransform

my handwritten alephs look like swastikas

2

how ironic is that

I think you need to either look up what an aleph or what a swastika is :P

AccidentalFourierTransform

alephwastika

@ACuriousMind how is your understanding of TCS coming along?

1:08 PM

@Danu Pretty well, I'd say

Currently translating a bunch of cohomology computations to a deRham description so I can "see" what actually happens to the fields

Fields being described by cohomology classes?

The massless modes you incur by Kaluza-Klein reduction come from harmonic forms on the manifold you're reducing on

Right, I remember something like that

And in this case, the cohomology was computed "algebraically" and then the physicists just took that and said "okay, we know there's a harmonic form for each of these things", but I want to know which of the harmonic forms from the blocks we're gluing together survive.

It was only recently that I explicitly realized that differential forms are just a geometric/coordinate-free way to speak about solutions of PDE's so it's not that surprising that they may describe fields

@ACuriousMind "blocks" being...?

Bernardo Meurer

1:14 PM

@Danu Lego bricks

The two manifolds one glues together in the TCS are called "building blocks"

Bernardo Meurer

user image

No deep reason behind it, AFAICS

Bernardo Meurer

Me when y'all talk

Not like conformal blocks then @ACuriousMind. I really want to understand what those are, rigorously.

1:16 PM

@Danu Nah, not like those (whatever they are :P)

@ACuriousMind since when do computer scientists care about gluing manifolds together?

@EmilioPisanty ahaha, TCS = twisted connected sum, not theoretical computer science.

@ACuriousMind imma stick with my interpretation

hahahahahha

Kuhnian incommensurability at work

user image

Thank You, But I Prefer it my way

Bernardo Meurer

1:20 PM

King Gizzard & The Lizard Wizard - Rattlesnake (Official Video)

R A T T L E S N A K E

@ACuriousMind So what you're trying to understand is the maps on cohomology from each of the blocks into the sum?

@Danu Yes.

Does it just come from Mayer-Vietoris?

@Danu Yes.

Okay, so not too bad in principle...

In practice maybe shit :D

1:27 PM

Nah, it's really not too bad. I'm just taking care to write everything down in a way that I don't have figure out what the hell I did here when I look at it again in a few days :P

is the MV sensitive to how the sum is twisted? or just the same as the normal connected sum?

Bernardo Meurer

@ACuriousMind Just comment your code

@Danu The twist does play a role, which one expects since the whole purpose of the twist is to make the fundamental group smaller than what the non-twisted gluing would do (I don't think the non-twisted version would be a "connected sum" in the standard sense, but whatever, I'm not the one inventing terminology here :P)

Oh, that's unfortunate terminology :P

1:58 PM

Yo @DanielSank you never got back to me about that unitary operator stuff!

user228700

2:11 PM

@JohnRennie Nothing too exciting?!?!

user228700

I checked and it's great! :-o

@Kaumudi.H good. Let me know if you want anything off the list and it can be arranged when you're back in Chennai.

whoever serially upvoted me

user image

thank you

but I suspect it won't last

user228700

YES!! Thank you!! :-D

@Kaumudi.H It's 22.5C in Chester and I'm sweating like a pig!!

user228700

2:16 PM

@JohnRennie You may expect a short list soon :-P

42C would kill me!

@JohnRennie sounds like a record-breaking temperature, no?

@EmilioPisanty Chester rarely gets very hot. It's mainly the south east of England that has the really high temperatures.

user228700

@JohnRennie Jesus Christ! :-o I'd be shivering!

Bernardo Meurer

Rio gets 50C sometimes

It's horrible

2:17 PM

@JohnRennie yeah, they get all the way to the 25s and 26s =P

@EmilioPisanty I think the south east sees at least high 30s in August.

@JohnRennie I sucks, but as long as (a) it's not too humid and (b) you have a lot of hydration available you get through it.

If I could be bothered I'm sure the data is only a Google away :-)

@JohnRennie yeah, that's correct (been there personally) but it would make making fun of Britain less fun, so I'm ignoring that

I did my graduate work in southern New Mexico and I came to really like the desert. But really hot days had to be managed.

And that's coming from someone who grew up in San Antonio. I had thought I was good at heat, and I am better at it than most people I meet, but there are limits.

2:20 PM

@dmckee I'm your typical Scot - fair hair, blue eyes, pale skin. The Sun and I really don't get along :-)

So England is ideal for me! :-)

user228700

@JohnRennie Ooh, you've blue eyes?! Nice!

@JohnRennie Oh ... I burn at the drop of a hat. The McKee is Scotch-Irish and the other contributions are Welsh and northern German.

I take the light, loose, but covering clothing and a hat approach.

@Danu that's because I didn't understand most of the words in your message.

user228700

I've never met anyone with blue eyes. Most people here have brown/black eyes.

user228700

Well, except exceptionally old people. They always have glassy blue eyes.

2:24 PM

@Kaumudi.H I posted pictures of myself as a spotty youth a while back. My eyes haven't changed colour since :-)

@BernardoMeurer eeeeek!

@JohnRennie so you say.

user228700

@JohnRennie Right, right. It was difficult to discern the color of ur eyes from that picture though.

Do eyes change colour with age? Apart from getting redder of course :-)

Bernardo Meurer

@DanielSank Yeah :P

@JohnRennie Is a hottie

@BernardoMeurer form an orderly queue ladies.

Bernardo Meurer

2:27 PM

Hehehe

MERGE SORT THE LADIES

@BernardoMeurer this conservation could so easily slide rapidly downhill :-)

Bernardo Meurer

@JohnRennie Why? I don't see it :P

user228700

Oh. Ohh. Right.

I meant as in the sclera getting redder. I didn't realise eyes could change to blue with age. I wnder what the mechanism is.

user228700

> sclera getting redder

user228700

2:30 PM

Right, right.

Bernardo Meurer

@JohnRennie Send us a selfie

Aaaaaaah. The blue colour is due to Tyndall scattering. So blue/green eyes are unpigmented.

user228700

Ooh, interesting!

Brown eyes, of the various shades, are produced by various levels of melanin.

So brown eyes can turn blue if you stop producing melanin in the iris.

Well, well, we live and learn.

For some reason I found most of the stuff in h bar recently incomprehensible

O and where is 0celo. Have not seen him recently

2:37 PM

@BernardoMeurer I've to work out how to take a selfie without it making my nose look big. Presumably I need a selfi stick or some other way of increasing the distance to the camera.

He's banned. I asked myself the same question.

Bernardo Meurer

@JohnRennie Selfie sticks are for tourists, just develop a longer arm

Or find an iconic angle

user228700

^

@DanielSank The first message contained the take-away: If it's true for the Pauli matrices then it's true in general.

But yeah, I found the h bar recently contained a lot of liberal arts and not enough food

2:38 PM

I tried to explain why in the second one, but if you don't care about that then you can just disregard it. I can also try to clarify if you'd like: Just tell me what part didn't make sense.

and I still suck at comprehending literacy

@JohnRennie What. The blue is just the absence of pigment? Why do I feel betrayed by that fact?

The amount of pigment in your eyes is sub-par

@ACuriousMind yes according to Wikipedia ...

@Danu I don't have blue eyes :P

2:40 PM

@ACuriousMind Dang it

Laugh of the day:

@Secret Unless you mean you have difficulty understanding the ability to read things, you mean literature, not literacy.

> The Gauss and Codazzi equations have as their duals the Cogauss and Dazzi equations

2

lel

@ACuriousMind I mean something like fiction, novels, classical poety etc. I am not sure what term I can use to refer to these because the word "literature" also refers to academic journal articles

Words can have more than one meaning. Live with it.

user228700

@JohnR: Thanks so much for the list for more than the reason that I can enjoy the films; you've given me s'thing (figuring out which ones to ask for) to do for the next hour! :-)

2:44 PM

But anyway, the recent conversations between JohnRennie and Kaumudi about literature reminds me a similar impression when I read messages between balerka Sen and Danu and 0celo a year ago when they discuss about differential geometry. I guess I need to read more to be able to understand those two streams of conversations

user228700

@Secret About literature? When was that?!

@Kaumudi.H That's the problem with the countryside. Yes it's beautiful, but there's nothing to do!

user228700

Exactly! I could've taken walks but I'm so incredibly tired, you see :-(

@Danu Canonical MO joke thread

May 15 at 15:40, by John Rennie

This is one of the most amazing books I read in a while:

This is one of the many conversation streams

2:48 PM

I like how they're debating the exact relation between mbinatorics and mputer science :P

user228700

@Secret Oh, right.

@Secret We were talking about Fifty Shades of Grey :-)

user228700

Eeeeek!

Bernardo Meurer

@JohnRennie Your picture here took a whole new meaning

BTW last night I read the novelisation of the new Alien Covenant film.

2:49 PM

@ACuriousMind yeah, that one is brilliant

user228700

@JohnRennie Ooh, there's a novelization? How was it?

@Kaumudi.H well ... the Alien films aren't really strong on plot. You go to see them for the scenery.

user228700

Ahh :-/

I so far, among the recent movies, only watched guardians of the galaxy 2

I have yet to squeeze time to watch others

If you want to borrow it even the rubbish broadband youve currently got should be able to manage. But, it isn't very good.

2:53 PM

My family plan to watch that new pirates of the carribean soon

user228700

@JohnRennie Nah. I have two books to finish already! :-) Thanks though.

user228700

@Secret How was it?

> The primary reason Bourbaki stopped writing books was the realization that Lang was one single person.

true dat

@Kaumudi.H I have a spoilerific one sentence and a non spoilerific one. Which one do you want me to say?

user228700

Hmm, the latter. Just in case :-)

2:55 PM

@ACuriousMind Yes, I know. But I found this one myself (in Gray's paper)! :D

"It will make you laugh most of the time"

3

Q: How are Raw Observations Processed to Obtain Pure CMB Data?

I'm confused about how they identify and subtract radiation from unwanted astronomical sources while measuring the Cosmic Microwave Background Radiation. Here's what I initially guessed: The dipole anisotropy is found out by measuring anisotropies $A$, $B$ and $C$ in arbitrary $x,y,z$ directio...

cosmology experimental-physics astrophysics cmb data-analysis

maybe a mod could tell OP to go easy on the edits?

user228700

@Secret Erm...OK!

user228700

I should probably get to stuff I've gots to do. See you all tomorrow, bye! :-)

@Danu Heh. I remember a visual joke of this form: The picture is the typical image of Amor as a winged boy with a bow, lying bleeding on the floor with many arrows stuck in him. The tagline is "Covalentine's Day", but I can't find the actual picture for the life of me.

2:58 PM

Nice

If I ever write a book about category theory, I will TikZ this.

Anonymous

@BernardoMeurer Hi. I'm looking to learn the basics of programming. Any tips on how to start? I've got a 2 month holiday and am feeling bored :P

Anonymous

I know a bit of QBASIC and some string array programs in java

You should start with C

Anonymous

@JaimeGallego How?

@ACuriousMind brownsharpie.courtneygibbons.org/tag/category-theory/page/4

« first day (2395 days earlier) ← previous day next day → last day (2538 days later) »

Transcript for

May '1726

The h Bar

General chat for Physics SE (physics.stackexchange.com). For M...

join this room
about this room

00:00

06:00

12:00

18:00

all times are UTC

site design / logo © 2024 Stack Exchange Inc; legal

mobile