The h Bar - 2017-12-15 (page 1 of 3)

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12:29 AM

@knzhou I have a half-decent template.

It is decidedly not flashy.

Look at my github repositories.

1:02 AM

user image

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1:42 AM

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2:24 AM

Kepler-90 is a G-type main sequence star located about 2,545 light-years (780 pc) from Earth in the constellation of Draco. It is notable for having a planetary system that has an equal number of observed planets as the solar system. On 14 December 2017, NASA and Google announced the discovery of an eighth planet, Kepler-90i, in the Kepler-90 system: the discovery was made using a new machine learning method developed by Google. == Nomenclature and history == Prior to Kepler observation, Kepler-90 had the 2MASS catalogue number 2MASS J18574403+4918185. It has the designation of KIC 11442793 in...

I am more interested in the details of the planets of this system. It does seemed to have more mini neptunes than ours

user228700

3:17 AM

The Project For Awesome 2017 begins today at Noon Eastern!!

5:25 AM

Last night dream introduce a weird entity: A mobile moving reference frame.

Consider the floor, square out a region, then make it scroll forward as if that section is taken from a scene in motion from a movie. Now imagine that square region itself, still scrolling, is translating forward at some velocity. The result is like a mobile treadmill made of a fragment of reality

(Animation to illustrate that coming soon)

In the dream, such weird entity was used by the wizards in the harry potter world so that two people moving at different speeds will be moving in pace because the faster guy is walking on such treadmill of scrolling reality and that piece itself is moving forward with a velocity matching the slower person

o.o

In theory, I think the effects by this weird entity is plausible to be recreated in our real world, by having a pad like treadmill that has only millimetre thickness which is mobile

Anonymous

@JohnRennie Should I do the updates it's showing in the app store? (ubuntu)

One interesting extension to the dream's idea will be imagine what happens when the scrolling is done at relativistic velocities, will it get length contracted and time dilated

5:44 AM

@Blue yes I would do.

Ubuntu does updates like Windows does.

Anonymous

Okay!

user228700

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user228700

Whoa.

I must admit I have watched, and enjoyed, the Spongebob Squarepants film.

Only once though!

user228700

@JohnRennie :-)

user228700

5:49 AM

171 is too high a number to watch by a single person in a single year!

I watched all of the first two series as well. I started watching the third series but the writers were running out of ideas so I gave up.

user228700

I see. I have never watched a single episode of it, I'm afraid.

user228700

Cartoon Network FTW(, not Nickelodeon)!

@Kaumudi.H if you're ever feeling sufficiently bored I might allegedly have copies of the first two series :-)

user228700

:-) OK, I will be sure to remember that!

6:17 AM

hi, everybody

Anonymous

hi

Здравствуй

блядь

Hi.

Anonymous

What's this obsession with Russian ? :P

I like it.

It is a wonderful language.

I practice on DuoLingo every day.

A couple weeks ago I was in L.A. and was able to read a sign at a Russian bakery!

Hmm, I intend to learn German sometime soon.

(where sometime soon varies from a year to 10 years)

Anonymous

6:26 AM

@Sid Don't become the next Paracetamol :D

Anonymous

Look what happened to him

@Sid You're in college, right?

@DanielSank Freshman year, yes.

@Sid I will give you un-asked-for advice.

Take language classes.

College language courses can be truly excellent and there are usually programs to get you abroad so you can really absorb the language (and have fun!).

I took a language course every single semester of college and I will tell you it was some of the best time I've ever spent on anything.

Because I did that, I can now speak Spanish well, Greek ok, and Russian kinda-sorta ok.

Your ability to learn language decreases as you age. Do it now.

yes, I think we do have open Elective courses. I was thinking about taking one of the language courses. Thanks for the advice. :-)

Anonymous

6:35 AM

Hmm, this looks pretty interesting: users.ece.utexas.edu/~aalu/research%20-%20page%203.htm (The first 4 papers)....since 2014 it seems not much work has been done in this area

If you can make a small, wideband, microwave circulator without magnetism, I can mostly guarantee you that you will be very appreciated by the superconducting qubit community.

If you can do with it with magnetism, that's fine too.

Anonymous

I have been asked to select any one or two materials and study their properties (like DFT calculation, band gap calculation, etc). It should be something original. I was looking at these metamaterials and spinotronics materials mostly (however, I have only limited knowledge about these things)

Anonymous

@DanielSank "small, wideband, microwave circulator without magnetism"...interesting...I will read about it

user228700

I would actually love to learn Sanskrit more deeply than I did in high school but its scope is exceedingly limited, these days. Nobody in the whole world (except a small community located in a village in Mangalore, I hear) speaks it anymore.

@Blue Can you explain what you mean by "two materials"?

@Kaumudi.H Can you go there for a few months when school is off?

user228700

6:43 AM

Months? No, I doubt that.

user228700

(Also, hey! :-)

@Kaumudi.H I don't think that would be particularly helpful to you...

Of course, unless you have very high nationalistic sentiments and feel it is essential to preserve the culture, language and bla bla bla, then, you could spend time to learn that

@Kaumudi.H Why not?

Anonymous

@DanielSank Say analyzing the properties of a certain material whose magnetic and electric responses are negative (thus producing negative refractive index)

Anonymous

Earlier they used an arrangement of copper rings

6:48 AM

@Blue That's only possible with active pumping, right?

Oh wait I might be mixing up real and imaginary parts.

Anonymous

@DanielSank I don't think active pumping is necessary for negative refractive index

@Sid Well, I don't think nationalism is necessarily associated with learning Sanskrit

A lot of the major modernist artists knew it

Dawood ibn Kareem

Hello all.

Eliot/Joyce/etc

@BalarkaSen I mean, it's not at all useful for "normal" people. If it is your passion to know, then, sure, it's a wonderful language to learn

Dawood ibn Kareem

6:58 AM

@Kaumudi.H Being able to talk to people is not the only purpose of learning a language. I'm very glad that I studied Latin at high school, and I wish I had taken it further.

@DawoodibnKareem It may not be the only reason, but it's a strong one for many people.

For example, I actually decided not to learn Chinese because the courses focus so much on reading/writing.

I don't care about literacy nearly as much as I do about speaking.

Some people respond to this by asking me "Well don't you want to read the menu at the restaurant?"

No, I'd rather just talk to the wait staff and ask what's good.

user228700

(I'm sorry, I'm a little distracted at the moment; attempting to learn to identify nodes in an electrical circuit)

Dawood ibn Kareem

@DanielSank Sure, but Kaumudi was talking about Sanskrit. You're very unlikely to find someone whose only spoken language is Sanskrit.

@Kaumudi.H Good for you :-)

A wise use of time.

@DawoodibnKareem Perhaps not, but it would rather cool to do so.

@knzhou to my knowledge you don't, much

Dawood ibn Kareem

7:01 AM

Yes. Once electric circuits make sense, you'll never look back!

^

My current cv is in word

@EmilioPisanty See star board.

:41761565 I quite appreciated the flexibility

@DawoodibnKareem You can understand quantum field theory if you understand feedback circuits!

@EmilioPisanty Of what, Word?

7:03 AM

@DanielSank I'm allergic to Computer Modern

user228700

@DanielSank: BTW, the following is a perfect example of attempts to reduce world-suck:

Dawood ibn Kareem

@DanielSank No. I am a counterexample. I understand feedback circuits. I do not understand QFT.

user228700

4 hours ago, by Kaumudi. H

The Project For Awesome 2017 begins today at Noon Eastern!!

CM in a cv? ugh, not for me

@DawoodibnKareem I said you can, not that you automatically do.

@EmilioPisanty So change the font.

7:03 AM

@DanielSank yeah, surprisingly enough

I like TeX because I put the various sections in their own documents and then just include the ones relevant to the job I'm looking at.

dat modularity tho

Dawood ibn Kareem

@DanielSank Hmm, good point.

@DanielSank admittedly changing fonts in latex has gone gown from ridiculously hard to just very hard

@Kaumudi.H Woah! But how is the suck actually reduced?

Dawood ibn Kareem

@DanielSank You used to be able to do that in Word too. I don't know if you still can. Microsoft continually remove all the useful features, and replace them with pointless ornamental crap.

7:05 AM

I guess this is just a central point for various suck-reductionists to communicate?

user228700

@DanielSank Did you visit the website?

@Kaumudi.H Yes, and read some of it.

It doesn't actually say what they do.

Like I said, it sounds like a central point to share other suck-reducing tools.

@DawoodibnKareem I will never, ever depend on proprietary software again as much as I can help it.

@DanielSank it's a nice idea, but open office sucks

user228700

@DanielSank:

user228700

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user228700

7:09 AM

You too can donate now!

@EmilioPisanty What do I need OpenOffice for?

user228700

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user228700

Woohoo!

@Kaumudi.H Oooooh, they redistribute the donations?

user228700

Precisely!

7:10 AM

Got it.

Redistribute to whom?

user228700

This 2-minute video should explain it neatly.

@DanielSank put a pin on that, I need to get rolling

Giving a talk in a few hours

user228700

Last year, for the first day, each dollar was matched by The Gates Foundation, if I'm not wrong (which I often am!).

@EmilioPisanty A pin?

What the... why is my post showing my resume template starred?

Anonymous

7:12 AM

@BalarkaSen Are you there? I'm probably making some embarrassing error here

user228700

@JohnR: Would it be OK, you think, to star my message about The Project For Awesome, or would it be like I'm forcing this down people's throats?

@Kaumudi.H I've starred it. If you meant pin it, I probably shouldn't do that. We tend to only pin posts that are directly relevant to the PSE.

user228700

No, I meant star, not pin. Thanks! :-)

One of our biggest customers has a major server outage. Servers crashed and burning all over the place! Oh my goodness! I've spent the last hour trying to see what's wrong, but I can't get remote access to any of the affected servers.

user228700

Oh, God! :-o

7:20 AM

Oh well. Time to hand it over to our engineers. I don't think there's any more I can do remotely.

user228700

:-/

Now I shall go and change my underwear :-)

user228700

Lol.

Anonymous

How does server outrage affect underwear ?

Anonymous

LOL

Anonymous

7:22 AM

It burned, wow

Anonymous

Hope you're okay

user228700

That was hyperbole, I believe...

In every server room there is a box with a glass panel, and on that box is a notice:
IN CASE OF EMERGENCY SMASH GLASS.

Inside that box is a pair of clean underpants :-)

Anonymous

@JohnRennie Lol. I see. They planned everything very carefully (in case of emergency) :P

Anonymous

I will donate 50% of my first salary to SciHub and Libgen. They're literally saving me 1000s of bucks

Dawood ibn Kareem

7:36 AM

@EmilioPisanty It doesn't suck that badly. It's adequate.

Oh dear. I went out for 15 minutes. I came home and we're discussing John Rennie's underwear. This clearly isn't the chat room I thought it was.

@DawoodibnKareem :-)

There's a massive server outage at work. It's one of those Oh s**t moments!

@JohnRennie Why do they have underpants in there?

@Sid jokes don't really work if you have to explain them ...

I am an idiot...

Failure to spot that John is not being serious, but is just making another of his smutty jokes, doesn't make you an idiot - just normal :-)

Anonymous

7:48 AM

@Sid It's not you, John has a weird sense of humor. :D

Anonymous

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Anonymous

It's another of those jokes

@JohnRennie That depends on whom you consider normal.

@Sid I'm normal of course. The rest of you should be locked up for your own safety.

Mithrandir24601

@JohnRennie You're normal relative to the set of retired physicists in Cheshire with a rep > 100k on PSE :P

Anonymous

7:54 AM

"The mathematics underpinning transformation optics is similar to the equations that describe how gravity warps space and time,"

I like to think I'm normal according to all the metrics that matter. Well, I like to think that ... :-)

Anonymous

This seems cool

Anonymous

Transformation optics

Transformation optics applies metamaterials to produce spatial variations, derived from coordinate transformations, which can direct chosen bandwidths of electromagnetic radiation. This can allow for the construction of new composite artificial devices, which probably could not exist without metamaterials and coordinate transformation. Computing power that became available in the late 1990s enables prescribed quantitative values for the permittivity and permeability, the constitutive parameters, which produce localized spatial variations. The aggregate value of all the constitutive paramete...

@JohnRennie I like to think that I am one of the greatest geniuses that ever lived on this planet. That doesn't make it true, does it?

Look, it's my fantasy world! You keep out of it! :-)

7:57 AM

@DawoodibnKareem I guess if you squint then Writer is about passable

Impress is simply not up to the task, though

Ah, that major server outage appears to be due to Kaspersky anti-virus

@JohnRennie How does that happen?

For some reason the Kaspersky update released yesterday has killed all the servers it's running on.

Damn russkies!

Mithrandir24601

@Blue Yep, this is very true :)

@Sid Kaspersky has probably misidentified one of the core Windows files as a virus and deleted it. This has happened before with AV programs.

Anonymous

8:03 AM

@Mithrandir24601 :) I was reading this paper. There are so many terms which I don't understand. Trying to extrapolate from Wikipedia :P

Dawood ibn Kareem

@EmilioPisanty If all you want to do is write, then yes. The spreadsheet part (I can't remember what it's called) is a bit awkward, as are some of the other bits and pieces.

@Blue Ah but at least it has nice pictures.

@JohnRennie Is that normal? I mean, I would imagine AntiVirus programs to be more efficient

Anonymous

Mhm. The idea is that for a certain mathematical function on input waveform we get a corresponding output waveform. And the operation is done completely by the material itself, due to its specific structure

Mithrandir24601

@Blue it does take a few papers to get used to reading more papers, then there are also papers that seem to do everything they can just to make things more obscure :/

@Sid well no, it's obviously not normal for an AV program to kill the server it's running on :-) It's a cock-up by Kaspersky. But these things to happen occasionally.

Mithrandir24601

8:10 AM

@Blue yah :)

Hello friends

Mithrandir24601

@Slereah ni hao

user228700

@Slereah Hello, friend :-P

@Mithrandir24601 OK, rub it in then :-)

user228700

@JohnR: How come you're not wearing a hat?

8:20 AM

@Kaumudi.H I've only got three hats because I'm not very active on the main site at the moment.

user228700

Ah, I see.

I decided to abstain from hats until I get my act together and get a few more.

user228700

Cool :-)

user228700

It has been months since I last answered or asked a question, so I don't think I'm getting any.

Why does Daniel Sank list his high school awards when he has a PhD

8:22 AM

@Kaumudi.H to be fair you've had a few other things to do :-)

user228700

:-) True.

I changed my avatar so that the scarf and the spectacles actually fit the face. It looked weird in that previous identicon

Mithrandir24601

@JohnRennie What? Have I not told you that I was in China having an amazing time last week?

:-)

8:47 AM

And now, following this mornings trauma, I urgently need another coffee!

Mithrandir24601

Have some ecoffee: ☕

hmmm Mithrandir went to China?

Mithrandir24601

@CooperCape Yep :D

waaaiit...

2 days ago, by Mithrandir24601

@CooperCape nihao!

very... suspicious

9:31 AM

what's the limit of string theory to QFT anyway

Is it the string tension constant

taken to some limit

user228700

@JohnRennie I want one, too, dang it!

Well make one then! Your gran must have a kettle to hand ...

user228700

No coffee powder, I'm afraid.

Well sit her on the scooter and tell her to go get some :-)

user228700

:-)

Mithrandir24601

9:41 AM

@Kaumudi.H ☕

user228700

Haha, thanks!

How is the electrical engineering revision going?

user228700

Poorly.

user228700

It's OK, as long as I keep at it!

It's often hard to sustain momentum over two weeks of exams. The last exam tends to suffer.

user228700

9:44 AM

Hmm, well, NO, I will do my best!

I don't know of any solution other than to just force yourself to carry on :-(

user228700

Which is exactly what I'm doing! :-)

user228700

Thanks, John!

"Calabi–Yau manifolds are shapes that satisfy the requirement of space for the six "unseen" spatial dimensions of string theory"

O so the whole target space isn't Calabi Yau

Mithrandir24601

@JohnRennie On the other hand, two weeks of exams is considerably less mentally destructive than everything crammed into a few days

9:50 AM

@Mithrandir24601 I'm not so sure about that.

As I recall Cambridge tended to cram all the exams into a week. Two three hour exams a day. I found that suited me fine.

Mithrandir24601

@JohnRennie That destroyed me physically as well as mentally - I'd walk out of an exam in the morning and would be almost physically unable to eat as the sheer amount of writing meant that my hands just shook uncontrollably (I have a tremor) :( It was awful

(this obviously just made everything much, much more stressful)

user228700

I mean, how the frick am I supposed to just get this intuitively:

user228700

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user228700

Doing origami with electrical circuits, pshhh.

Mithrandir24601

@Kaumudi.H ... I may not have sent you enough coffee, that looks incredibly dull: ☕☕☕☕☕

user228700

9:58 AM

:-P Thanks!

@Mithrandir24601 it was a long time ago, but my memory was that as soon as the exam started I switched into superconcentration mode and the three hours were over before I realised.

But, for the record, I feel in no hurry to repeat the experience!

user228700

So, does any of you actually know this stuff? 'Cause I have a quick question... :-/

Mithrandir24601

@JohnRennie Hmm... It's the bit between the exams, where it felt that there was no rest that got to me :(

@Kaumudi.H I can't help I'm afraid. I never did the circuit analysis/Kirchoff's rules stuff.

user228700

Oh, wow, I see.

Mithrandir24601

10:05 AM

@JohnRennie The list of things I would rather do before those exams again is rather long :P

@Kaumudi.H You know the rule! "Don't ask about asking, just ask."

user228700

Never mind, I think I got it :-) Thanks.

user228700

@JohnR: Did you ever do any electronics?

user228700

(Oh, BTW, my touchpad is almost kaput :-/)

Mithrandir24601

@Kaumudi.H (I know you're not asking me, but I did some electronics in the 'hardware practical' part of 1st year CS)

Obviously, this means I've totally forgotten the little I knew :P

@Kaumudi.H Eek! What's the problem with the touchpad?

user228700

10:21 AM

@JohnRennie Wut...it seems to have fixed itself!

user228700

It was jittery before, the cursor, but it's not, anymore.

See, you only have to mention my name and laptops fix themselves :-)

user228700

@Mithrandir24601 :-) Hahaha, I see.

user228700

@JohnRennie WHAT IS THIS SORCERY

My secret is out - I am the god of laptops.

Mithrandir24601

10:23 AM

@Kaumudi.H It's obviously the magic smoke

I just caught myself idly trying to work out what that resistor mass would actually be, and realized I had self-nerd-sniped.

2

user228700

Lol.

user228700

@JohnRennie :-/ Hmm ::strokes invisible beard::

user228700

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user228700

Oh, God, this is going to give me nightmares.

It can be drawn without any crossings, but only in four dimensions and on a non-simply connected manifold.

user228700

10:27 AM

Are you joking or are you joking? 'Cause I think you're joking.

No, I'm absolutely serious

(this may not be entirely true)

Well I mean, it can also be drawn without crossing in 3 dimensions

1 hour later…

12:00 PM

i like the taste of caramel flans

Captain Bohemian

12:13 PM

what does it mean to say that a subbundle is preserved by the Levi-Civita connection?

Anonymous

@Kaumudi.H That is actually intuitive. Just look at symmetries :)

Anonymous

C,E;H,G; are mirror points

Anonymous

So you can just fold the circuit about the horizontal line

Anonymous

Then replace all parallel resistances with equivalent resistances.

Anonymous

Finally you get two series O-A-G and G-F-B. Replace that with equivalent series resistance .

12:19 PM

@Kaumudi.H Yeah, that happens with my laptop as well. I think it's probably because of dirt or something. And as it has happened a lot of times, I have learnt to fix it as well...

12:30 PM

@BalarkaSen @0celo7 what's the general definition of a submanifold, is it like $\iota : N \hookrightarrow M$

Anonymous

@Sid Done watching the first 2 lectures?

Or do inclusion maps have to be injective

Anonymous

The first one was rather short

and hence that wouldn't cover some immersions

Prathyush Poduval

@Blue You mean the intro and supervised learning right?

Anonymous

12:31 PM

@PrathyushPoduval Yes. The intro was too short. :P

Anonymous

I'm coming at around 9pm

Anonymous

If you wish you can go ahead and do the 3rd lecture also

Prathyush Poduval

@Kaumudi.H Do you still have to do this shit? These types of problems are useless....

@Blue I did the first 2 yesterday night

Anonymous

@PrathyushPoduval Nice!

@DanielSank that looks perfect!

12:48 PM

@Blue yes but I can't be free at 9 tonight. Apparently it's my friend's birthday and I forgot. :/

So, I have to make some amends at the moment

Anonymous

@Sid Oh, so when will you return?

@Blue no idea. Probably half past 9 or 10

Anonymous

@Sid Okay, 10 is fine with me

Anonymous

Meanwhile I'll do something else

Where are the topologists when you need them

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The h Bar

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