The h Bar

ZeroTheHero

01:38

nytimes.com/2019/07/18/science/…

Feigenbaum passed away. I often ask students in my class mech course to write a code and estimate the constant that bears his name...

skullpetrol

09:44

Congrats @JohnRennie on the thrilling worldcup victory.

They're calling it greatest game ever played in one day.

John Rennie

@skullpetrol I must admit that I didn't watch it. I'm not a huge fan of cricket. I was more interested in Lewis Hamilton's win at the British Grand Prix.

I read the reports of the match, and yes it was the closest finish ever in the World Cup.

skullpetrol

The next World Cup in India will have its work cut out to beat that record in 2023.

I hope this year's World Cup of rugby will be as exciting.

The All Blacks should make it to the finals also.

Slereah

10:16

I'm trying to solve the free particle system in every possible formalism I can think of

there is quite a lot of them

bolbteppa

12:33

Classical non-rel: Lagrangian, Hamiltonian, Hamilton-Jacobi.

Classical rel: same. Also whole theory of free EM Fields and free GR fields e.g. Schwarzschild.

Quantum non-rel: Schrodinger, Heisenberg, BRST.

Quantum rel: KG equation, Dirac equation, there is one for every spin above this.... Also free KG field, free Dirac field, free EM field, etc...

Missing things?

ACuriousMind

In order to tell what you're missing you'd have to tell us what you're trying to do :P

skillpatrol

or perhaps, what you're aiming for?

bolbteppa

Path integral

Slereah

13:12

@bolbteppa Basically you can apply a whole bunch of actions, quantization methods, constrain methods and such

Even the classical one has a dumbass constrained action

$$S = \int d\tau \frac{m}{2} \frac{\dot{x}^2}{\dot{t}}$$

Slereah

13:27

I'd like to make like a whole bunch of basic physics problems written in a whole bunch of formalisms

Like simple stuff like free particles, elastic collisions, two body problems, etc etc

Novalium Company

14:25

Pff, I'm still a bit scared math will limit my creativity and out of the box thinking ability. Please prove me wrong.

Slereah

You're 100% correct

never do math

Novalium Company

wut why?

I mean, am I really correct?

@Slereah sarcasm?

ACuriousMind

@NovaliumCompany Why would math "limit your creativity"? It would only limit you if e.g. you started insisting that everything else also has to follow mathematical standards of rigor, but that's entirely up to you.

PM 2Ring

14:46

@NovaliumCompany Did you read that quote from Feynman about the beauty of a flower, that I linked for you the other day?

Ryan Unger

@ACuriousMind 🤨

alarge

@NovaliumCompany Math is a creative subject. Would you be afraid that reading poetry somehow limited your creativity and out of the box thinking ability?

ACuriousMind

@RyanUnger Not available in my font, I only see a unicode box :P

Ryan Unger

@ACuriousMind emojipedia.org/face-with-one-eyebrow-raised

Novalium Company

@PM2Ring Did it now yes

I'll just start learning math and hope it doesn't rig my mind in any way that doesn't favor my entreprenourial goals

ACuriousMind

14:57

@RyanUnger Ah, what a wonderful world we live in where "Emojipedia" is a thing

skillpatrol

why wouldn't it be a thing? :P

PM 2Ring

@NovaliumCompany Oh, good. Yesterday, Loong mentioned that it was the birthday of the astrophysicist Dr Brian May. He has obviously studied mathematics. It doesn't appear to have stunted his creativity. Eg, his guitar solo in Bohemian Rhapsody is widely considered to be one of the epic guitar solos in rock music.

Novalium Company

Oh, ok. But would it limit my entreprenourial thinking in any way?

bolbteppa

It took what nearly 2000 years to progress beyond Euclidean geometry to even Cartesian geometry, and then about centuries to get from Calculus to complex analysis etc, the idea math doesn't involve creativity lol

ACuriousMind

I have no idea what "entreprenourial thinking" is (and I'm not referring to the spelling mistake :P)

Loong

15:06

@ACuriousMind apparently an excuse for not doing your math homework

bolbteppa

It's not like Bill Gates studied math at Harvard or anything

7

PM 2Ring

@NovaliumCompany Maybe. Entrepreneurs are gamblers, and people with mathematical training tend to avoid gambling on things that aren't a sure bet. ;)

bolbteppa

@Slereah take them from L&L where they have them to get it as unified as possible

Slereah

@bolbteppa get what?

skillpatrol

@ACuriousMind it gets better with beachapedia :-)

bolbteppa

15:10

The problems, e.g. they do the same non-relativistic problem relativistically in another book e.g. collisions

Novalium Company

Alright then. The Bill Gates example convinced me. Also Elon Musk has a physics degree sooo

skillpatrol

math has a lot of business applications

Loong

The less common, even worse outcome: "3: [everyone in the financial system] WOW, where did all my money just go?"

Novalium Company

Steve Jobs on the other hand was not a math person. I guess math doesn't make a big difference whether you will succeed as an entrepreneur or not

skillpatrol

entrepreneur

Noun: entrepreneur (plural entrepreneurs)

A person who organizes and operates a business venture and assumes much of the associated risk.
A person who organizes a risky activity of any kind and acts substantially in the manner of a business entrepreneur.
A person who strives for success and takes on risk by starting his own venture, service etc.
entrepreneur m (plural entrepreneurs, feminine entrepreneuse)
entrepreneur (person who organizes and operates a business venture)

Novalium Company

15:17

I see the word risk in every sentence :p

skillpatrol

yup

Novalium Company

It's not all about risk though

skillpatrol

what is it all about?

Novalium Company

Many things. Good ideas, where to apply them. You can't just think of a shitty idea, put all your savings into it and call that entrepreneurship

skillpatrol

I see the word idea a lot :p

Novalium Company

15:21

I'm looking to stimulate my mind in different ways. Math certainly does the job so I'll spend some time exploring it. What's the worst thing that can happen.

Emilio Pisanty

0

Q: I am a pervert please somebody kill me

IAmA pervert........... Somebody kill me u/Deepocd123 Hi guys today i am gonna make a confession. I know everybody's going to abuse me. And it is indeed right. Even i deserve to get punished for this horrendous crime. Today i harassed a girl i forgot about all my morals and did this immoral wor...

abnormal-psychology

That's..... interesting

Novalium Company

what the f*ck

skillpatrol

that's...off-topic?

Novalium Company

that's....lit

ACuriousMind

@EmilioPisanty have you flagged that already?

skillpatrol

15:28

pervert

ACuriousMind

(also, are you taking an interest in psychology lately or how did you stumble across that?)

Novalium Company

@ACuriousMind exactly my thought

Slereah

@skillpatrol what's the appropriate stack exchange for this

Interpersonal skills?

skillpatrol

applied neuroscience at its finest

Novalium Company

@skillpatrol yay, neuroscience

vzn

15:37

lol about the idea of math study hurting somebodies brain. however bolbteppa didnt give more of the story. gates is a harvard dropout. jobs is also a college dropout. and this is not uncommon. there are many billionaires who didnt go to college or dropped out. another big example, larry ellison of oracle. thiel, a colorful character/ billionaire even advocates directly against it. newsweek.com/2017/03/03/…

Novalium Company

ACuriousMind

And then there's Jim Simons who is both an accomplished mathematician and worth billions. You can find examples for every kind of story you want to tell about the relation between formal education and success.

2

vzn

have cited simons here myself, am a big admirer, think hes nearly the worlds most successful quant. actually quantitative finance, a relatively new science, is an example of many Phds getting very, very rich based on very advanced math + science. but anyway think theres a very nuanced/ multidimensional (not 1-dimensional) aspect to the question of the times/ ages, "should I go to college"

ACuriousMind

Although I would caution in general against the idea that people are worth emulating because they are rich.

Novalium Company

I'm learning maths, I've decided. Thanks everyone. Btw differential calculus is pretty interesting actually

vzn

15:42

yes, there are very many unethical + nearly detestable rich people (1 in particular is inundating the headlines lately) and there are new psychological studies that actually measure a decrease in empathy among the rich, just saw an interesting one cited recently...

Novalium Company

I'm still emotionally hurt that Tony Stark died :(((

lol that was so random xD

vzn

rats cant find that reddit psychological study re wealth cited recently but heres something else googled that is a bit eyepopping

Novalium Company

Elon Musk is connecting brains to smartphones. Hacker's midnight fantasies coming true

vzn

They Don’t Just Hide Their Money. Economist Says Most of Billionaire Wealth is Unearned. / evonomics

bolbteppa

(The point was BG took the famously hardest first year math class at Harvard and it didn't somehow magically stifle his entrepreneurial creativity)

vzn

15:56

BG + other billionaires are singular individuals and they have both lessons to emulate and also regard as unrepeatable paths. BGs life is closely aligned with moores law revolution same with Jobs and (singulatarians notwithstanding) moores law is starting to fade, and is likely unrepeatable, a singular trend in history.

jack ma is a newly minted (chinese) billionaire, interesting case study. he got a BA in english. he advocates strongly for educational opportunity, making recent headlines on subj. alizila.com/jack-ma-rural-education-integral-to-chinas-future

skullpetrol

16:21

There's a huge difference between third world billionaires and western billionaires.

The top 5 billionaires in India have more money than half the entire countries' population.

ACuriousMind

@skullpetrol For the US, it's just the top 3. Where the "huge difference"?

Ryan Unger

@ACuriousMind U.S. Billionaires are good and honest people.

skullpetrol

> About 60% of India's nearly 1.3 billion people live on less than $3.10 a day

@ACuriousMind^

vzn

16:38

@RyanUnger lol capitalism as a religion/ belief system? said to a work colleague recently: capitalism doesnt scale well...

ACuriousMind

@skullpetrol If you want to make an actual argument based on that quote, go ahead.

Ryan Unger

@vzn I pray every day to the gods of capitalism

vzn

@RyanUnger lol maybe some of those gods are evil :P

Ryan Unger

you must have the wrong definition of evil

Gyromagnetic

sup hbärs

vzn

16:43

lol all hail the GDP :P

ACuriousMind

@Gyromagnetic reckless worship of late stage capitalism, apparently.

Ryan Unger

I think I'm pretty reckfull, ACM

vzn

@RyanUnger what has capitalism done for you anyway? wondering whats your student debt...) o_O

Gyromagnetic

@ACuriousMind happens hahaha. Capitalism + democracy is basically soft communism.

distributism + monarchy are the true gods

ACuriousMind

@RyanUnger that word hurts my brain

skullpetrol

16:51

reckful

Adjective: reckful (comparative more reckful, superlative most reckful)

(uncommon) Full of careful heed or attention; careful; cautious.
Synonyms: attentive, audient, heedful1845, Allan Freer, The North British review:
Man, in fact, should be reckless in nothing, but reckful in every thing; […]
1994, InfoWorld - Oct 24:
[…] it's tough to call when it's in that gray area between reckless stupidity and reckful insanity.

Ryan Unger

@ACuriousMind Don't you mean CPU

PM 2Ring

Reckful is a perfectly cromulent word.

Ryan Unger

apparently it only has one l

hmm

why though

why does careful only have on l

shouldn't it be carefull

you're full of care

ACuriousMind

@RyanUnger Maybe I'm highly parallelizable and run on GPUs

PM 2Ring

But I agree that we ought to be mindful of the ESL people here, like ACM and vzn.

vzn

16:55

← again notices how weird english is, reckful + wreckful both real words o_O

Emilio Pisanty

@ACuriousMind a friend went from physics to neuroscience and I was curious about whether there was an SE for that

vzn

@PM2Ring that is a wild unsubstantiated rumor in my case.

Emilio Pisanty

That question was top of the front page

ACuriousMind

ah, bummer

Emilio Pisanty

Did a conclusive job of answering my question with a firm "yes, but"

skullpetrol

17:00

The good news is that question is gone.

PM 2Ring

@vzn There's plenty of evidence in the transcripts of this room...

vzn

@PM2Ring think its strange what you regard as "evidence" + think theres strong case against it. have you read my blog at all? + not sure why you think its important. can neither confirm nor deny™ :P

Ryan Unger

lmaooooo

always suspected vzn is a spy

vzn

oh no o_O

Emilio Pisanty

@skullpetrol it's a good thing the oneboxer caught just enough to show how awful the question was while keeping it chat-transcript-safe

Ryan Unger

17:03

@EmilioPisanty it got worse than that?

skullpetrol

:-)

Emilio Pisanty

@RyanUnger yes

Very

Ryan Unger

lol

interesting

skullpetrol

sexually-explicit

Emilio Pisanty

-1

Q: Heisenburg Uncertainty applied to a real vacuum

I was wondering if the reason when you have a candle in a vacuum chamber, and you remove the air, the candle goes out, but is it because the candle's flame is in a definite position inside the chamber. You know the edge of the vacuum, so I'm wondering if you could apply a sonic vibration with a ...

combustion

Oooof

Does that make off-topic?

PM 2Ring

17:05

@vzn That's ok. I'm happy to make allowances for non-native speakers of English. You don't have to tell me what your mother tongue is if you don't want to.

Emilio Pisanty

Or is it just bad?

PM 2Ring

@EmilioPisanty I don't think the OP is trying to ask something non-mainstream. They just have some weird misconceptions about quantum stuff.

ACuriousMind

@EmilioPisanty unclear what you're asking, imo. I've read it twice now and I still have no idea what it's trying to ask

skullpetrol

@Loong good cartoon :-)

vzn

skullpetrol

17:09

Making the data fit^

PM 2Ring

@EmilioPisanty He just edited it. It's worse now. :) I'm still not sure if we can close it as non-mainstream, but I guess Not Clear works.

Loong

@PM2Ring Maybe you should wait a few more edits before closing it. ;-) That candle in a vacuum example is solving more and more problems.

Faraday would be proud.

Ryan Unger

ok it's clearly a troll now, right

skullpetrol

say away from trolls

PM 2Ring

@Loong Good point. I wonder if it's a spherical candle...

Loong

17:23

@RyanUnger hm: chat.stackexchange.com/search?q=ted+booth&user=&room=

vzn

@JMac btw have looked into this over the years and think theres more to it than meets the eye, have mentioned it a few times in this room over the years, but it requires careful/ timeconsuming analysis. someone with engr bkg may be able to appreciate it more...

PM 2Ring

@vzn I suppose it's possible that you are a native speaker of English, but that either you aren't very good at writing it, or your poor writing style is due to laziness. Or for some odd reason you think it's cool to reduce the comprehensibility of what you write...

Ryan Unger

lœl

PM 2Ring

The fifth panel also applies to postmodernists.

vzn

17:39

PM2Ring why dont you take your baseless criticisms elsewhere. its not nice

PM 2Ring

@vzn If you don't want to answer me, that's your prerogative. But if you don't explain yourself, then all I can do is speculate.

@Loong Mere closure doesn't faze this guy, he's made several more edits since it was put on hold. It now looks like he thinks he may have an explanation for dark energy.

Loong

@PM2Ring Yes, I saw that.

PM 2Ring

Mind you, I'm not averse to cellular automata being used to model physical stuff.

Loong

Looks like he has a few deleted questions like that.

> I think a black hole has a vortex inside that sucks in space like a tornado. However, I also think space is being blown as a bundle of straight lines as well into the tip of the tornado (blowing itself is not vortexed).

PM 2Ring

17:56

I have to admire his imagination...

Ryan Unger

18:39

@ACuriousMind what rule did Ted Booth violate?

ACuriousMind

@RyanUnger You know I won't answer that

Slereah

19:43

@Loong ah, the line bundle

bolbteppa

21:15

EM is the theory of a connection $\Gamma = A$, GR is the theory of the metric $g$ whose derivatives then create a connection $\Gamma = g^{-1} (\partial g + ...)$, what consequences does this have

Novalium Company

21:41

Am I doing this right: Integral of v(t) is derivative of x(t). Second integral of a(t) is derivative of x(t). Second integral of v(t) is second derivative of x(t). Am I getting it right?

bolbteppa

No

Novalium Company

:(

what's wrong?

bolbteppa

Watch the Mechanical Universe they explain everything (in the universe)

The Mechanical Universe

The Mechanical Universe... And Beyond is a 52-part telecourse, filmed at the California Institute of Technology, that introduces university level physics, covering topics from Copernicus to quantum mechanics. The series was produced by Caltech and INTELECOM, a nonprofit consortium of California community colleges now known as Intelecom Learning, with financial support from Annenberg/CPB. == Overview == Produced starting in 1982, the videos make heavy use of historical dramatizations and visual aids to explain physics concepts. The latter were state of the art at the time, incorporating almost 8...

Episode 3: Derivatives - The Mechanical Universe

►

The integral of $v(t)$ is $x(t)$, $v(t)$ is the derivative of $x(t)$, the second integral of $a(t)$ is $x(t)$, second integral of $v(t)$ is nothing anybody cares about. $a(t)$ is the second derivative of $x(t)$.