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1:38 AM
Feigenbaum passed away. I often ask students in my class mech course to write a code and estimate the constant that bears his name...
 
 
8 hours later…
9:44 AM
Congrats @JohnRennie on the thrilling worldcup victory.
They're calling it greatest game ever played in one day.
 
@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.
 
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.
 
10:16 AM
I'm trying to solve the free particle system in every possible formalism I can think of
there is quite a lot of them
 
 
2 hours later…
12:33 PM
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?
 
In order to tell what you're missing you'd have to tell us what you're trying to do :P
 
or perhaps, what you're aiming for?
 
Path integral
 
1:12 PM
@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
$$S = \int d\tau \frac{m}{2} \frac{\dot{x}^2}{\dot{t}}$$
 
1:27 PM
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
 
2:25 PM
Pff, I'm still a bit scared math will limit my creativity and out of the box thinking ability. Please prove me wrong.
 
You're 100% correct
never do math
 
wut why?
I mean, am I really correct?
@Slereah sarcasm?
 
@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.
 
2:46 PM
@NovaliumCompany Did you read that quote from Feynman about the beauty of a flower, that I linked for you the other day?
 
@ACuriousMind 🤨
 
@NovaliumCompany Math is a creative subject. Would you be afraid that reading poetry somehow limited your creativity and out of the box thinking ability?
 
@RyanUnger Not available in my font, I only see a unicode box :P
 
@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
 
2:57 PM
@RyanUnger Ah, what a wonderful world we live in where "Emojipedia" is a thing
 
why wouldn't it be a thing? :P
 
@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.
 
Oh, ok. But would it limit my entreprenourial thinking in any way?
 
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
 
I have no idea what "entreprenourial thinking" is (and I'm not referring to the spelling mistake :P)
 
3:06 PM
@ACuriousMind apparently an excuse for not doing your math homework
 
It's not like Bill Gates studied math at Harvard or anything
7
 
@NovaliumCompany Maybe. Entrepreneurs are gamblers, and people with mathematical training tend to avoid gambling on things that aren't a sure bet. ;)
 
@Slereah take them from L&L where they have them to get it as unified as possible
 
@bolbteppa get what?
 
@ACuriousMind it gets better with beachapedia :-)
 
3:10 PM
The problems, e.g. they do the same non-relativistic problem relativistically in another book e.g. collisions
 
Alright then. The Bill Gates example convinced me. Also Elon Musk has a physics degree sooo
 
math has a lot of business applications
 
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
 
Noun: entrepreneur (plural entrepreneurs)
  1. A person who organizes and operates a business venture and assumes much of the associated risk.
  2. A person who organizes a risky activity of any kind and acts substantially in the manner of a business entrepreneur.
  3. A person who strives for success and takes on risk by starting his own venture, service etc.
  4. entrepreneur m (plural entrepreneurs, feminine entrepreneuse)
  5. entrepreneur (person who organizes and operates a business venture)
 
3:17 PM
I see the word risk in every sentence :p
 
yup
 
It's not all about risk though
 
what is it all about?
 
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
 
I see the word idea a lot :p
 
3:21 PM
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.
 
0
Q: I am a pervert please somebody kill me

user5361IAmA 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...

That's..... interesting
 
what the f*ck
 
that's...off-topic?
 
that's....lit
 
@EmilioPisanty have you flagged that already?
 
3:28 PM
 
(also, are you taking an interest in psychology lately or how did you stumble across that?)
 
@ACuriousMind exactly my thought
 
@skillpatrol what's the appropriate stack exchange for this
Interpersonal skills?
 
applied neuroscience at its finest
 
@skillpatrol yay, neuroscience
 
vzn
3:37 PM
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/…
 
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"
 
Although I would caution in general against the idea that people are worth emulating because they are rich.
 
I'm learning maths, I've decided. Thanks everyone. Btw differential calculus is pretty interesting actually
 
vzn
3:42 PM
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...
 
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
 
Elon Musk is connecting brains to smartphones. Hacker's midnight fantasies coming true
 
(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
3:56 PM
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
 
4:21 PM
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.
 
@skullpetrol For the US, it's just the top 3. Where the "huge difference"?
 
@ACuriousMind U.S. Billionaires are good and honest people.
 
> About 60% of India's nearly 1.3 billion people live on less than $3.10 a day
@ACuriousMind^
 
vzn
4:38 PM
@RyanUnger lol capitalism as a religion/ belief system? said to a work colleague recently: capitalism doesnt scale well...
 
@skullpetrol If you want to make an actual argument based on that quote, go ahead.
 
@vzn I pray every day to the gods of capitalism
 
vzn
@RyanUnger lol maybe some of those gods are evil :P
 
you must have the wrong definition of evil
 
sup hbärs
 
vzn
4:43 PM
lol all hail the GDP :P
 
@Gyromagnetic reckless worship of late stage capitalism, apparently.
 
I think I'm pretty reckfull, ACM
 
vzn
@RyanUnger what has capitalism done for you anyway? wondering whats your student debt...) o_O
 
@ACuriousMind happens hahaha. Capitalism + democracy is basically soft communism.
distributism + monarchy are the true gods
 
@RyanUnger that word hurts my brain
 
4:51 PM
Adjective: reckful (comparative more reckful, superlative most reckful)
  1. (uncommon) Full of careful heed or attention; careful; cautious.
  2. Synonyms: attentive, audient, heedful1845, Allan Freer, The North British review:
  3. Man, in fact, should be reckless in nothing, but reckful in every thing; […]
  4. 1994, InfoWorld - Oct 24:
  5. […] it's tough to call when it's in that gray area between reckless stupidity and reckful insanity.
 
@ACuriousMind Don't you mean CPU
 
Reckful is a perfectly cromulent word.
 
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
 
@RyanUnger Maybe I'm highly parallelizable and run on GPUs
 
But I agree that we ought to be mindful of the ESL people here, like ACM and vzn.
 
vzn
4:55 PM
again notices how weird english is, reckful + wreckful both real words o_O
 
@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.
 
That question was top of the front page
 
ah, bummer
 
Did a conclusive job of answering my question with a firm "yes, but"
 
5:00 PM
The good news is that question is gone.
 
@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
 
lmaooooo
always suspected vzn is a spy
 
vzn
oh no o_O
 
@skullpetrol it's a good thing the oneboxer caught just enough to show how awful the question was while keeping it chat-transcript-safe
 
5:03 PM
@EmilioPisanty it got worse than that?
 
:-)
 
@RyanUnger yes
Very
 
lol
interesting
 
-1
Q: Heisenburg Uncertainty applied to a real vacuum

Ted BoothI 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 ...

Oooof
Does that make off-topic?
 
5:05 PM
@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.
 
Or is it just bad?
 
@EmilioPisanty I don't think the OP is trying to ask something non-mainstream. They just have some weird misconceptions about quantum stuff.
 
@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
 
@Loong good cartoon :-)
 
5:09 PM
Making the data fit^
 
@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.
 
@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.
 
ok it's clearly a troll now, right
 
say away from trolls
 
@Loong Good point. I wonder if it's a spherical candle...
 
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...
 
@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...
 
lœl
 
vzn
5:39 PM
PM2Ring why dont you take your baseless criticisms elsewhere. its not nice
 
@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.
 
@PM2Ring Yes, I saw that.
 
Mind you, I'm not averse to cellular automata being used to model physical stuff.
 
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).
 
5:56 PM
I have to admire his imagination...
 
6:39 PM
@ACuriousMind what rule did Ted Booth violate?
 
@RyanUnger You know I won't answer that
 
 
1 hour later…
7:43 PM
@Loong ah, the line bundle
 
 
2 hours later…
9:15 PM
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
 
9:41 PM
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?
 
No
 
:(
what's wrong?
 
Watch the Mechanical Universe they explain everything (in the 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...
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 $x(t)$.
 
@NovaliumCompany it’s easier to think in terms of the derivatives, then remember integration reverses differentiation
the rate of change of distance (speed) is obviously the derivative of distance etc
 
10:00 PM
@bolbteppa Just watched that an it helped so much. Everything is clear!
@JakeRose Yep, got that. I'm just trying to make some sense of integrals
I might watch the whole mechanical universe thing. I hope they have integrals too.
Whatever, 1PM, time for bed
 

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