This is what Feynman's PhD thesis looks like 👀
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- Опубликовано: 25 июн 2024
- Unfortunately, the free PDF link to the thesis on the CERN website has recently stopped working. You may find alternate copies through your own library under the title 'The Principle of Least Action in Quantum Mechanics' or published in the book 'Feynman's Thesis' amzn.to/3shuHne
Old CERN link: cds.cern.ch/record/101498/fil...
Feynman's Nobel address: www.nobelprize.org/prizes/phy...
Notes on Classical Mechanics, Lagrangian and Principle of Least Action: www.damtp.cam.ac.uk/user/tong...
Quantum electrodynamics: en.wikipedia.org/wiki/Quantum...
Abraham-Lorentz force: en.wikipedia.org/wiki/Abraham...
Wheeler-Feynman absorber theory: en.wikipedia.org/wiki/Wheeler...
A small series of videos about the math in Feynman's thesis: • Feynman's Thesis: vide...
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✨Music: Lion's Drift - Trevor Kowalski
Timestamps:
0:00 - Intro
1:25 - Thesis table of contents
3:49 - Thesis introduction
8:39 - Least action in classical mechanics
11:16 - Least action in quantum mechanics
14:53 - Patron Cat of the Day 
Наука
Most student’s PHD theses... an improvement on the measurement of some extremely esoteric aspect of 2 specific particle interactions. Feynman’s PHD thesis... rewrite all of quantum electrodynamics.
@ungratefulmetalpansy but now is the Golden Age of A.I and high-level technologies. We are living history as we speak.
@@electrictrooper7386 Maybe. I remember people claiming expert systems were just an inch from 'real intelligence', and at least two other neural net 'golden ages'. But there we have moved the needle, even if we're probably just as far from 'real intelligence' as we ever were.
Most students are indoctrinated with the feminist cancer and political correctness nowadays.
@@LiftOffLife give it a rest...
bond284 Nope, it’s true.
I studied the tripos at Cambridge.
Keeping quiet is why we are in a mess.
The principle of least action is my life's motto.
@@russellinabush5186 Or is it the Feyman term?
'Lazy' is just a negative Russel conjugation for 'efficient.'
The advanced pathway of this energy 'radiation'?
... excluding RUclips comments :)
@@AndreasDelleske lol easier than talking!
Imagine being well on your way to winning a Nobel physics prize at 24. I’m 19 and I don’t even know how boats can float.
Wow 1k. Literally the most attention I’ve ever amassed in any way thank you guys😂
Winning the nobel prize is hard but surviving 2020 is harder
24 is my age now 😳
come up with a corona vaccine
How about this: You figure out how boats can float and I don't kill you. Sound like a good deal? Don't care, get researching!
@UCIH3siny2Q82Jn68lTJ1PJg That is not entirely true because the lift force is equal to d.v, d being the density of the liquid and v being the volume of the object's part that is sunk in the liquid. Let's say we have a ship that has a mass of m. If mg = d.v than the boat floats. So let's say you added some mass to the ship, people. The density of water and the gravitational acceleration stays the same, but the total mass of the ship increases, so v has to increase as well. It sinks even more to float. If you added more and more people to the ship, it will sink completely because the force caused by his mass will be larger than the maximum lift force the water can provide which is basically the entire boat's volume times the density of water. So yeah the total weight of the ship matters. But if we are talking about the literal mass the boat has, than yes; it won't change anything because as you increase the mass you also increase the v as the density of the ship is consistent. I know what you meant and this comment is useless but it is 2 am and I am bored being home so please excuse me.
I use the path integral every chance I get. Canonical quantization is for normies don't @me
Im happy these two channels interact
@ProgM Funny how you're still here and find something utterly useless to write. If you're so interested in looking at something that's worth it how about you shut up about it first and actually do some work in academia for me to believe that you know better.
( _nods quietly_ ) going to pretend like I understood that
@apxo apxo I'm sad, sad he is not alive anymore ... would have asked him questions for his crass answers for which he has become famous or infamous for ... i only read that in Miles Mathis's expositions and Ken Wheeler's videos ... so the big nose here is a big give away ... hahaha
You approximate because you are a physicist
I tried, I really did, but you lost me after "Let's look at the contents page"
lmao...
i watched the whole thing...more like staring at it like a fool.
Ha ha , being in twelfth grade , I was able to survive till the end , understanding and enjoying few intricate derivations leading to those results which Feynman used in the thesis !
@@yashagnihotri6901 here is the attention you want .
ok at least i can conclude that there is less action in everything in those contents :D
@J D he might just be lacking the fundamental knowledge to understand this, how can he be stupid if he lacks knowledge?
Is einstein stupid if he couldn't understand a musical note?
You are a gifted explainer. If you decide to continue your PhD work, you will make a wonderful professor.
I am an electrical Engineer my company has Feynman thesis in display in Library I am fascinated that he worte whole thesis in simple words
The handwritten formulas are just magnificent to look at, especially when you think about how much work went into it
Yah they are so satisfying
Thank you! I just read the wonderful book "Surely You're Joking, Mr. Feynman!" and in it he discusses writing this paper as if he were taking a quick break between other really important projects! XD
And just to think he was only 24, and also joining the Manhattan Project while writing this... wild!
As my father taught me, nothing is hard; some things just take more time.
*if you're smart like everyone in my family is
georgebaggy That’s just plain wrong. Some people won’t have the brain capacity to understand certain things no matter the help or time
@@swe1337swe Not really. That is just a lame excuse people give themselves to justify giving up or not even trying. Those people are just lazy or uninspired. One can learn anything given the motivation and time. That was me in my current field of study in University. Just two years ago I had no interest in it, and that was a few months before I started.
lala hipponen Quite true. We too often easily forget that the bell curve of intelligence tapers off in both directions.
@@seferraziel9534 Of course not! That is a very extreme and sickening example. Also, that is a straw man argument right there. I know that people who are sadly "disadvantaged" cannot perform certain things that their disadvantage hinders them from doing. I am obviously talking about people who do have the capacity to learn and perform, but don't use it. That is a huge majority of people. There are also people who think they want to do something, but deep down they don't want to. That can also hinder them. Motivation is not something you can force, it is just something you have or get naturally.
Amusia is extremely rare, though. I can't teach them music, because I did not learn how to, and I don't want to. I am sure it is difficult or impossible to teach them, it is a cognitive disorder.
The only way to truly see whether or not someone legitimately cannot learn something is through a Physiologist or a diagnosis, but that can take time and patience - years of it, in fact.
@@FloatingJetsam The normal distribution does taper off in both directions. But there's an entire half of it above the mean ordinate value - and residing in that domain are two types of people with thinking ability: those who choose to think, and those who choose not to think.
Incredible! Making so many connections at such a young age! One can only dream of being so intelligent and creative. Great video thank you for taking the time to understand his paper.
WHAT i'm so happy you covered Feynman!!
👍
Oh damn thanks tibees, like i have no clue about physics but you make it somewhat undestandable and I actually unterstood the general topic, like whattt. Thanks tibees :)
"And Feynman would have been 24 when he submitted this." bro I'm 23 and a bit lost in life.
I started PhD at 25. You just have to find your passion.
Most of the humans are at that age, don't be frustrated because of that, and above all don't make the mistake of comparing yourself to anyone but yourself.
Einstein failed his college entrance exams.
Einstein failed a physics class in college.
Einstein graduated in the bottom 20% of his class.
Einstein didn’t get a job in academia until 4 years after his miracle year. 4 years after his special theory of relativity, 4 years after photons, a university finally was like “yeah. Let’s hire that guy”
this is great!!! Very grateful people are still remembering Feynman. He was a pure genius, all the way in his life. He was that elementary school kid scanning trigonometry textbooks to the 24-year-old with a Nobel prize. I will always remember Feynman's joyful personality especially in times like this.
Your voice is the best voice i have ever heard tbh
Tanjim Riju 😍😍😍😍
Educated NewZealanders sound Australian.
THESM1THS Educated New Zealanders sound smarter than that.
Are you hitting on her
@@THESM1THS Sorry, Newzealendish is the weirdest accent on earth.
Thank you for doing this research and sharing it!
I really like your RUclips content! You have a very clear and relaxing voice, structured explanations and expositions, and I appreciate that you popularise these 'older' works by academics! Great video. :D
Thank you so much for this link !!!
I love math and physics, mostly while being explained by others 😃. I really enjoy your vlogs. Most soft spoken person I have listened to so far. 😇
I'm a math PhD, and working from home has been a challenge but this was nice motivation to start my day with. I'm now fired up.
Could you do John Nash's 26 page thesis next?
It’s awesome to hear that you’re pursuing mathematics!
P.S. Will you help me with my *math* homework? Hehe.
Hopefully I'll be doing a double major in Comp. Sci and Applied Math next year! 🙌
@Nissim Levy BS Bachelor of Science
I just commented a second ago about Nash’s thesis 😂. It’s so fantastic that I’ve had a printed copy in my study for re-reading for like 1.5-2 years now. It’s a mess now though.
@@pokeman123451 I'm shocked he has managed to write a 26 page thesis. But I suppose that is a testament to how original it must be. I haven't read it myself. But I've seen PhD thesis's where the introduction and review chapters are close to 100 pages.
Thanks for going over the thesis, and explaining the key concepts!
Thank you Tibees .. for this appreciable effort.
You are very good at condensing complex concepts and then explaining it to an audience member who doesn't specialise in the given field. I would have liked to have a look at Feynman's thesis, but would have been worried I wouldn't understand much. But thanks to this video, I was able to have another glimpse into that legend's thinking ways. Now I want to read it and understand it in depth :)
Thank you, Tibees, for posting this! Seeing it, I firmly believe that the Feynman thesis should be covered in every graduate level QM series.
Most doctoral theses are best mothballed after the degree is awarded - but this is Richard Feynman, after all! An amazing (and curious) character.
It also helped that his advisor, John Wheeler, was quite an amazing character himself.
Fred
Isn’t he the guy that literally came up with the phrase “black hole”?
@@willmungas8964 Yes; John Wheeler that is.
great video, amazing how you simplified it!
What a wonderful job you did! A gifted teacher. I wish the video had been longer. Thanks.
This is so interesting! Thanks!
Excellent video, you are such a great inspiration for future scientists! :)
U r absolutely correct....
Thank you for this very well given review on this thesis, it really opened up my view in physics. Thank you.
Thanks for that exposition. I had some knowledge of these ideas and I've read most if not all of Feynman's books (or lectures). But I found your video very edifying. Thank you.
You are such a beautiful ray of sunshine in these dark times.
I studied the history of science while attending the U of F and I am always amazed at the way some people can see so clearly a different way to explain reality. Now u understanding the thesis you found. Nope. Way beyond me. Thank you for offering it up to us. :-)
So well explained. More Feynman stuff!!
I admire this presentation. I studied these ideas studying Physics in grad school. You made these sometimes recondite notions very accessible. Thankyou. How he broke down these difficult concepts of least action is just beautiful.
Oh good!! The Feynman's Thesis ! Is So exiting to see this thanks Toby 💖⭐
Quite impressive to see RF's _actual_ thesis...understanding it is another story. Also, Simon the cat rules!
Studying classical and quantum mechanics now in undergrad. I've always loved Feynman's demeanour and approach to problems. This video couldn't be timed better, thanks :)
Great presentation! Very nicely done! Thank you!
I am a physics teacher and a fan of Feynman, I have never thought to read his thesis. It will make for a good challenge, thanks.
Nice work, Tibees! 🤗 Please stay safe!
Thanks Tibees . Your all videos become my favourite. Take care yourself from Corona virus and keep it up .
Im so glad I found your channel.
I love your channel. I hope health for you and a quadrillion of thanks for your needful helps.
This is really interesting! Thanks. It never would have occurred to me to try and read his PhD thesis, ... I would have assumed it would be far too technical. I love the substitution arguments, "Oh, you just replace the classical real valued variable with this complex exponential and then it turns out, ..." That was how Schrödinger came up with the wave equation wasn't it?
Tobee you are really vocal in every video and comes out with an interesting topic.
Amazing contribution you doing to educate people around the world !! Thank you from Canada !
During the war, few months before the battle of Stalingrad and the flipping(?) of the war. That's incredible.
He finished his degree while working on the Manhattan Project.
Yes!! Thanks Tibees :)
Very interesting. Glad you made the video. Hope you can do more.
Excellent! really enjoyed it.
You know, every time I watch your video, I get this feeling that maybe someday, you will come up with a solution to a teething problem that affects humanity. I think you are blessed that way!
Spending the quarantine with Tibees learning physics 😍
Before even watching this vid I feel like this is going to depress me by how excellent this 8 years younger than me Feynman's thesis is
I love your videos. Thanks so much for making them.
That was very well done Tibees. I enjoyed that very much.
imagine how long that would have taken to type out
A trained typist would've blasted it out with no problems ... but a two-finger typist, physics Ph.D. student is another matter entirely! :-)
Facebook was nonexistent at that time.
That's why our parent's fingers, at average, were thicker than our generation onwards.
I have noticed that, and I am pretty sure it works in your state or country too.
Is 2050 I neuralinked mine.
I miss those days, when i only interested in physics, and think about the physics problems deeply in every walk of my life.
In high school i came for the school only to see and read the feynman lectures on physics.
I am not even bothered about the year end exams.
And i continually researched so many articles. It was continued.
But after graduation in physics.
I miserably failed entrance exam for Masters in physics.
Really a painful day for me.
Now i quit physics, officially but not in my heart and soul.
Thanks for uploading this video.
Thank You indeed for your inspirational videos...
Tibees, you're wonderful to share an otherwise uncomprehensible document - such a gift. Thank you.
This makes me appreciate order in chaos. Thank you.
I am inspired!
very thankful with you I did not even have idea that was possible to find Feynman's PhD Thesis
thank you for the wonderful rendition... :)
Please review de Broglie paper on wave particle duality. I've heard it is concise and extraordinarily beautiful.
09:31 "There are many possible paths, but only one True Path." ... As Confucius might have said. Or the Buddha. Or Feynman.
@Nissim Levy Hr mentioned three "true paths" in his comment ... no mention of Christianity. How did you get to that point?
Not understanding quantum mechanics does not automatically mean that it's metaphysical.
Feynmann is God?
@@antonioruiz4767 Some people thought he was (and still think he is).
Or Matt Parker "only one true parabola"
Your voice is so comforting
Please post more videos. You have the right vibe with the right content. I read it when I was 24, I dropped physics as a major and switched to engineering.His brilliance convinced me that I need to seek my destiny somewhere other than the realm of giants. Anyhow, still mostly influenced by him in my professional / academic life. I ask myself: what would Richard do to solve this problem? Sometimes, it actually works!
You should do the same with Hugh Everett’s Ph.D thesis which PBS put on line during a Nova about his suggestion there was a multiverse.
@Nissim Levy Source? And why do you think this would be relevant?
@@lenn939 r/whoosh
This is so big brain that I'm getting a headache...
Brilliant! I thoroughly enjoyed this! Such a nice voice!
Thank you for your work.
I was reading his thesis the other day, but all the math just completely confused me.
This somehow gave me motivation to start writing my thesis 🤓
In contrast to the fast-paced taking style, I really am thankful to you for your slow-paced stlyle. It does help be clear.
Very interesting, informative and worthwhile video. Many thanks for the links to the papers.
Thank you so much. I need to have a copy of this on my shelf. I seek out everything I can about what Feynman thought. And even though I have had not college physics corses. Over the last ten years. I have been able to learn quite a bit. Much of it from rewatching all his lectures over and over. I owe it all to RUclips. With out it I would have only had the choices of old fashion linear television.
Non-linear television is much preferable ... :-)
And I struggle with ray optics
It's relaxing listening to her voice on a subject I'm interested in. It helps being calm when learning new things.
Thanks a lot
You did a great job. He is one of my favorite physicists that every time inspired me.
Hmm, me watching this in front of my friends pretending that I understand this.
Have a good look in a mirror...
This again show that classical mechanics is the most important branch in theoretical physics. Lagrangians, hamiltonians and noethers theorem are so powerful
You are a pleasant and gentle person.
Your voice is very relaxing please make more videos during quarantine
I graduated just in time, in December 2019. I aquired a bachelors degree in music (highest score in my promotion). And i’ve been growing and learning ever since!
Stay home and learn physics from Most Beautiful Physicist ✅✌
You did an admirable job! 👏🏻👏🏻👍🏻 Feynman would have been proud.
Good stuff! Thanks for sharing our beautiful Tibees!
I found Paul Dirac's Thesis on Quantum Mechanics much more fascinating!! Due to the fact that it is more fundamental and my own bias of loving powerful mathematics used in understanding the Mathematical structure of the universe.
Please upload a video on Einstein's paper on relativity 😅😅
Yes I support this idea
Agreed
Your explanation is so good! It excite me to learn phisics! Thanks!
Enjoyed watching every second of this video! lookin forward to the next on:)
Only thing I understood was:: stay at home
I prefer being in quarantine 😔
That was a really entertaining look into Feynman's Thesis!
I hope you'r doing OK. Thank You!
7:11 weird flex.
But ok
You gotta hand it to her
I prayed to God to eliminate every nonsensical thing from my life 👍
Now I can't find my PhD Research Proposal doc 😐
Thank you for sharing. I ended up with a graduate degree in pure mathematics, but always wished I had more knowledge of application such as in physics. I suppose had I not been rather strongly disabled I would have studied both.
The first thing that struck me a bit numb was seeing handwritten seemingly complex definite integrals in R. P. Feynman's dissertation. I like many in the 2000's used LateX to turn my hand written version into the version that was published. I remember my thesis very clearly and thought I would never forget all the details. As it turned out I did forget many of the details, but remember it took me four months before I had the notion of what became a theorem and another 2 months to code the entire 43 page thesis with LateX as well as have the required copies printed by a printing facility. A lot of the last two months was just learning to have LateX create the mathematical notation I desired.
Although I did forget the details I can still, 12 years later, roughly relate how it shows the method for placing a specific upperbound on how many convulutions were required to result in, (involving groups having a specific structure and random initial probability mass function), all the possible convuluted outcomes have come close to having a uniform distribution as seen by variation distance being at some fixed point away from zero.
Actually it was rather cool to have worked on this topic and I always think of dropping a glob of black paint in a gallon of white paint and then asking how long do I have to mix the two before a uniform gray begins to be apparent whenever I think of the work. Perhaps the coolest of all was that I came up with how to generalize the applicable group to any number of elements while in a dentist office waiting for my nephew to have his teeth worked on. Hence, I always called the theorem the tooth theorem.
Thank you PBS Space Time's Matt and the things he's covered on there.. that's really the only reason I can follow along. ;-)