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Paul Dirac's handwritten notes for his PhD, the first ever on quantum mechanics

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41–50 of 55 posts

Re: Paul Dirac's handwritten notes for his PhD, the first ever on quantum mechanics

#41
post #3

so many threads on hacker news get voted to the top without any comments at all. usually you're supposed to read the article, but in this case i doubt anyone is really capable of understanding it. so in conclusion, aside from this one the article has the appropriate number of comments.

I agree with some of his points. My opinions means shit though.

Re: Paul Dirac's handwritten notes for his PhD, the first ever on quantum mechanics

#42
post #39

Earlier quoted context omitted.

Wait, Feynman wasn't one of the "great names in quantum mechanics"??

Feyman was too young for the really fundamental work on quantum mechanics. He won his Nobel prize for his work on quantum electrodynamics. However, he created the path-integral formulation of quantum mechanics, which can be thought of as another way of describing quantum mechanics.

It's worth mentioning that the path-integral formulation had a seed in Dirac: http://en.wikipedia.org/wiki/Path_integral_formulation

Re: Paul Dirac's handwritten notes for his PhD, the first ever on quantum mechanics

#43
post #9

Earlier quoted context omitted.

Indeed, although some of this is the luck of timing. E.g. Richard Feynman would likely have been one of the great names in quantum mechanics ... if it weren't for the fact he was 8 years old right then. Linus Pauling, born 17 years earlier, became the 20th century's most preeminent chemist in part because he was a fricking genius and writer (many of his books are still useful today), but key was that also in 1926 he…

Wait, Feynman wasn't one of the "great names in quantum mechanics"??

Yes, echoing the others Feynman was too late for the foundational, completely change your view of the universe stuff.

Gamow's Thirty Years that Shook Physics: The Story of Quantum Theory http://www.amazon.com/Thirty-Years-that-Shook-Physics/dp/048... is the standard non-specialist account of this, it starts with Plank right after the turn of the century and is essentially complete in 3 decades, about when Feynman was in high school and teaching himself serious math.

Re: Paul Dirac's handwritten notes for his PhD, the first ever on quantum mechanics

#45

Earlier quoted context omitted.

Indeed, he went to Bristol and Cambridge, whence he developed his relativistic quantum theory. He relocated to Florida towards the end of his life. *edited the part where I assert OP was wrong.

We are splitting hairs here. What is wrong? That his career dawned in Florida?

The 'dawn' part is wrong.

http://www.merriam-webster.com/dictionary/dawn

Re: Paul Dirac's handwritten notes for his PhD, the first ever on quantum mechanics

#46

Earlier quoted context omitted.

Indeed, he went to Bristol and Cambridge, whence he developed his relativistic quantum theory. He relocated to Florida towards the end of his life. *edited the part where I assert OP was wrong.

We are splitting hairs here. What is wrong? That his career dawned in Florida?

In English, "dawn" only occurs in the morning, so when used metaphorically it always refers to the advent of a thing. The word you're looking for is "twilight", which when used metaphorically means the end or decline of a thing. Thus Nietzsche's Götzen-Dämmerung is translated Twilight of the Idols.

There's also the word "dusk", which is the opposite of "dawn", but it tends not to be used metaphorically.

Re: Paul Dirac's handwritten notes for his PhD, the first ever on quantum mechanics

#47
I asked my Dad about Dirac, he never met him but he once wrote him asking for clarification of something in a book, and got a handwritten letter back. He doesn't actually remember what was in the letter, but he does remember that somebody borrowed the letter and never returned it. Pissed him off, so we're going to try to get it back.

Re: Paul Dirac's handwritten notes for his PhD, the first ever on quantum mechanics

#48
post #37
post #32

Earlier quoted context omitted.

Relativistic quantum mechanics typically isn't covered during undergrad. Maybe touched on briefly.

I don't know what university you went to, but it definitely was on my course. Second or third year. The idea that you wouldn't cover relativistic QM in undergrad physics is pretty absurd, and probably indicative of how shallow American undergrad degrees are.

Defensive American undergraduate educated anecdote: my degree was in computer science and I studied this third year. Can't speak for anybody else.

Re: Paul Dirac's handwritten notes for his PhD, the first ever on quantum mechanics

#49
http://ecommons.library.cornell.edu/bitstream/1813/80/34/str...

http://ecommons.library.cornell.edu/bitstream/1813/80/35/str...

http://ecommons.library.cornell.edu/bitstream/1813/80/36/str...

These three lectures by Hans Bethe are really interesting to watch and gives you a historical perspective on the development of Quantum Physics. Given his age, the delivery is a bit slow, but it piques your interest in the subject.

Re: Paul Dirac's handwritten notes for his PhD, the first ever on quantum mechanics

#50
post #37
post #32

Earlier quoted context omitted.

Relativistic quantum mechanics typically isn't covered during undergrad. Maybe touched on briefly.

I don't know what university you went to, but it definitely was on my course. Second or third year. The idea that you wouldn't cover relativistic QM in undergrad physics is pretty absurd, and probably indicative of how shallow American undergrad degrees are.

There are ~2,500 institutions in the U.S granting bachelors degrees, and you're happy to make sweeping generalizations about all of them.
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