[HN Gopher] The Lazy Universe: An Introduction to the Principle ...
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       The Lazy Universe: An Introduction to the Principle of Least Action
        
       Author : lagrange77
       Score  : 7 points
       Date   : 2022-03-29 19:21 UTC (3 hours ago)
        
 (HTM) web link (oxford.universitypressscholarship.com)
 (TXT) w3m dump (oxford.universitypressscholarship.com)
        
       | lagrange77 wrote:
       | Just wanted to share this wonderful book with you. Interesting
       | review: https://aapt.scitation.org/doi/10.1119/1.5024210
        
       | nh23423fefe wrote:
       | after going through
       | https://www.youtube.com/playlist?list=PL2ym2L69yzkamORF9DGWR...
       | 
       | i found i understood action much better. i kept thinking why the
       | hell are the units "phase space" what does this even mean. How is
       | that even connected to h_bar?
       | 
       | But then following along the derivations to define the action and
       | then the mystery kind of goes away. Understanding the machinery
       | makes the magic real, but also evaporates the confusion.
       | 
       | Like minimizing the action is interesting, but the real a-ha for
       | me, was the derivation of the euler-lagrange and see how the
       | functional equation actually works. Following the types, and
       | compiling in my mind, gave the understanding.
        
         | lagrange77 wrote:
         | > Understanding the machinery makes the magic real, but also
         | evaporates the confusion.
         | 
         | Physics and Mathematics in one sentence. Nicely said.
         | 
         | Thanks for the playlist, will definitely look into it, good
         | lectures on variational calculus are rare.
        
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       (page generated 2022-03-29 23:02 UTC)