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cmuratori's profile
Casey Muratori
Casey Muratori
Casey Muratori
@cmuratori

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Casey Muratori

@cmuratori

I'm worried that the baby thinks people can't change.

Seattle
caseymuratori.com
Joined March 2009

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    1. Casey Muratori‏ @cmuratori 14 Apr 2020

      Casey Muratori Retweeted Stephen Wolfram

      So, I read this entire post, but the entire thing just sums up to "we think someday we could make a context-free grammar for the universe". Since they _haven't_ yet, I'm not sure what the proposed value-add is here?https://twitter.com/stephen_wolfram/status/1250063808309198849 …

      Casey Muratori added,

      Stephen WolframVerified account @stephen_wolfram
      I never expected this: finally we may have a path to the fundamental theory of physics...and it's beautiful https://writings.stephenwolfram.com/2020/04/finally-we-may-have-a-path-to-the-fundamental-theory-of-physics-and-its-beautiful/ … pic.twitter.com/IVvx8F97SQ
      9 replies 8 retweets 48 likes
      Show this thread
    2. Casey Muratori‏ @cmuratori 14 Apr 2020

      Like there are literally stacks of papers in the computer graphics literature that have precisely these kinds of algorithms their proposing here. We've done this, done this, done this, and done it again over and over. What is the actual contribution supposed to be here?

      5 replies 0 retweets 14 likes
      Show this thread
    3. This Tweet is unavailable.
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    5. Casey Muratori‏ @cmuratori 14 Apr 2020
      Replying to @Jonathan_Blow

      If you go back to the original L-systems paper, it is literally this same thing. They said "we want to simulate cell growth in plants", and they worked on rules until they got something that mirrored observations.

      2 replies 0 retweets 3 likes
    6. Casey Muratori‏ @cmuratori 14 Apr 2020
      Replying to @cmuratori @Jonathan_Blow

      This is an unsurprising result in hindsight, right, because with a context-free grammar for replacements is fairly powerful. You can create rules which will result in a wide variety of input sets.

      1 reply 0 retweets 2 likes
    7. Casey Muratori‏ @cmuratori 14 Apr 2020
      Replying to @cmuratori @Jonathan_Blow

      But saying that it is "the way the universe works" or something is very bizarre, because although, for example, MPEG-4 can use a seemingly bizarre set of codes to magically reproduce what appears to be an exact visual representation of the world, it's _not_ how the world "works".

      4 replies 0 retweets 13 likes
      Casey Muratori‏ @cmuratori 14 Apr 2020
      Replying to @cmuratori @Jonathan_Blow

      So sure - context free geometry replacement grammars can be used to compress all sorts of natural phenomenon into some simple rules so long as you accept a number of constraints, but they don't really add any insight to what we already know.

      10:53 AM - 14 Apr 2020
      • 7 Likes
      • warmist George Leung nanimo(null); Scott Lee 🎮 🎄 Hal Wayland Matthew Williams Joshua Silva
      2 replies 0 retweets 7 likes
        1. New conversation
        2. Casey Muratori‏ @cmuratori 14 Apr 2020
          Replying to @cmuratori @Jonathan_Blow

          They're a compression format for rules, might be another way to say it, and they're also probably lossy. Since context-free grammars _also_ have all sorts of limitations, it also seems likely that they cannot explain the universe properly, otherwise they would work better :)

          2 replies 0 retweets 5 likes
        3. Casey Muratori‏ @cmuratori 14 Apr 2020
          Replying to @cmuratori @Jonathan_Blow

          Anyway, Twitter is not great at explaining this, but hopefully that is the basic gist. So this just seems like another case of Wolfram "rediscovering" something we've known for like 60 years and thinking he made a breakthrough.

          3 replies 0 retweets 8 likes
        4. Show replies
        1. Salim | سليم‏ @salimmj4 15 Apr 2020
          Replying to @cmuratori @Jonathan_Blow

          You're speaking with so much confidence it's unbelievable. Are you saying that finding transition rules that if unrolled for long enough would generate the universe is trivial and does not add anything to our understanding? wow...

          0 replies 0 retweets 0 likes
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