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Plinz's profile
Joscha Bach
Joscha Bach
Joscha Bach
@Plinz

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Joscha Bach

@Plinz

FOLLOWS YOU. Artificial Intelligence, Cognitive Architectures, Computation. The goal is integrity, not conformity.

San Francisco, CA
bach.ai
Joined April 2009

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    1. Joscha Bach‏ @Plinz 6 Jan 2018
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      Universal computation is the set of rulesets that allow to implement all rulesets that allow universal computation. I suspect that hypercomputation lies outside of universal computation, but a-causal computation does not, i.e. hypercomputation cannot be implemented.

      2 replies 0 retweets 9 likes
    2. onnlucky 🍀‏ @onnlucky 6 Jan 2018
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      Replying to @Plinz

      I suspect that is wrong. What specifically is hyper computation?

      1 reply 0 retweets 1 like
    3. Joscha Bach‏ @Plinz 6 Jan 2018
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      Replying to @onnlucky

      Hypercomputation is a domain of decidable but only approximately computable problems. For instance, most of geometry is decidable but not computable with finite resources. The three body problem is another well-known example.

      1 reply 0 retweets 0 likes
    4. onnlucky 🍀‏ @onnlucky 6 Jan 2018
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      Replying to @Plinz

      But computation, and the problems you compute on, are two different categories.

      1 reply 0 retweets 0 likes
    5. onnlucky 🍀‏ @onnlucky 6 Jan 2018
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      Replying to @onnlucky @Plinz

      For example, what if I implement a Turing machine by using aperiodic tilings (or some other Penrose ideas) such that running this machine for any significant program is decidable but not computable?

      1 reply 0 retweets 0 likes
    6. Joscha Bach‏ @Plinz 6 Jan 2018
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      Replying to @onnlucky

      Yes, you can use computable models to explore uncomputable domains, such as the real numbers. You can also use such uncomputable constructs to define Turing machines, but you cannot implement them. The set of hypercomputatable functions is a true superset of the computable ones.

      2 replies 0 retweets 0 likes
    7. onnlucky 🍀‏ @onnlucky 6 Jan 2018
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      Replying to @Plinz

      So to your original tweet. Were you implying there could be another kind of compute? Or was it a statement on complexity classes?pic.twitter.com/2EVsZ5yQyB

      2 replies 0 retweets 0 likes
    8. Joscha Bach‏ @Plinz 6 Jan 2018
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      Replying to @onnlucky

      The classically computable universe is the set of mappings between the integers. Traditional physics assumes geometric hypercomputation, i.e. allows the universe to implement continuous functions between the reals. Quantum mechanics allows functions from reals to complex and back

      1 reply 1 retweet 1 like
    9. onnlucky 🍀‏ @onnlucky 6 Jan 2018
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      Replying to @Plinz

      I always think of QM as lazy evaluation, needed to keep the universe computable under time dilation, which was needed to prevent runaway information.

      1 reply 0 retweets 0 likes
      Joscha Bach‏ @Plinz 6 Jan 2018
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      Replying to @onnlucky

      QM is what happens when you consider particles and space to be real and project one into the other.

      5:12 AM - 6 Jan 2018
      1 reply 0 retweets 0 likes
        1. New conversation
        2. onnlucky 🍀‏ @onnlucky 6 Jan 2018
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          Replying to @Plinz

          Not sure if particles are real, only in the sense that water waves are real. But it can be both at the same time.

          1 reply 0 retweets 0 likes
        3. Joscha Bach‏ @Plinz 6 Jan 2018
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          Replying to @onnlucky

          Yes, I think like water waves particles only have an approximate existence. The weird thing is that we are made from particles, so we also only exist approximately, with respect to the substrate. When we see the substrate decohere, it is actually us who are losing coherence.

          0 replies 0 retweets 0 likes
        4. End of conversation

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