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BagelDaughter's profile
Oatmeal Agitante
Oatmeal Agitante
Oatmeal Agitante
@BagelDaughter

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Oatmeal Agitante

@BagelDaughter

Preoccupied person.

Joined May 2011

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    1. Oatmeal Agitante‏ @BagelDaughter 3 Sep 2016
      • Report Tweet
      Replying to @BagelDaughter

      My goal was to ask if the frontier of humanity's knowledge search is likely to produce "undecidable"s or just "hard"s

      1 reply 0 retweets 0 likes
    2. Oatmeal Agitante‏ @BagelDaughter 3 Sep 2016
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      Replying to @BagelDaughter

      Halting problem uses a trivial construction of undecidability. My intuition is that "nontrivially undecidable" does not exist

      2 replies 2 retweets 3 likes
    3. Frame Of Stack‏ @FrameOfStack 22 Sep 2016
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      Replying to @BagelDaughter

      The Arithmetic Hierarchy gives an infinite hierarchy of classes of undecidability harder than halting. Are all 'trivial'?

      1 reply 0 retweets 2 likes
    4. Oatmeal Agitante‏ @BagelDaughter 23 Sep 2016
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      Replying to @FrameOfStack

      no, not "trivial". But, "contrived"? Not increasing the risk that I will stumble upon an undecidable problem by chance?

      1 reply 0 retweets 0 likes
    5. Frame Of Stack‏ @FrameOfStack 23 Sep 2016
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      Replying to @BagelDaughter

      Ahh.

      1 reply 0 retweets 0 likes
    6. Frame Of Stack‏ @FrameOfStack 23 Sep 2016
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      Replying to @FrameOfStack @BagelDaughter

      How about these? https://en.m.wikipedia.org/wiki/List_of_undecidable_problems …

      1 reply 0 retweets 2 likes
    7. Oatmeal Agitante‏ @BagelDaughter 23 Sep 2016
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      Replying to @FrameOfStack

      I'm not familiar enough with group theory or topology to comment on those. Among the rest, it seems to break down into 2 forms

      1 reply 0 retweets 0 likes
    8. Oatmeal Agitante‏ @BagelDaughter 23 Sep 2016
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      Replying to @BagelDaughter @FrameOfStack

      1. Instantiate the halting problem in X. (trivial) 2. X produces pseudorandom behavior which can't be predicted. (maybe not)

      2 replies 0 retweets 0 likes
    9. Frame Of Stack‏ @FrameOfStack 23 Sep 2016
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      Replying to @BagelDaughter

      Instantiating the halting prob. can be how you *prove* undecidability in probs of interest for other reasons; I've seen that.

      1 reply 0 retweets 1 like
    10. Oatmeal Agitante‏ @BagelDaughter 23 Sep 2016
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      Replying to @FrameOfStack

      in those cases I always feel let down because the halting problem usually isn't a "pragmatic" usage of a system

      2 replies 0 retweets 0 likes
      Oatmeal Agitante‏ @BagelDaughter 23 Sep 2016
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      Replying to @BagelDaughter @FrameOfStack

      yes, not all sentences in first-order logic are decidable, but I'm not interested in using any old sentence, just useful ones

      1:29 PM - 23 Sep 2016
      1 reply 0 retweets 0 likes
        1. New conversation
        1. Frame Of Stack‏ @FrameOfStack 23 Sep 2016
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          Replying to @BagelDaughter

          This line of reasoning seems wrong to me. Do you have reason to think you're interested in a subclass that's decidable?

          1 reply 0 retweets 0 likes
        2. Frame Of Stack‏ @FrameOfStack 23 Sep 2016
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          Replying to @FrameOfStack @BagelDaughter

          I suspect not; so it should at least be reason to think you *may* run into undecidability. You seem to disagree.

          1 reply 0 retweets 0 likes
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