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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. Frame Of Stack‏ @FrameOfStack 23 Sep 2016
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      Replying to @BagelDaughter

      Ahh.

      1 reply 0 retweets 0 likes
    2. 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
    3. 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
    4. 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
    5. 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
    6. 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
    7. 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 reply 0 retweets 0 likes
    8. 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
    9. 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
    10. Oatmeal Agitante‏ @BagelDaughter 23 Sep 2016
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      Replying to @FrameOfStack

      I'd say that I often have good reason to believe I won't run into the kind of construction the halting problem's proof uses

      2 replies 0 retweets 1 like
      Oatmeal Agitante‏ @BagelDaughter 23 Sep 2016
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      Replying to @BagelDaughter @FrameOfStack

      so, I'm trying to gain intuition for if there's a way for undecidability to "creep up on you"

      1:51 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

          I think so, but maybe not in problems you work on.

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

          It certainly crept up on Hilbert, but even recently I think it's crept up on combinatorialists and the like.

          1 reply 0 retweets 0 likes
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