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edwinbrady's profile
Edwin Brady
Edwin Brady
Edwin Brady
@edwinbrady

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Edwin Brady

@edwinbrady

CompSci Lecturer. Go player. Programming language researcher. Idris hacker. Denies knowledge of Whitespace. He/him. http://tinyurl.com/TypeDD 

St Andrews
eb.host.cs.st-andrews.ac.uk
Joined November 2008

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    1. Senior Oops Engineer‏ @ReinH 17 Apr 2019
      • Report Tweet
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      Senior Oops Engineer Retweeted Tony Finch

      The story of computing so far: In the beginning the Turing Machine was invented. This has made a lot of people very angry and been widely regarded as a bad move.https://twitter.com/fanf/status/1118627209982500867 …

      Senior Oops Engineer added,

      Tony Finch @fanf
      Replying to @ReinH
      Turing completeness is too bloody difficult to avoid :-)
      2 replies 7 retweets 38 likes
      Show this thread
    2. Victoria C‏ @ToriconPrime 17 Apr 2019
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      Replying to @ReinH

      turing completeness is definitely cool, but still overrated imo it's a useful abstraction, but it can't actually exist in the real world seeing how far you can go without it is generally more interesting to me

      1 reply 0 retweets 2 likes
    3. Senior Oops Engineer‏ @ReinH 17 Apr 2019
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      Replying to @ToriconPrime

      Some of my favorite languages are not Turing Complete, like Agda and the total subset of Idris /cc @edwinbrady

      1 reply 0 retweets 2 likes
    4. Edwin Brady‏ @edwinbrady 17 Apr 2019
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      Replying to @ReinH @ToriconPrime

      Turing completeness is indeed overrated. But the total fragment of Idris (and Agda) is still Turing complete because you can, e.g., describe a step of a Turing machine, and do that forever via coinduction.

      3 replies 0 retweets 4 likes
    5. Victoria C‏ @ToriconPrime 17 Apr 2019
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      Replying to @edwinbrady @ReinH

      no, you can *define* how it *can be done* forever. actually *doing* it forever is a different issue.

      1 reply 0 retweets 0 likes
    6. Senior Oops Engineer‏ @ReinH 17 Apr 2019
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      Replying to @ToriconPrime @edwinbrady

      but by this strict interpretation, no actually existing system is turing complete

      2 replies 0 retweets 0 likes
      Edwin Brady‏ @edwinbrady 17 Apr 2019
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      Replying to @ReinH @ToriconPrime

      Right. It rules out fun things like, say, minesweeper. (And the fact that this even comes up as a question is why I genuinely think "Pacman complete" is a more useful concept even if it isn't very well defined either.)

      2:50 PM - 17 Apr 2019
      • 1 Like
      • Senior Oops Engineer
      1 reply 0 retweets 1 like
        1. New conversation
        2. Senior Oops Engineer‏ @ReinH 17 Apr 2019
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          Replying to @edwinbrady @ToriconPrime

          I do like Pacman complete! But it has the issue that systems which are capable of performing IO are not the only systems that are worth pondering.

          1 reply 0 retweets 1 like
        3. Edwin Brady‏ @edwinbrady 17 Apr 2019
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          Replying to @ReinH @ToriconPrime

          Oh, definitely. I think of it more as an informal measure of whether a language or system is willing to communicate with the rest of the world somehow.

          0 replies 0 retweets 1 like
        4. End of conversation

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