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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. Alvaro Videla‏ @old_sound 18 Dec 2013
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      "Unlike math, software can't be objectively, formally verified to be correct. " brb, changing industry

      5 replies 12 retweets 5 likes
    2. David Cantrell‏ @DrHydeous 18 Dec 2013
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      Replying to @old_sound

      @old_sound @edwinbrady ‘strue. Even if you can verify the software (which is usually impractical) the spec it was written to can’t be.

      1 reply 0 retweets 0 likes
    3. Edwin Brady‏ @edwinbrady 18 Dec 2013
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      Replying to @DrHydeous

      @DrHydeous @old_sound It's more complicated than that though. Some bits of spec, like "never access an invalid resource" are pretty clear.

      1 reply 0 retweets 0 likes
    4. David Cantrell‏ @DrHydeous 18 Dec 2013
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      Replying to @edwinbrady

      @edwinbrady @old_sound in real world software that's not clear, because what's invalid for whom when is Complicated.

      2 replies 0 retweets 0 likes
    5. Edwin Brady‏ @edwinbrady 18 Dec 2013
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      Replying to @DrHydeous

      @DrHydeous "Array access always in bounds" "Null pointers never dereferenced" "Will halt" - not industry ready yet, but we *can* do this.

      1 reply 0 retweets 0 likes
    6. David Cantrell‏ @DrHydeous 18 Dec 2013
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      Replying to @edwinbrady

      @edwinbrady none of that stuff matters when you have a spec that is unclear or even contradictory. Which is always.

      2 replies 0 retweets 0 likes
    7. Edwin Brady‏ @edwinbrady 18 Dec 2013
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      Replying to @DrHydeous

      @DrHydeous If you think verifying those things is pointless, I never want to use your code. And you're just being dismissive, so I'll stop.

      1 reply 1 retweet 0 likes
    8. David Cantrell‏ @DrHydeous 18 Dec 2013
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      Replying to @edwinbrady

      @edwinbrady you're missing my point. Little technical problems like that are insignificant compared to pesky humans writing rubbish specs.

      1 reply 0 retweets 0 likes
      Edwin Brady‏ @edwinbrady 18 Dec 2013
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      Replying to @DrHydeous

      @DrHydeous I see. But they are different problems. I realise rubbish specs are hard to tackle, but that wasn't the original point.

      4:30 AM - 18 Dec 2013
      1 reply 0 retweets 0 likes
        1. New conversation
        2. David Cantrell‏ @DrHydeous 18 Dec 2013
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          Replying to @edwinbrady

          @edwinbrady the original point was about objective formal verification of correctness. The measure of correctness is meeting the spec.

          2 replies 0 retweets 0 likes
        3. Edwin Brady‏ @edwinbrady 18 Dec 2013
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          Replying to @DrHydeous

          @DrHydeous And specs exist on many levels. Some harder to verify than others, some vaguer than others. It's complicated.

          0 replies 0 retweets 0 likes
        4. End of conversation

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