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propensive's profile
Jon Pretty
Jon Pretty
Jon Pretty
@propensive

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Jon Pretty

@propensive

Supporting Scala through professional training and open-source software. Responsible for Magnolia, Fury, Scala World and Functional Africa.

Europe
propensive.com
Joined July 2010

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    1. John‏ @chautelly 29 Sep 2019
      Replying to @propensive @m4nl5r

      Is there some Monty Hall-esque solution to this?

      1 reply 0 retweets 2 likes
    2. Jon Pretty‏ @propensive 29 Sep 2019
      Replying to @chautelly @m4nl5r

      I think you could claim that the solution is Monty Hall-esque.

      1 reply 0 retweets 0 likes
    3. Jon Pretty‏ @propensive 29 Sep 2019
      Replying to @propensive @chautelly @m4nl5r

      Sort of.

      1 reply 0 retweets 0 likes
    4. Martin Lechner‏ @m4nl5r 29 Sep 2019
      Replying to @propensive @chautelly

      Based on any form of independent drawing by the people the probability will be close to zero. This means that some property of the game has to be used. I have an idea, but proving that it works is kinda hard... University times are a couple of years back -.-

      1 reply 0 retweets 1 like
    5. Jon Pretty‏ @propensive 29 Sep 2019
      Replying to @m4nl5r @chautelly

      You might be onto something... but I can't be sure. ;)

      1 reply 0 retweets 0 likes
    6. Lander‏ @LanderLo 29 Sep 2019
      Replying to @propensive @m4nl5r @chautelly

      Presuponing the torturer allows the prisoner to rearrange the cards on the envelopes or leaving them stacked in an order that won't be reshuffled before the next prisoner then it is trivial.

      1 reply 0 retweets 0 likes
    7. Jon Pretty‏ @propensive 29 Sep 2019
      Replying to @LanderLo @m4nl5r @chautelly

      No, that's not permitted. Every prisoner is presented with exactly the same envelopes in exactly the same state.

      1 reply 0 retweets 0 likes
    8. Lander‏ @LanderLo 29 Sep 2019
      Replying to @propensive @m4nl5r @chautelly

      Sorry I missed the clarifications, but the "each prisoner...for each" confused me. It must surely mean all prisoners can see the opening of envelopes for the rest of the prisoners, thus being able to map the whole envelope contents with the over 30% survival probability.

      1 reply 0 retweets 0 likes
    9. Martin Lechner‏ @m4nl5r 29 Sep 2019
      Replying to @LanderLo @propensive @chautelly

      Nope. It's not based on someone seeing someone else's openings. @propensive thanks for sharing this, was cool thinking about it.

      1 reply 0 retweets 1 like
    10. Lander‏ @LanderLo 29 Sep 2019
      Replying to @m4nl5r @propensive @chautelly

      Then I'm really looking forward to know how that 30% survival probability is even possible if there is no information sharing of any kind.

      2 replies 0 retweets 1 like
      Jon Pretty‏ @propensive 29 Sep 2019
      Replying to @LanderLo @m4nl5r @chautelly

      Communication is not permitted, but sharing of new information is possible. The choices of which envelopes to open can be made serially.

      10:12 AM - 29 Sep 2019 from Krakow, Poland
      2 replies 0 retweets 0 likes
        1. New conversation
        1. Martin Lechner‏ @m4nl5r 29 Sep 2019
          Replying to @propensive @LanderLo @chautelly

          This might confuse the people. Every prisoner does all his picks 1 by 1 in a row, but can decide on every pick what to pick next.

          1 reply 0 retweets 1 like
        2. Jon Pretty‏ @propensive 29 Sep 2019
          Replying to @m4nl5r @LanderLo @chautelly

          Yep, thanks. I was maybe being overcautious about just giving away the answer. ;)

          1 reply 0 retweets 2 likes
        3. Show replies
        2. New conversation
        1. Lander‏ @LanderLo 29 Sep 2019
          Replying to @propensive @m4nl5r @chautelly

          Mmm could you clarify the distinction between communication and sharing new information? Does "sharing of new information" cover "after their turn returning prisoner shares the opened envelopes and their contents info to the rest of the inmates?"

          2 replies 0 retweets 0 likes
        2. Martin Lechner‏ @m4nl5r 29 Sep 2019
          Replying to @LanderLo @propensive @chautelly

          There is zero communication between inmates. What's clear to you: if you are allowed to pick all others before you most likely picked their number else you would be picked up to be killed...

          1 reply 0 retweets 1 like
        3. Show replies

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