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fermatslibrary's profile
Fermat's Library
Fermat's Library
Fermat's Library
@fermatslibrary

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Fermat's Library

@fermatslibrary

A platform for illuminating academic papers. We publish an annotated paper every week. Our chrome extension for arXiv: https://fermatslibrary.com/librarian 

fermatslibrary.com
Joined September 2015

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    Fermat's Library‏ @fermatslibrary 20 Oct 2018
    • Report Tweet
    • Report NetzDG Violation

    You’re left with a friend on a planet in the shape of a big solid sphere 🌍 where communication is impossible. What is the fastest way to meet? You can justify in the comments

    7:33 AM - 20 Oct 2018
    • 214 Retweets
    • 718 Likes
    • Ghostharold170 Miguel Batista Hei Conny Brunnkvist Robert Humphrey Paul Tigner Nikhillesh Sky Raider Çetin Tüker
    195 replies 214 retweets 718 likes
      1. Fermat's Library‏ @fermatslibrary 21 Oct 2018
        • Report Tweet
        • Report NetzDG Violation

        You should move at random and try avoid deterministic strategies, since there's a probability that your friend chooses to move in the exact opposite way and you'll never meet.

        31 replies 48 retweets 632 likes
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      2. kero‏ @Kerollmops 20 Oct 2018
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        Replying to @Sarwagna_Ananta @fermatslibrary

        And how do you know that your friend stay and you move ?

        5 replies 2 retweets 57 likes
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      2. Sr. Guiños‏ @RaijinKaiju 20 Oct 2018
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        Replying to @fermatslibrary

        Move at random. Because taking any other of the deterministic options would mean that there’s an inmense probability that your partner took a different one, so you’re never gonna meet. Think of it as the latitude and altitude lines in the sphere. Now, moving randomly means that:

        2 replies 1 retweet 38 likes
      3. Sr. Guiños‏ @RaijinKaiju 20 Oct 2018
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        Replying to @RaijinKaiju @fermatslibrary

        Whatever option your friend took, you will be more likely to meet him, because you’re describing more possible points for him to meet, think of it as two lines intersecting having much more points in a uniform random distribution (sphere)gives more probability to form thatline.

        1 reply 1 retweet 19 likes
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      2. Jos - Blijf thuis! - vd Geest 👻‏ @jnvdg 20 Oct 2018
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        Replying to @fermatslibrary

        By circumnavigating you have two cross points

        4 replies 0 retweets 39 likes
      3. Sanjay R‏ @ItsRaichura 20 Oct 2018
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        Replying to @jnvdg @fermatslibrary

        If they are travelling a same speed, there are possible scenarios that they'll never meet

        1 reply 0 retweets 47 likes
      4. 11 more replies
      1. Matt Kuzma‏ @MattKuzma 20 Oct 2018
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        Replying to @fermatslibrary

        Start digging.

        0 replies 0 retweets 97 likes
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      1. Akarsh‏ @iakarsh 20 Oct 2018
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        Replying to @fermatslibrary

        Follow predefined protocol

        0 replies 0 retweets 61 likes
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      2. Physics Boyt‏ @PhysicsBoyt 20 Oct 2018
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        Replying to @fermatslibrary

        It says you are left with a friend, so you are already in contact with your friend. That is what I call a loophole.

        1 reply 0 retweets 35 likes
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