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drossbucket's profile
Lucy Keer
Lucy Keer
Lucy Keer
@drossbucket

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Lucy Keer

@drossbucket

Some crackpot. Interested in 'mathematical intuition', whatever that is.

Bristol, UK
drossbucket.wordpress.com
Joined June 2017

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    1. Lucy Keer‏ @drossbucket 13 Nov 2018
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      The original walk is here: https://www.bristolcivicsociety.org.uk/bristol-bridges-walk/ … (new version at https://reallygross.de/ops/bridgewalk  as there are now more bridges!) Now the interesting bit for me is how much of the work was just defining the problem:pic.twitter.com/2ejPqmLgr9

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    2. Lucy Keer‏ @drossbucket 13 Nov 2018
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      Euler's solution involved a creative act of seeing-as, abstracting landmasses as nodes and bridges as lines. But once he'd done that, 18th-century Königsberg maps pretty cleanly onto the problem.pic.twitter.com/A8m3FhyNJo

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    3. Lucy Keer‏ @drossbucket 13 Nov 2018
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      Modern Bristol however is a mess. It's roughly two islands in a river, like Königsberg, but there's also two little islets off the west island, and a tributary branching off the river. Also there are a LOT of bridges:pic.twitter.com/nKavotTKPW

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    4. Lucy Keer‏ @drossbucket 13 Nov 2018
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      More importantly, there are a bunch of decisions to be made about what counts as a bridge. This is purpose-dependent: rail- and car-only bridges don't count in this solution because the whole point is to be able to walk it.

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    5. Lucy Keer‏ @drossbucket 13 Nov 2018
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      Then you have to decide whether bridges like these are two bridges or one bridge. (In this case they all get counted as two.)pic.twitter.com/JudF3BRAvd

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    6. Lucy Keer‏ @drossbucket 13 Nov 2018
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      Finally you have to decide how big the bridges have to be to count. The two bottom bridges off the islet count in this image. The top ones are little lock gates and are excluded.pic.twitter.com/1dgATEzXeW

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    7. Lucy Keer‏ @drossbucket 13 Nov 2018
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      Anyway after spending way too much time on this I think I actually have to walk it some time. Though a new bridge is being built, so the route might completely change by the time I get to it!

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    8. Charlie El. Awbery a.k.a. Rin’dzin Pamo‏ @_awbery_ 13 Nov 2018
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      Replying to @drossbucket

      I would love to do that walk with you some time!

      1 reply 0 retweets 1 like
    9. Lucy Keer‏ @drossbucket 13 Nov 2018
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      Replying to @_awbery_

      We should do it! Though it's a few years since I walked anything over 20 miles, so I'd probably be pretty tired and grumpy by the end!

      1 reply 0 retweets 1 like
    10. Charlie El. Awbery a.k.a. Rin’dzin Pamo‏ @_awbery_ 13 Nov 2018
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      Replying to @drossbucket

      It could be done in parts on different days maybe. We might want to take longer to include the coffee and cake stops.

      1 reply 0 retweets 1 like
      Lucy Keer‏ @drossbucket 13 Nov 2018
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      Replying to @_awbery_

      Yes, those are important, and the instructions do helpfully include some pub stops too... (I do also fancy doing it in one day, but that's going to be hard in daylight hours for the next few months anyway)

      2:07 PM - 13 Nov 2018
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      • Charlie El. Awbery a.k.a. Rin’dzin Pamo
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        2. David Chapman‏ @Meaningness 13 Nov 2018
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          Replying to @drossbucket @_awbery_

          Rin’dzin is very modestly not mentioning that she’s run the long version of the Green Man circuit in one day: https://www.greenmanultra.co.uk 

          1 reply 0 retweets 2 likes
        3. Lucy Keer‏ @drossbucket 13 Nov 2018
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          Replying to @Meaningness @_awbery_

          Impressive! OK, *you* will have no problem walking that in daylight hours, but I will need more cake stops that I can currently fit in.

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        2. Charlie El. Awbery a.k.a. Rin’dzin Pamo‏ @_awbery_ 13 Nov 2018
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          Replying to @drossbucket

          I am leaving the country tomorrow. Hoping to visit again late Spring next year, so am thinking ahead. But if you decide to give it a go in the meantime, I would love to hear about it.

          1 reply 0 retweets 1 like
        3. Lucy Keer‏ @drossbucket 13 Nov 2018
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          Replying to @_awbery_

          I'll let you know if I do! Hope your journey goes well tomorrow :)

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