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allgebrah's profile
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@allgebrah

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@allgebrah

silence, THIS

Internet (de, en)
synkretie.net
Joined January 2011

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    1. L.  😷. Ritter‏ @paniq 17 Feb 2019
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      the interesting aspect of reversible CA's is that any "program" built with them that turns an input into an output also, as a side effect, produces an invertible program that can turn the output back into the input.

      1 reply 0 retweets 7 likes
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    2. L.  😷. Ritter‏ @paniq 17 Feb 2019
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      here's the fastest known glider for the SRRCA, one for every axis aligned direction. there are over 90 different spaceships possible, which are able to travel at different angles and speeds.pic.twitter.com/CAIoZUQlFS

      1 reply 1 retweet 7 likes
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    3. L.  😷. Ritter‏ @paniq 17 Feb 2019
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      90° rotators for 6-cycle gliders. each turn completes in 330 cyclespic.twitter.com/THbzDbzN14

      1 reply 1 retweet 13 likes
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    4. L.  😷. Ritter‏ @paniq 17 Feb 2019
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      gliders can't be destroyed, and they can't be trapped (as that would violate reversibility); but they can get stuck at rigid obstacles for long periods of time, which could be used to halt gliders long enough to finish a program.

      2 replies 0 retweets 6 likes
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    5. L.  😷. Ritter‏ @paniq 17 Feb 2019
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      gliders of same phase hitting each other just right can perform a horizontal -> vertical flip in 22 cycles.pic.twitter.com/MyHI1jQsAQ

      3 replies 1 retweet 7 likes
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    6. L.  😷. Ritter‏ @paniq 17 Feb 2019
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      "electrons" can also solve mazes. ;-)pic.twitter.com/eKktyF4iiE

      6 replies 2 retweets 18 likes
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    7. L.  😷. Ritter‏ @paniq 17 Feb 2019
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      apparently it was shown in 1977 that any irreversible d-dimensional cellular automaton rule can be turned into a reversible (d + 1)-dimensional rule. so many features of irreversible CA, such as ability to simulate Turing machines, can be extended to reversible CA.

      2 replies 1 retweet 11 likes
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    8. L.  😷. Ritter‏ @paniq 19 Feb 2019
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      another ruleset for a reversible cellular automaton, the "billiard ball machine". while the rules are fairly simple, which is why i initially dismissed them as boring, one gets interesting behavior inside obstacle courses:pic.twitter.com/PMUVq4jvcy

      2 replies 0 retweets 3 likes
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    9. L.  😷. Ritter‏ @paniq 19 Feb 2019
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      here for example is a (fairly useless) XOR circuit implemented in the BBM-CA.pic.twitter.com/XKUxfGTfGv

      2 replies 0 retweets 7 likes
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    10. L.  😷. Ritter‏ @paniq 19 Feb 2019
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      found another reversible CA called "Double Rotation Rule" which is good for uh...pic.twitter.com/BogYgsMcoK

      2 replies 1 retweet 13 likes
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      '(·)‏ @allgebrah 3 Mar 2019
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      Replying to @paniq

      I suspect it was you who came up with the linked rule and it's super interesting actually, it has inverse gliders from time to time and other things as well https://dmishin.blogspot.com/2013/11/the-single-rotation-rule-remarkably.html?showComment=1550606166625#c7690414334022566085 …pic.twitter.com/kMoYudNzV0

      10:05 AM - 3 Mar 2019
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        1. L.  😷. Ritter‏ @paniq 3 Mar 2019
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          Replying to @allgebrah

          didn't design any rules myself i think

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