Closed Position Set: Difference between revisions
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* [https://github.com/Nathan-Fenner/bb-simple-n-gram-cps bb-simple-n-gram-cps] in Rust by Nathan Fenner | * [https://github.com/Nathan-Fenner/bb-simple-n-gram-cps bb-simple-n-gram-cps] in Rust by Nathan Fenner | ||
* [https://github.com/ccz181078/Coq-BB5/blob/main/CoqBB5/Deciders/Decider_NGramCPS.v Decider_NGramCPS.v] in | * [https://github.com/ccz181078/Coq-BB5/blob/main/CoqBB5/BB5/Deciders/Decider_NGramCPS.v Decider_NGramCPS.v] in Rocq by mxdys | ||
[[Category:Deciders]] | [[Category:Deciders]] | ||
Latest revision as of 09:03, 25 August 2025
Closed Position Set (CPS) is a Closed Set decider invented by Skelet and introduced to the bbchallenge.org community by savask. Since that introduction, there are many variations of the decider that have been used, notably "ngram CPS" which was used in the Coq-BB5 proof.
Information
- The closed position set decider, reverse-engineered from Skelet's program: savask's Oct 2022 Haskell implementation of CPS with extensive descriptive comments.
- bb-simple-n-gram-cps: Nathan Fenner's n-gram CPS description and code
- Thoughts on Closed Position Set: Shawn Ligocki's investigation into the connection with CTL (regular languages).
Implementations
Traditional CPS:
- Turing.hs: in Haskell by savask
- skelet_cps.rs in Rust by Pavel Kropitz
- CPS.py in Python by Shawn Ligocki
- skeletcps.py in Python by Mateon1
n-gram CPS:
- bb-simple-n-gram-cps in Rust by Nathan Fenner
- Decider_NGramCPS.v in Rocq by mxdys