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- W4287273085 abstract "Empirical, theoretical and historical aspects of Post's problem of tag from 1921 are explored. Evidence of strong computational irreducibility is found. Despite their deterministic origin, the lengths of successive sequences generated seem to closely approximate random walks. All 10^25 smallest initial conditions are found to eventually halt, although sometimes in > 6*10^11 steps. Implications of the Principle of Computational Equivalence are discussed, along with examples of identifiable computational capabilities of tag systems. Various minimal examples of complex behavior are found, including a less-biased analog of the 3n+1 Collatz problem. There is also discussion of the history of Emil Post and of tag systems in the context of ideas about the foundations of mathematics and computation." @default.
- W4287273085 created "2022-07-25" @default.
- W4287273085 creator A5022077412 @default.
- W4287273085 date "2021-03-11" @default.
- W4287273085 modified "2023-09-27" @default.
- W4287273085 title "After 100 Years, Can We Finally Crack Post's Problem of Tag? A Story of Computational Irreducibility, and More" @default.
- W4287273085 doi "https://doi.org/10.48550/arxiv.2103.06931" @default.
- W4287273085 hasPublicationYear "2021" @default.
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