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On countable SFT covers of sparse multidimensional shift spaces
Tekijät: Törmä, Ilkka
Julkaisuvuosi: 2026
Lehti: Theoretical Computer Science
Artikkelin numero: 115755
Vuosikerta: 1066
ISSN: 0304-3975
eISSN: 1879-2294
DOI: https://doi.org/10.1016/j.tcs.2026.115755
Julkaisun avoimuus kirjaamishetkellä: Avoimesti saatavilla
Julkaisukanavan avoimuus : Osittain avoin julkaisukanava
Verkko-osoite: https://doi.org/10.1016/j.tcs.2026.115755
Rinnakkaistallenteen osoite: https://research.utu.fi/converis/portal/detail/Publication/509007498
Rinnakkaistallenteen lisenssi: CC BY
Rinnakkaistallennetun julkaisun versio: Kustantajan versio
A multidimensional sofic shift is called countably covered if it has an SFT cover containing only countably many configurations. In contrast to the one-dimensional setting, not all countable sofic shifts are countably covered. We investigate the existence of countable covers for gap width shifts, where the number of nonzero symbols in a configuration is bounded by a function of the minimum distance between two such symbols. As our main results, we characterize those one-dimensional gap width shifts whose two-dimensional lift is a countably covered sofic shift, and show that a large class of two-dimensional gap width shifts are countably covered.
Ladattava julkaisu This is an electronic reprint of the original article. |
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Author was supported by the Academy of Finland under grant 346566.