Abstract
In this paper we investigate the complexity of planarity of knot diagrams encoded by Gauss words, both in terms of recognition by automata over infinite alphabets and in terms of classical logarithmic space complexity. As the main result, we show that recognition of planarity of unsigned Gauss words can be done in deterministic logarithmic space and by deterministic register automata. We also demonstrate generic results on the mutual simulations between logspace bounded classical computations (over finite alphabets) and register automata working over infinite alphabets.
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Lisitsa, A., Potapov, I., Saleh, R. (2011). Planarity of Knots, Register Automata and LogSpace Computability. In: Dediu, AH., Inenaga, S., Martín-Vide, C. (eds) Language and Automata Theory and Applications. LATA 2011. Lecture Notes in Computer Science, vol 6638. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-21254-3_29
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DOI: https://doi.org/10.1007/978-3-642-21254-3_29
Publisher Name: Springer, Berlin, Heidelberg
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