Abstract
Tiling recognizable two-dimensional languages, also known as REC, generalize recognizable string languages to two dimensions and share with them several theoretical properties. Nevertheless REC is not closed under complementation and this implies that it is intrinsically non-deterministic. As result, all subclasses corresponding to different notion of unambiguity and determinism define a hierarchy inside REC. Moreover we show that some definitions of unambiguity are equivalent to corresponding notions of determinism and therefore correspond decidable classes closed under complementation and linear parsing algorithms.
This work was partially supported by MIUR Project ”Aspetti matematici e applicazioni emergenti degli automi e dei linguaggi formali” (2007), by ESF Project “AutoMathA” (2005-2010).
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Giammarresi, D. (2010). A Brief Excursion Inside the Class of Tiling Recognizable Two-Dimensional Languages. In: Gao, Y., Lu, H., Seki, S., Yu, S. (eds) Developments in Language Theory. DLT 2010. Lecture Notes in Computer Science, vol 6224. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-14455-4_2
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