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cs.FL2026
Language-Representability: Possibilities and Limitations
Zhidan Feng, Henning Fernau, Pamela Fleischmann +2
The study of word-representability was initiated by the seminal work of Kitaev and Pyatkin in 2008 that has later led to the monograph by Kitaev and Lozin in 2015. In this paper, w…
cs.FL2026
2-Head 2D Returning Finite Automata
Henning Fernau, Benedek Nagy, R. Jennifer Rose +2
We introduce and study a family of two-head finite automata called two head returning finite automata (2-HRFA) operating on rectangular arrays of picture languages, in which both h…