## $\mathrm{Pal}^k$ Is Linear Recognizable Online

21 Apr 2014  ·  Dmitry Kosolobov, Mikhail Rubinchik, Arseny M. Shur ·

Given a language $L$ that is online recognizable in linear time and space, we construct a linear time and space online recognition algorithm for the language $L\cdot\mathrm{Pal}$, where $\mathrm{Pal}$ is the language of all nonempty palindromes. Hence for every fixed positive $k$, $\mathrm{Pal}^k$ is online recognizable in linear time and space... Thus we solve an open problem posed by Galil and Seiferas in 1978. read more

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Formal Languages and Automata Theory Data Structures and Algorithms

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