On language equations with concatenation and various sets of Boolean operations

Okhotin, Alexander

doi:10.1051/ita/2015006

Okhotin, Alexander ¹

¹ Department of Mathematics and Statistics, University of Turku, 20014 Turku, Finland.

RAIRO - Theoretical Informatics and Applications - Informatique Théorique et Applications, Tome 49 (2015) no. 3, pp. 205-232.

Résumé

Systems of equations of the form $X_{i} = ϕ_{i} (X_{1}, . . ., X_{n})$ , for 1 ⩽ i ⩽ n , in which the unknowns $X_{i}$ are formal languages, and the right-hand sides $ϕ_{i}$ may contain concatenation and union, are known for representing context-free grammars. If, instead of union only, another set of Boolean operations is used, the expressive power of such equations may change: for example, using both union and intersection leads to conjunctive grammars [A. Okhotin, J. Automata, Languages and Combinatorics 6 (2001) 519–535], whereas using all Boolean operations allows all recursive sets to be expressed by unique solutions [A. Okhotin, Decision problems for language equations with Boolean operations, Automata, Languages and Programming, ICALP 2003, Eindhoven, The Netherlands, 239–251]. This paper investigates the expressive power of such equations with any possible set of Boolean operations. It is determined that different sets of Boolean operations give rise to exactly seven families of formal languages: the recursive languages, the conjunctive languages, the context-free languages, a certain family incomparable with the context-free languages, as well as three subregular families.

Reçu le : 2015-06-15
Accepté le : 2015-09-21

MR Zbl

DOI : 10.1051/ita/2015006

Classification : 68Q45, 06E30, 68R99
Mots-clés : Language equations, Boolean operations, Post’s lattice

Affiliations des auteurs :

Okhotin, Alexander ¹

¹ Department of Mathematics and Statistics, University of Turku, 20014 Turku, Finland.

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Okhotin, Alexander. On language equations with concatenation and various sets of Boolean operations. RAIRO - Theoretical Informatics and Applications - Informatique Théorique et Applications, Tome 49 (2015) no. 3, pp. 205-232. doi : 10.1051/ita/2015006. http://www.numdam.org/articles/10.1051/ita/2015006/

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