Aperiodic finite state automaton
An aperiodic finite-state automaton (also called a counter-free automaton) is a finite-state automaton whose transition monoid is aperiodic.
Properties
[edit]A regular language is star-free if and only if it is accepted by an automaton with a finite and aperiodic transition monoid. This result of algebraic automata theory is due to Marcel-Paul Schützenberger.[1] In particular, the minimum automaton of a star-free language is always counter-free (however, a star-free language may also be recognized by other automata that are not aperiodic).
A counter-free language is a regular language for which there is an integer n such that for all words x, y, z and integers m ≥ n we have xymz in L if and only if xynz in L. For these languages, when a string contains enough repetitions of any substring (at least n repetitions), changing the number of repetitions to another number that is at least n cannot change membership in the language. (This is automatically true when y is the empty string, but becomes a nontrivial condition when y is non-empty.) Another way to state Schützenberger's theorem is that star-free languages and counter-free languages are the same thing.
An aperiodic automaton satisfies the Černý conjecture.[2]
References
[edit]- ^ Schützenberger, Marcel-Paul (1965). "On Finite Monoids Having Only Trivial Subgroups" (PDF). Information and Control. 8 (2): 190–194. doi:10.1016/s0019-9958(65)90108-7.
- ^ Trahtman, Avraham N. (2007). "The Černý conjecture for aperiodic automata". Discrete Math. Theor. Comput. Sci. 9 (2): 3–10. ISSN 1365-8050. Zbl 1152.68461. Archived from the original on 2015-09-23. Retrieved 2014-04-05.
- McNaughton, Robert; Papert, Seymour (1971). Counter-free Automata. Research Monograph. Vol. 65. With an appendix by William Henneman. MIT Press. ISBN 0-262-13076-9. Zbl 0232.94024.
- Sonal Pratik Patel (2010). An Examination of Counter-Free Automata (PDF) (Masters Thesis). San Diego State University. — An intensive examination of McNaughton, Papert (1971).
- Thomas Colcombet (2011). "Green's Relations and their Use in Automata Theory". In Dediu, Adrian-Horia; Inenaga, Shunsuke; Martín-Vide, Carlos (eds.). Proc. Language and Automata Theory and Applications (LATA) (PDF). LNCS. Vol. 6638. Springer. pp. 1–21. ISBN 978-3-642-21253-6. — Uses Green's relations to prove Schützenberger's and other theorems.