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@article{958260, author = {Klíma, Ondřej}, article_number = {20}, doi = {http://dx.doi.org/10.1016/j.disc.2011.06.013}, keywords = {Piecewise testable languages; Syntactic congruence}, language = {eng}, issn = {0012-365X}, journal = {Discrete Mathematics}, title = {Piecewise Testable Languages via Combinatorics on Words}, volume = {311}, year = {2011} }
TY - JOUR ID - 958260 AU - Klíma, Ondřej PY - 2011 TI - Piecewise Testable Languages via Combinatorics on Words JF - Discrete Mathematics VL - 311 IS - 20 SP - 2124-2127 EP - 2124-2127 SN - 0012365X KW - Piecewise testable languages KW - Syntactic congruence N2 - A regular language L over an alphabet A is called piecewise testable if it is a finite Boolean combination of languages of the form B a1 B a2 B ... B al B, where a1,... ,al are letters from A and B is the set of all words over A. An effective characterization of piecewise testable languages was given in 1972 by Simon who proved that a language L is piecewise testable if and only if its syntactic monoid is J-trivial. Nowadays, there exist several proofs of this result based on various methods from algebraic theory of regular languages. Our contribution adds a new purely combinatorial proof. ER -
KLÍMA, Ondřej. Piecewise Testable Languages via Combinatorics on Words. \textit{Discrete Mathematics}. 2011, vol.~311, No~20, p.~2124-2127. ISSN~0012-365X. Available from: https://dx.doi.org/10.1016/j.disc.2011.06.013.
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