Geodesic
On the expressive power of the shuffle operator matched with intersection by regular sets
RAIRO - Theoretical Informatics and Applications - Informatique Théorique et Applications, Tome 35 (2001) no. 4, pp. 379-388
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We investigate the complexity of languages described by some expressions containing shuffle operator and intersection. We show that deciding whether the shuffle of two words has a nonempty intersection with a regular set (or fulfills some regular pattern) is NL-complete. Furthermore we show that the class of languages of the form L∩R, with a shuffle language L and a regular language R, contains non-semilinear languages and does not form a family of mildly context- sensitive languages.

Classification : 68Q15, 68Q45
Keywords: formal languages, shuffle, space complexity 
@article{ITA_2001__35_4_379_0,
     author = {J\c{e}drzejowicz, Joanna and Szepietowski, Andrzej},
     title = {On the expressive power of the shuffle operator matched with intersection by regular sets},
     journal = {RAIRO - Theoretical Informatics and Applications - Informatique Th\'eorique et Applications},
     pages = {379--388},
     year = {2001},
     publisher = {EDP-Sciences},
     volume = {35},
     number = {4},
     mrnumber = {1880806},
     zbl = {0994.68084},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ITA_2001__35_4_379_0/}
}
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Jȩdrzejowicz, Joanna; Szepietowski, Andrzej. On the expressive power of the shuffle operator matched with intersection by regular sets. RAIRO - Theoretical Informatics and Applications - Informatique Théorique et Applications, Tome 35 (2001) no. 4, pp. 379-388. http://geodesic.mathdoc.fr/item/ITA_2001__35_4_379_0/