We display a complexity notion based on the syntax of a tree series which yields two distinct hierarchies, one within the class of recognizable tree series and another one in the class of non-recognizable tree series.
@article{ITA_2010__44_2_257_0, author = {Bozapalidis, Symeon and Kalampakas, Antonios}, title = {On the syntactic complexity of tree series}, journal = {RAIRO - Theoretical Informatics and Applications - Informatique Th\'eorique et Applications}, volume = {44}, year = {2010}, pages = {257-279}, doi = {10.1051/ita/2010014}, mrnumber = {2674543}, zbl = {pre05717749}, language = {en}, url = {http://dml.mathdoc.fr/item/ITA_2010__44_2_257_0} }
Bozapalidis, Symeon; Kalampakas, Antonios. On the syntactic complexity of tree series. RAIRO - Theoretical Informatics and Applications - Informatique Théorique et Applications, Tome 44 (2010) pp. 257-279. doi : 10.1051/ita/2010014. http://gdmltest.u-ga.fr/item/ITA_2010__44_2_257_0/
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