no. 2
Generalizations of Parikh mappings
RAIRO - Theoretical Informatics and Applications - Informatique Théorique et Applications, Tome 44 (2010) no. 2, pp. 209-228.

Parikh matrices have become a useful tool for investigation of subword structure of words. Several generalizations of this concept have been considered. Based on the concept of formal power series, we describe a general framework covering most of these generalizations. In addition, we provide a new characterization of binary amiable words - words having a common Parikh matrix.

DOI : 10.1051/ita/2009021
Classification : 68R15
Mots clés : Parikh mapping, Parikh matrix, formal power series, Prouhet-Tarry-Escott problem, subword, amiable words 
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     author = {\v{C}ern\'y, Anton},
     title = {Generalizations of {Parikh} mappings},
     journal = {RAIRO - Theoretical Informatics and Applications - Informatique Th\'eorique et Applications},
     pages = {209--228},
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     url = {http://www.numdam.org/articles/10.1051/ita/2009021/}
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Černý, Anton. Generalizations of Parikh mappings. RAIRO - Theoretical Informatics and Applications - Informatique Théorique et Applications, Tome 44 (2010) no. 2, pp. 209-228. doi : 10.1051/ita/2009021. http://www.numdam.org/articles/10.1051/ita/2009021/

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