no. 4
The cyclicity problem for the images of Q-rational series
RAIRO - Theoretical Informatics and Applications - Informatique Théorique et Applications, Tome 45 (2011) no. 4, pp. 375-381.

We show that it is decidable whether or not a given Q-rational series in several noncommutative variables has a cyclic image. By definition, a series r has a cyclic image if there is a rational number q such that all nonzero coefficients of r are integer powers of q.

DOI : 10.1051/ita/2011111
Classification : 11B85, 11U05, 68Q45
Mots clés : rational series, images of rational series, decidability 
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     author = {Honkala, Juha},
     title = {The cyclicity problem for the images of {Q-rational} series},
     journal = {RAIRO - Theoretical Informatics and Applications - Informatique Th\'eorique et Applications},
     pages = {375--381},
     publisher = {EDP-Sciences},
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Honkala, Juha. The cyclicity problem for the images of Q-rational series. RAIRO - Theoretical Informatics and Applications - Informatique Théorique et Applications, Tome 45 (2011) no. 4, pp. 375-381. doi : 10.1051/ita/2011111. http://archive.numdam.org/articles/10.1051/ita/2011111/

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