Fixed points of endomorphisms of certain free products
RAIRO - Theoretical Informatics and Applications - Informatique Théorique et Applications, Volume 46 (2012) no. 1, pp. 165-179.

The fixed point submonoid of an endomorphism of a free product of a free monoid and cyclic groups is proved to be rational using automata-theoretic techniques. Maslakova's result on the computability of the fixed point subgroup of a free group automorphism is generalized to endomorphisms of free products of a free monoid and a free group which are automorphisms of the maximal subgroup.

DOI: 10.1051/ita/2011125
Classification: 20M05,  20F10
Keywords: endomorphisms, fixed points, free products
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Silva, Pedro V. Fixed points of endomorphisms of certain free products. RAIRO - Theoretical Informatics and Applications - Informatique Théorique et Applications, Volume 46 (2012) no. 1, pp. 165-179. doi : 10.1051/ita/2011125. http://www.numdam.org/articles/10.1051/ita/2011125/

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