| Issue |
RAIRO-Theor. Inf. Appl.
Volume 46, Number 1, January-March 2012
Special issue dedicated to the 13th "Journées Montoises d'Informatique Théorique"
|
|
|---|---|---|
| Page(s) | 165 - 179 | |
| DOI | https://doi.org/10.1051/ita/2011125 | |
| Published online | 23 November 2011 | |
Fixed points of endomorphisms of certain free products
Centro de Matemática, Faculdade de Ciências, Universidade do
Porto, R. Campo Alegre
687, 4169-007
Porto,
Portugal
pvsilva@fc.up.pt
Received:
2
November
2010
Accepted:
3
October
2011
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.
Mathematics Subject Classification: 20M05 / 20F10
Key words: Endomorphisms / fixed points / free products
© EDP Sciences 2011
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