We show that the inclusion problem is decidable for rational languages of words indexed by scattered countable linear orderings. The method leans on a reduction to the decidability of the monadic second order theory of the infinite binary tree [9].
@article{ITA_2009__43_2_321_0, author = {Bruy\`ere, V\'eronique and Carton, Olivier and S\'enizergues, G\'eraud}, title = {Tree automata and automata on linear orderings}, journal = {RAIRO - Theoretical Informatics and Applications - Informatique Th\'eorique et Applications}, volume = {43}, year = {2009}, pages = {321-338}, doi = {10.1051/ita/2009009}, mrnumber = {2512262}, zbl = {1166.68022}, language = {en}, url = {http://dml.mathdoc.fr/item/ITA_2009__43_2_321_0} }
Bruyère, Véronique; Carton, Olivier; Sénizergues, Géraud. Tree automata and automata on linear orderings. RAIRO - Theoretical Informatics and Applications - Informatique Théorique et Applications, Tome 43 (2009) pp. 321-338. doi : 10.1051/ita/2009009. http://gdmltest.u-ga.fr/item/ITA_2009__43_2_321_0/
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