This paper studies obstructions to preservation of return sets by episturmian morphisms. We show, by way of an explicit construction, that infinitely many obstructions exist. This generalizes and improves an earlier result about Sturmian morphisms.

翻译：本文研究了episturmian同态在保持返回集方面存在的障碍。通过显式构造，我们证明了存在无穷多个这样的障碍。这一结果推广并改进了此前关于Sturmian同态的结论。