Semigroups of regular languages over a one letter alphabet are rational

Sergey Afonin, Elena Khazova. Semigroups of regular languages over a one letter alphabet are rational. In Erzsébet Csuhaj-Varjú, Zoltán Ésik, editors, Automata and Formal Languages, 12th International Conference, AFL 2008, Balatonfüred, Hungary, May 27-30, 2008, Proceedings. pages 61-73, 2008.

Abstract

Abstract is missing.