HYPERBOLICITY OF SEMIGROUP ALGEBRAS II
E. Iwaki, Eric Jespers, S. O. Juriaans, A. C. Souza Filho · Journal of Algebra and Its Applications · 2010
In 1996, Jespers and Wang classified finite semigroups whose integral semigroup ring has finitely many units. In a recent paper, Iwaki–Juriaans–Souza Filho continued this line of research by partially classifying the finite semigroups whose rational semigroup algebra contains a ℤ-order with hyperbolic unit group. In this paper, we complete this classification and give an easy proof that deals with all finite semigroups.