Roughness of Γ-Subsemigroups and Ideals in Ordered Γ-Semigroups
Thawhat Changphas, Boonyen Thongkam · 2012
In this paper we study the roughness of Γ-subsemigroups, left ideals, right ideals and bi-ideals in ordered Γ-semigroups (po-Γ-semigroups). The results on Γ-semigroups without order (see [3]) become then special cases.