Abstract

Semigroups satisfying some type of generalized commutativity were considered in quite a number of papers. S. Lajos, A. Nagy and M. Yamada dealed with externally commutative semigroups. N. Stevanović and P. V. Protić in [Structure of weakly externally commutative semigroups, Algebra Colloq. 13:3 (2006) 441-446], introduced the notion of weakly externally commutative semigroup and gave a structural description for some subclasses of this class of semigroups. In this paper we consider a class which is a generalization of the class of externally commutative semigroups.

Keywords: (Weakly) externally commutative semigroups; congruence; semilattice decomposition.

MSC: 20N02

Pages:  73--77     

Volume  67 ,  Issue  1 ,  2015