STANDARD REPRESENTATIONS OF ORTHODOX SEMIGROUPS
Yong He, Yuqi Guo, K. P. Shum · Communications in Algebra · 2005
Orthodox semigroups have been studied by many authors, in particular by Hall, Yamada and Petrich. In this paper, we give the standard representation of orthodox semigroups and investigate various e-varieties of orthodox semigroups which are determined by the standard representations.