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Abstract
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.
ACKNOWLEDGMENTS
The authors would like to thank the referee for giving them some valuable suggestions in the presentation of this paper. This research is supported by an NSF grant of China (No. 10071068), a Youth Scientific Foundation grant of the Human Education Department (No. 02B024) and a UGC (HK) grant #2060187 (02/04).
Notes
#Communicated by P. Higgins.