Research is supported by National Natural Science Foundation (No.19970128) of ChinaNatural Science Foundations of Guangdong Province China(No.011438,021073,Z02017).
Research is supported by National Natural Science Foundation of China (No. 19970128)Natural Science Foundations [(No. 011438), (No. 021073), (No. Z02017)] of Guangdong Province, China
The NNSF (19970128) of China and the NSF ((011438), (021073), (Z02017)) of Guangdong Province.
Let 5 be an orthodox semigroup and γ the least inverse congruence on 5. C(S) denotes the set of all congruences on S. In this paper we introduce the concept of admissible triples for S, where admissible triples are c...
The work was done when the first author visited Beijing Normal University and partly supported by National Natural Science Foundations(No.19970128,No.19901021);Natural Science Foundations of Beijing(No.1982005,No.1013006);a program for Returned Ove