Maximal regular subsemigroups of orientation-preserving or orientation-reserving transformation semigroups I(n,r)
ZHAO Ping1, HU hua-bi1, XU Bo2
1. School of Basic Medicine, Guiyang Medical College, Guiyang 550004, Guizhou, China;
2. School of Mathematics and Computer Science, Guizhou Normal University, Guiyang 550001, Guizhou, China