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关于q-正则半群的若干分析-some analysis on q - regular semigroups
曲阜师范大学硕士学位论文SOME STUDIES ON Q-REGULAR SEMIGROUPS ABSTRACTWe study Q-regular semigroups in this paper which is divided into four parts. The first part is introduction and preparation knowledge. The concept of Q-regular semigroups and some related results are introduced, and we give some char- acterizations of Q-regular semigroups. In the second part, the characteristic set ofQ-regular semigroups is studied. We give a normal partition of Q, in the same time, weprove that there exists an μN on S(Q) which is the greatest strong Q-congruence such that ctrμN = πN for any normal partition N of Q. In the third part, we introduce the concept of all Q-full and Q-self-conjugate subsemigroups of Q-regular semigroups, and characterize the group congruence on Q-regular semigroups. Several equivalent expres- sions for any group congruence on Q-regular semigroups are given. In the forth part, aconstruction of Q-subdirect products of Q-regular semigroups is given, and E-unitarycovers of Q-regular semigroups are discussed, in particular for those whose maximum group homomorphic image is a given group.Key words: Q-regular semigroup; characteristic set; group congruence; Q-subdirect product; E-unitary cover.曲阜师范大学硕士学位论文目录第一章引言与预备知识 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1第二章特征集的正规划分. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7第三章Q-正则半群上的群同余 10第四章Q-正则半群的 Q-次直积 16参考文献 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22致谢 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24第一章引言与预备知识1987年, Yamada和Sen[1]引入了P-正则半群的概念. 1989年, [2]给出了P- 正则半群的等价刻画, 即正则半群 S 是 P-正则的当且仅当对任意 a ∈ S 存在 V (a) 的非空子集 VP (a) 满足:(1) 对任意 a+ ∈ VP (a)有 a ∈ VP (a+),(2) 对任意 a, b ∈ S有 VP (b)VP (a) ? VP (ab).迄今为止, 对于P-正则半群的研究已经相当广泛. 关于P-正则半群的一些结果, 可以参考Yamada[3, 4], Sen[5], Sen和Seth[6
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