共查询到19条相似文献,搜索用时 125 毫秒
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本文讨论G逆半群上的同余,文中给出刻划p^k,pk,p^T,pT的方法,并用来讨论半格同余,纯幂同余,群同余及幂等元分离同余。 相似文献
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一类阿基米德半群的构造及其同余格 总被引:4,自引:0,他引:4
本文引入同底的π-左、右零半群的夹群积并用来刻划带本原幂等元的阿基米德半群的构造.文中讨论了有限阶阿基米德半群的同余格,并证明了当有限阶阿基米德半群的正则R,L类的个数不超过5时,它的同余格是半模格. 相似文献
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幂等元位于中心的半群的局部化和最小幂幺半群同余 总被引:1,自引:1,他引:0
李刚 《纯粹数学与应用数学》2006,22(1):6-8
局部化是交换代数的重要工具[1],证明幂等元位于中心的半群在其幂等元半格上的局部化存在且唯一,并给出此类半群的最小幂幺半群同余.另外,给出了若干半群的重要同余的刻划. 相似文献
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主要讨论π-纯正半群的r-半素矩形群同余和同余对之间的关系,并且找到了在r-半素矩形群同余的集合到r-半素矩形群同余对的集合之间的一一对应. 相似文献
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求证具有强半格结构的完全正则半群成为P-完全正则半群的充分条件.利用半群的强半格结构以及同余的性质.完全单半群的强半格-正规群带是P-完全正则半群.矩形群的强半格正规纯正群类ONBG,左群的强半格左正规纯整群类LONBG,群的强半格Clifford半群类,矩形带的强半格正规带类NB,都具有性质P. 相似文献
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In this paper, we give a structure theorem for cryptogroups by means of bands and homomorphisms between completely simple
semigroups. 相似文献
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Mario Petrich 《Semigroup Forum》2003,66(3):381-400
We characterize orthogroups, local orthogroups and (left,right) cryptogroups within completely regular semigroups by means of absence of certain kind of subsemigroups. For each of these varieties V, we determine the complete set of minimal non-V -varieties. For each of the latter varieties, we determine the lattice of its subvarieties. We then give a generating semigroup and a basis of its identities for every variety which occurs in this way. The subvariety lattices are illustrated by three diagrams. 相似文献
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Mario Petrich 《Semigroup Forum》2008,66(3):381-400
Abstract. We characterize orthogroups, local orthogroups and (left,right) cryptogroups within completely regular semigroups by means
of absence of certain kind of subsemigroups. For each of these varieties V , we determine the complete set of minimal non-V -varieties. For each of the latter varieties, we determine the lattice of its subvarieties. We then give a generating semigroup
and a basis of its identities for every variety which occurs in this way. The subvariety lattices are illustrated by three
diagrams. 相似文献
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Mario Petrich 《Semigroup Forum》2005,71(3):366-388
On any regular semigroup S, the greatest idempotent pure congruence
τ the greatest idempotent separating congruence μ and the least
band congruence β are used to give the S-classification of regular semigroups as follows. These congruences generate a sublattice
Λ of the congruence lattice C(S) of S. We consider the triples (Λ,K,T), where K and T are the restrictions of the K- and T-relations
on C(S) to Λ. Such triples are characterized abstractly and form the objects of a category S whose morphisms are surjective K- and T-preserving homomorphisms subject to a mild condition. The class of regular semigroups
is made into a category S whose morphisms are fairly restricted homomorphisms. The main result of the paper is the existence of a representative functor
from S to S. The effect of the S-classification on Reilly semigroups and cryptogroups is discussed briefly. 相似文献
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Françoise Reynaud 《Discrete Mathematics》1975,12(1):37-53
The paper deals with tournaments (i.e., with trichotomic relations) and their homomorphisms. The study of tournaments by means of their homomorphisms is natural as tournaments are algebras of a special kind. We prove (1) theorems which relate combinatorial and algebraic notions (e.g., the score of a tournament and the monoid of its endomorphisms); (2) theorems concerned with strictly algebraic aspects of tournaments (e.g., characterizing the lattice of congruences of a tournament). Our main result is that the group of automorphisms and the lattice of congruences of a tournament are in general independent. In the last part of the paper we give some examples and applications to other fields. 相似文献
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刻画半群上的同余及其扩张是半群的代数理论中的一个非常重要的课题(参见[1-5])本文在[6]讨论了带上的同余的正规性和不变性以及在其Hall半群上的扩张的基础上,从同余扩张的角度刻划了完全正则的纯正半群的特征(定理26),给出了一个纯正半群的带上的所有同余都可以扩张到这个纯正半群的充分必要条件. 相似文献