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P_E(X,R)的Green关系

Green's Relations on P_E(X,R)
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摘要 设X为非空集合,PX为X上的部分变换半群,设E为X上的一个等价关系,R为商集X/E的横断面(即在每个等价类中取一个元素所组成的集合).对于每个x∈domf,记rx为R中的元素,满足(x,rx)∈E.定义PE(X,R)={f∈PX∶x,y∈domf,(x,y)∈E■(f(x),f(y))∈E,x∈dom f■rx ∈domf,f(rx)∈R}.则PE(X,R)作成PX的子半群.本文主要讨论PE(X,R)的Green关系. Let X be a nonempety set,Px the semigroup of all partial transformations on the set X. Let E be an equivalence relation on X and R the cross-section of the quotient set X/E. For x e dom f, denote by r, the element of R with (x,rx)∈ E. Define PE (X,R) = {f∈Px: x,y∈ dom f, (x,y) ∈E→(f(x) ,f(y) ) ∈ E, x ∈dom f→rx∈ dom f,f(rx) ∈R}. Then PE(X,R)formes a subsemigroup of Px. In this paper,Green's equivalences of PE(X,R) are discussed.
出处 《信阳师范学院学报(自然科学版)》 CAS 2009年第2期165-167,共3页 Journal of Xinyang Normal University(Natural Science Edition)
关键词 半群 部分变换 Green关系 semigroups partial transformations Green equivalences
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