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A generalized ideal-based zero-divisor graph

机译:广义基于理想的零除数图

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Let R be a commutative ring with identity, I its proper ideal and M be a unitary R-module. In this paper, we introduce and study a kind of graph structure of an R-module M with respect to proper ideal I, denoted by Gamma(I) (M-R) or simply Gamma(I) (M). It is the (undirected) graph with the vertex set M{0} and two distinct vertices x and y are adjacent if and only if [x : M][y : M] subset of I. Clearly, the zero-divisor graph of R is a subgraph of Gamma(0) (R); this is an important result on the definition. We prove that if ann(R)(M) subset of I and H is the subgraph of Gamma(I) (M) induced by the set of all non-isolated vertices, then diam (H) <= 3 and gr (Gamma(I) (M)) is an element of{3, 4, infinity}. Also, we prove that if Spec (R) and omega(Gamma(Nil(R))(M)) are finite, then chi(Gamma(Nil(R))(M)) <= vertical bar Spec (R)vertical bar + omega(Gamma(Nil(R))(M)). Moreover, for a secondary R-module M and prime ideal P, we determine the chromatic number and the clique number of Gamma(P) (M), where ann(R)(M) subset of P. Among other results, it is proved that for a semisimple R-module M with ann(R)(M) subset of I, Gamma(I) (M) is a forest if and only if Gamma(I) (M) is a union of isolated vertices or a star.
机译:设R是一个带身份的交换环,我是它的适当理想,M是一个R单元。在本文中,我们介绍并研究了R模块M相对于理想I的图结构,用Gamma(I)(M-R)或简单地称为Gamma(I)(M)表示。它是顶点集为M {0}的(无向)图,并且当且仅当I的[x:M] [y:M]子集时,两个不同的顶点x和y相邻。显然,零除数图R是Gamma(0)(R)的子图;这是定义的重要结果。我们证明,如果I和H的ann(R)(M)子集是由所有非孤立顶点集引起的Gamma(I)(M)的子图,则直径(H)<= 3和gr(Gamma (I)(M))是{3,4,infinity}的元素。另外,我们证明如果Spec(R)和omega(Gamma(Nil(R))(M))是有限的,则chi(Gamma(Nil(R))(M))<=竖线Spec(R)vertical bar +Ω(Gamma(Nil(R))(M))。此外,对于次要R模M和素理想P,我们确定Gamma(P)(M)的色数和集团数,其中P的an(R)(M)子集。在其他结果中,它是证明对于具有I的ann(R)(M)子集的半简单R模M,当且仅当Gamma(I)(M)是孤立的顶点或a的并集时,Gamma(I)(M)才是森林。星。

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