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首页> 外文期刊>Journal of algebra and its applications >A conception of zero-divisor graph for categories of modules
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A conception of zero-divisor graph for categories of modules

机译:零除数图的概念用于模块类别

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We introduce and study zero-divisor graphs in categories of left modules over a ring R, i.e. R-MOD. The vertices of Gamma(R-MOD) consist of all nonzero morphisms in R-MOD which are not isomorphisms. Two vertices f and g are adjacent if f circle g = 0 or g circle f = 0. We observe that these graphs are connected and their diameter is equal or less than four. We prove that diam Gamma(R-MOD) = 3 if and only if R is a right and left perfect ring and R/J(R) is simple artinian. We also characterize all vertices with complements and that when a kernel or a co-kernel can be a complement for a morphism. Some discussions will be made on radius of these graphs, their clique and chromatic numbers.
机译:我们在环R上的左模块类别(即R-MOD)中引入和研究零除数图。 Gamma(R-MOD)的顶点由R-MOD中的所有非零态构成,它们不是同构。如果f圆g = 0或g圆f = 0,则两个顶点f和g相邻。我们观察到这些图是连通的,并且它们的直径等于或小于4。我们证明,当且仅当R是左右完美环且R / J(R)是简单的阿蒂尼安定律时,diam Gamma(R-MOD)= 3。我们还用补码来描述所有顶点的特征,并且当一个核或一个共核可以是一个态射的补码时。将对这些图的半径,集团和色数进行一些讨论。

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