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The classification of the annihilating-ideal graphs of commutative rings. (English) Zbl 1286.05065

Summary: Let \(R\) be a commutative ring and \(\mathbb A(R)\) be the set of ideals with non-zero annihilators. The annihilating-ideal graph of \(R\) is defined as the graph \(\mathbb A\mathbb G(R)\) with the vertex \(\mathbb A(R)^{\ast}=\mathbb A(R)\setminus \{(0)\}\) and two distinct vertices \(I\) and \(J\) are adjacent if and only if \(IJ = (0)\). Here, we present some results on the clique number and the chromatic number of the annihilating-ideal graph of a commutative ring. It is shown that if \(R\) is an Artinian ring and \(\omega(\mathbb A\mathbb G(R)) = 2\), then \(R\) is Gorenstein. Also, we investigate commutative rings whose annihilating-ideal graphs are complete or bipartite.

MSC:

05C25 Graphs and abstract algebra (groups, rings, fields, etc.)
05C15 Coloring of graphs and hypergraphs
05C69 Vertex subsets with special properties (dominating sets, independent sets, cliques, etc.)
13E05 Commutative Noetherian rings and modules
13E10 Commutative Artinian rings and modules, finite-dimensional algebras
16P60 Chain conditions on annihilators and summands: Goldie-type conditions
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