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arXiv 1012.2470math.RA
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半环的零因子图

The zero-divisor graphs of semirings

David Dolžan, Polona Oblak

摘要:

本文研究环和半环的零因子图。我们证明了(可能非交换)半环的所有零因子图都是连通的,且直径小于或等于3。刻画了半环的所有无圈零因子图,证明了当零因子图是循环图时,它们的围长小于或等于4。我们在至多有一个3-圈的交换半环上找到了所有可能的循环零因子图,并刻画了所有完全$k$ -部图和正则零因子图。此外,我们还刻画了所有的加法可消交换半环和所有的交换环,使得它们的零因子图恰好有一个3-圈。

英文摘要:

In this paper we study zero--divisor graphs of rings and semirings. We show that all zero--divisor graphs of (possibly noncommutative) semirings are connected and have diameter less than or equal to 3. We characterize all acyclic zero-divisor graphs of semirings and prove that in the case zero-divisor graphs are cyclic, their girths are less than or equal to 4. We find all possible cyclic zero-divisor graphs over commutative semirings having at most one 3-cycle, and characterize all complete $k$-partite and regular zero-divisor graphs. Moreover, we characterize all additively cancellative commutative semirings and all commutative rings such that their zero--divisor graph has exactly one 3-cycle.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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