Planarity of the essential graph for modules

Document Type : Research Paper

Authors

Department of Mathematics, Imam Khomeini International University, Qazvin, Iran

Abstract

‎Given a module $\mathcal{M}$ over a commutative ring $\mathcal{R}$‎, ‎we can construct a simple graph‎ ‎$EG\mathcal{(M)}$ with the vertex set $\mathcal{Z_R(M)} \setminus \mathcal{{\rm Ann}_R(M)}$‎. ‎Two distinct vertices $x‎, ‎y$ are connected whenever ${\rm Ann}_{\mathcal{M}}(xy)$ is an essential submodule‎ ‎of $\mathcal{M}$‎. ‎The present study provides a detailed analysis of planar zero-divisor and planar essential graphs‎, ‎especially when they possess a universal vertex‎. ‎It demonstrates that such graphs can be represented‎ ‎as join of some known graphs‎. ‎Additionally‎, ‎it examines that whether‎ ‎the zero-divisor and the essential graphs of $\mathbb{Z}_n$ are planar or not‎. ‎

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