# When the Annihilator Graph of a Commutative Ring Is Planar or Toroidal?

## TL;DR

This paper classifies commutative rings based on whether their annihilator graphs can be embedded on the plane or torus, linking algebraic properties with topological graph embeddings.

## Contribution

It provides a complete classification of rings whose annihilator graphs are planar or toroidal, connecting ring theory with topological graph theory.

## Key findings

- Identifies all rings with planar annihilator graphs.
- Identifies all rings with toroidal annihilator graphs.
- Establishes criteria for embeddability of annihilator graphs on surfaces.

## Abstract

Let $R$ be a commutative ring with identity, and let $Z(R)$ be the set of zero-divisors of $R$. The annihilator graph of $R$ is defined as the undirected graph $AG(R)$ with the vertex set $Z(R)^*=Z(R)\setminus\{0\}$, and two distinct vertices $x$ and $y$ are adjacent if and only if $ann_R(xy)\neq ann_R(x)\cup ann_R(y)$. In this paper, all rings whose annihilator graphs can be embed on the plane or torus are classified.