Computing forgotten topological index of zero-divisor graphs of commutative rings

Authors: ARİF GÜRSOY, NECLA KIRCALI GÜRSOY, ALPER ÜLKER

Abstract: The main objective of this paper is to calculate the forgotten topological index of the zero-divisor graph of $\mathbb{Z}_n$. Let $p$, $q$ and $r$ be distinct prime numbers. We calculate the forgotten topological index of the ring $\Gamma(\mathbb{Z}_n)$ where $n=p^\alpha, pq, p^2q, p^2q^2, pqr$. Also, we study the forgotten topological index of the product of rings of integers modulo $n$. We construct a polynomial algorithm to compute the forgotten topological index of $\Gamma(\mathbb{Z}_n)$.

Keywords: Topological indices, forgotten topological index, zero-divisor graph, vertex degree, algorithm

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