On the vertex connectivity of weakly zero-divisor graph of commutative rings

Abstract

The weakly zero-divisor graph $WΓ(R)$ of a commutative ring $R$ is the simple undirected graph whose vertices are nonzero zero-divisors of $R$, and two distinct vertices $x$, $y$ are adjacent if and only if there $w\in {\rm ann}(x)$ and $ z\in {\rm ann}(y)$ such that $wz =0$. In this paper, we obtain the vertex connectivity of $WΓ(R)$, where $R$ is an Artinian ring or reduced ring. Indeed, for these rings, we prove that the vertex connectivity of $WΓ(R)$ is equal to its minimum degree. This paper also characterizes all the vertices of minimum degree of $WΓ(R)$.