AUTOMORPHISMS OF THE ZERO-DIVISOR GRAPH OVER 2 × 2 MATRICES Ma, Xiaobin; Wang, Dengyin; Zhou, Jinming;
The zero-divisor graph of a noncommutative ring R, denoted by , is a graph whose vertices are nonzero zero-divisors of R, and there is a directed edge from a vertex x to a distinct vertex y if and only if xy
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