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The cozero-divisor graph of $R$, denoted by $\\Gamma^{\\prime}(R)$, is a graph with vertices in $W^*(R)$, which is the set of all non-zero and non-unit elements of $R$, and two distinct vertices $a$ and $b$ in $W^*(R)$ are adjacent if and only if $a\\not\\in Rb$ and $b\\not\\in Ra$. In this paper, we show that the cozero-divisor graph of a von Neumann regular ring with finite clique number is not only weakly perfect but also perfect. 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Bakhtyiari, M.J. Nikmehr, R. Nikandish","submitted_at":"2018-04-21T09:04:15Z","abstract_excerpt":"Let $R$ be a commutative ring with non-zero identity. The cozero-divisor graph of $R$, denoted by $\\Gamma^{\\prime}(R)$, is a graph with vertices in $W^*(R)$, which is the set of all non-zero and non-unit elements of $R$, and two distinct vertices $a$ and $b$ in $W^*(R)$ are adjacent if and only if $a\\not\\in Rb$ and $b\\not\\in Ra$. In this paper, we show that the cozero-divisor graph of a von Neumann regular ring with finite clique number is not only weakly perfect but also perfect. 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