## Yahya Talebi, Atefeh Darzi

*On graph associated to co-ideals of commutative semirings*

Comment.Math.Univ.Carolin. 58,3 (2017) 293-305.**Abstract:**Let $R$ be a commutative semiring with non-zero identity. In this paper, we introduce and study the graph $\Omega(R)$ whose vertices are all elements of $R$ and two distinct vertices $x$ and $y$ are adjacent if and only if the product of the co-ideals generated by $x$ and $y$ is $R$. Also, we study the interplay between the graph-theoretic properties of this graph and some algebraic properties of semirings. Finally, we present some relationships between the zero-divisor graph $\Gamma(R)$ and $\Omega(R)$.

**Keywords:** semiring; co-ideal; maximal co-ideal

**DOI:** DOI 10.14712/1213-7243.2015.219

**AMS Subject Classification:** 16Y60 05C75

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