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In this paper, we introduce the zero-divisor associate graph ΓD(R) over a finite commutative ring R. It is a simple undirected graph whose vertex set consists of all non-zero elements of R, and two vertices a, b are adjacent if and only if there exist non-zero zero-divisors z1, z2 in R such that az1 = bz2. We determine the necessary and sufficient conditions for connectedness and completeness of ΓD(R) for a unitary commutative ring R. The chromatic number of ΓD(R) is also studied. Next, we characterize the rings R for which ΓD(R) becomes a line graph of some graph. Finally, we give the complete list of graphs with at most 15 vertices which are realizable as ΓD(R), characterizing the associated ring R in each case. [ABSTRACT FROM AUTHOR]

Let R be a commutative ring and S a multiplicatively closed subset of R. Hamed and Malek [7] defined an ideal P of R disjoint with S to be an S-prime ideal of R if there exists an s ∈ S such that for all a, b ∈ R if ab ∈ P, then sa ∈ P or sb ∈ P. In this paper, we introduce the notions of S-k-prime and S-k-semiprime ideals of semirings, S-k-m-system, and S-k-p-system. We study some properties and characterizations for S-k-prime and S-k-semiprime ideals of semirings in terms of S-k-m-system and S-k-p-system respectively. We also introduce the concepts of S-prime semiring and S-semiprime semiring and study the characterizations for S-k-prime and S-k-semiprime ideals in these two semirings. [ABSTRACT FROM AUTHOR]

Let R be a prime ring with its Utumi ring of quotients U, C = Z(U) extended centroid of R, F a nonzero generalized derivation of R, L a noncentral Lie ideal of R and k ≥ 2 a fixed integer. Suppose that there exists 0 ≠ a ∊ R such that a|F(un1), un2, . . . , unk ] = 0 for all u ∊ L, where n1, n2, . . . , nk ≥ 1 are fixed integers. Then either there exists λ ≥ ∊ C such that F(x) = ≥x for all x ∊ R, or R satisfies s4, the standard identity in four variables. [ABSTRACT FROM AUTHOR]

This paper is a sequel of our previous paper [1]. In this paper, we introduce the notions of regular ideal and partial ideal (p-ideal) in a ternary semiring and using these two notions we characterize regular ternary semiring. [ABSTRACT FROM AUTHOR]