Simple Graphs and Commutative Zero-Divisor Semigroups

Details Simple Graphs and Commutative Zero-Divisor Semigroups Simple Graphs and Commutative Zero-Divisor Semigroups

2005-12-26

arxiv.org/abs/math/0512567v1

Mathematics

Rings and Algebras

12 Pages

Scientific paper

In this paper, we study commutative zero-divisor semigroups determined by graphs. We prove a uniqueness theorem for a class of graphs. We show two classes of graphs that have no corresponding semigroups. In particular, any complete graph $K_n$ together with more than three end vertices and any complete bipartite graph together with more than one end vertices have no corresponding semigroups. We also determine all possible zero-divisor semigroups whose zero-divisor graph is the com- plete graph $K_3$ together with two end vertices.

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