Article ID Journal Published Year Pages File Type
4652586 Electronic Notes in Discrete Mathematics 2011 6 Pages PDF
Abstract

Let G be the class of all graphs and K the clique operator. The validity of the equality K(G)=K2(G) has been an open question for several years. A graph in K(G) but not in K2(G) is exhibited here.

Related Topics
Physical Sciences and Engineering Mathematics Discrete Mathematics and Combinatorics