Zheng Qing-yu
Abstract
The notion of mixed hypergraphs was introduced by Vitaly I.Voloshin in 1995,it is a generalization of the notion of hypergraphs.The lower chromatic number and the upper chromatic number of a mixed hypergraph are both importment.This paper discusses the upper chromatic number of the Cartesian product of co-hypergraphs.
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The notion of mixed hypergraphs was introduced by Vitaly I.Voloshin in 1995,it is a generalization of the notion of hypergraphs.The lower chromatic number and the upper chromatic number of a mixed hypergraph are both importment.This paper discusses the upper chromatic number of the Cartesian product of co-hypergraphs.
Key concepts: Cartesian product, Chromatic scale, Hypergraph, Upper and lower bounds, Mathematics, Generalization, Combinatorics, Product (mathematics)