Boundary-type Sets of Strong Product of Directed Graphs
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Let D=(V,E) be a strongly connected digraph and let u ,v∈ V(D). The maximum distance md (u,v) is defined as md(u,v)=max{d(u,v), d(v,u)} where d(u,v) denote the length of a shortest directed u-v path in D. This is a metric. The boundary, contour, eccentric and peripheral sets of a strong digraph D with respect to this metric have been defined, and the above said metrically defined sets of a large strong digraph D have been investigated in terms of the factors in its prime factor decomposition with respect to Cartesian product. In this paper we investigate about the above boundary-type sets of a strong digraph D in terms of the factors in its prime factor decomposition with respect to strong product.
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