Abstract
Let G be a connected graph of order p, and let S be a nonempty set of vertices of G. Then the Steiner distance d(S) of S is the minimum size of a connected subgraph of G whose vertex set contains S. If n is an integer, 2≤n≤p, the Steiner n-diameter, diamn(G), of G is the maximum Steiner distance of any n-subset of vertices of G. We give upper bounds on the Steiner n-diameter of G in terms of order, minimum degree δ, and girth g, of G. Moreover, we construct graphs to show that, if for given δ and g there exists a Moore graph of minimum degree δ and girth g, then the bounds are asymptotically sharp.
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