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Metric Trees, Hyperconvex Hulls And Extensions, Asuman G. Aksoy, B. Maurizi

Turkish Journal of Mathematics

In this paper we examine the relationship between hyperconvex hulls and metric trees. After providing a linking construction for hyperconvex spaces, we show that the four-point property is inherited by the hyperconvex hull, which leads to the theorem that every complete metric tree is hyperconvex. We also consider some extension theorems for these spaces.