Bohdan Zelinka, Katedra diskretni matematiky a statistiky Technicke univerzity, Voronezska 13, 461 17 Liberec 1, Czech Republic, e-mail: bohdan.zelinka@vslib.cz
Abstract: The paper describes the properties of two transformations of graphs. One of them was introduced by F. Gliviak for the sake of study of metric properties of graphs, the other is related to it.
Keywords: graph transformation, neighbourhood of a vertex, distance between vertices, connectivity of a graph
Classification (MSC 1991): 05C75
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