Titlebook: Geometries and Groups; Proceedings of a Col Martin Aigner,Dieter Jungnickel Conference proceedings 1981 Springer-Verlag Berlin Heidelberg 1

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Die Anlage der Mehrgenerationenstudie W.M. Kantor [2,3] (see also the survey [4]). A recent result of the author [8] leads to a unification and generalization of Kantor‘s theorems (see Theorem 1). A typical application of this generalization is the following (see Section III.D)..Let . be a geometric lattice which is not the union of tw

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Geometries and Groups978-3-540-38639-1Series ISSN 0075-8434 Series E-ISSN 1617-9692

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Betriebswirtschaftliche BeiträgeA regular graph is 4-regular if any two vertices at distance one resp. two have exactly λ resp. μ common neighbours. Some parameter relations are proved, and certain extremal cases of 4-regular graphs are classified. In particular, we obtain a characterization of double covers of complete graphs related to regular twographs.

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