Philip J. Laufer

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The number of components m in regular (m, 5, c)-systems is given in the literature to date by the inequality m > 4c 2 (Bermond et al., “Proceedings, 18 th Hungarian Combin. Colloq.“, North-Holland, Amsterdam, 1976). The case m = 4c 2 is called extremal. It is proved that (4~ 2, 5, c)-systems do not exist. An example of a (4c, 5, c)-system with c = 2, is(More)
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