Doubly regular asymmetric digraphs

Abstract

Let n, k and A be positive integers such that there exists a symmetric (v, k, A)-design D = (P, B), where P and B denote the sets of points and blocks respectively. Further let us assume that there exists a bijection T from B to P satisfying the following two conditions: (i) For every block a, T(a) 4 (Y. (ii) If T(a) E p, then T(P) $ a. Now we define a… (More)
DOI: 10.1016/0012-365X(88)90208-7

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