Abstract
AbstractWe prove that every r‐biregular digraph with n vertices has its directed diamter bounded by (3n ‐ r ‐ 3)/(r +1). We show that this bound is tight for directed as well as for undirected graphs. The upper bound remains valid for Eulerian digraphs with minimum outdegree r. © 1929 John Wiley & Sons, Inc.
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