A Note on the Number of Edges Guaranteeing a C4 in Eulerian Bipartite Digraphs
نویسندگان
چکیده
Let G be an Eulerian bipartite digraph with vertex partition sizes m,n. We prove the following Turán-type result: If e(G) > 2mn/3 then G contains a directed cycle of length at most 4. The result is sharp. We also show that if e(G) = 2mn/3 and no directed cycle of length at most 4 exists, then G must be biregular. We apply this result in order to obtain an improved upper bound for the diameter of interchange graphs.
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ورودعنوان ژورنال:
- Electr. J. Comb.
دوره 9 شماره
صفحات -
تاریخ انتشار 2002