Some conditions for the existence of (d,k)-digraphs

  • Authors:
  • Yus Mochamad Cholily;Edy Tri Baskoro;Saladin Uttunggadewa

  • Affiliations:
  • Department of Mathematics, Institut Teknologi Bandung (ITB), Bandung, Indonesia;Department of Mathematics, Institut Teknologi Bandung (ITB), Bandung, Indonesia;Department of Mathematics, Institut Teknologi Bandung (ITB), Bandung, Indonesia

  • Venue:
  • IJCCGGT'03 Proceedings of the 2003 Indonesia-Japan joint conference on Combinatorial Geometry and Graph Theory
  • Year:
  • 2003

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Abstract

A (d,k)-digraph is a diregular digraph of degree d ≥ 4, diameter k ≥ 3 and the number of vertices d+d2+...+dk. The existence problem of (d,k)-digraphs is one of difficult problem. In this paper, we will present some new necessary conditions for the existence of such digraphs.