For a graph G, let D(G) be the set of all strong orientations of G. The orientation number of G is (Formula Presented), where d(D) denotes the diameter of the digraph D. In this paper, we determine the orientation number for some complete tripartite graphs. © 2015, University of Nis. All rights reserved.

Rajasekaran G

Department of Mathematics

School of Advanced Sciences

Vellore Campus

R. Sampathkumar

Vellore Institute of Technology (VIT) is a private university located in&nbsp;Tamil Nadu, India. Founded in 1984, as Vellore Engineering College, the institution offers 20 undergraduate, 34 postgraduate, four integrated and four research programs. It has campuses in Vellore, Amravati, Bhopal and Chennai.

VIT is one of the top ranked private universities in India according to NIRF, THE and QS Rankings.&nbsp;Govt. of India has recognized&nbsp;VIT, Vellore as an&nbsp;Institution of Eminence. This has allowed VIT to take independent quality initiatives and move up in world ranking.

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Journal	Filomat
Publisher	University of Nis
ISSN	03545180