Minimum order of loop networks of given degree and girth |
| |
Authors: | Y O Hamidoune A S Llado O Serra |
| |
Institution: | (1) Universite Pierre et Marie Curie, ER Combinatoire 17, 4 Place Jussieu, 75230 Paris, France;(2) Universitat Politènica de Catalunya, Ap.30002, 08080 Barcelona, Spain |
| |
Abstract: | Behzad, Chartrand and Wall proposed the conjecture that any regular digraph of degreer and girthg has ordern r(g – 1) + 1. The conjecture was proved in 3] for vertex transitive graphs. For Loop Networks the conjecture is equivalent to a theorem of Shepherdson in additive number theory. We show that, except for graphs of a particular structure, Loop Networks, and in general Abelian Cayley graphs, verify the stronger inequalityn (r + 1)(g – 1) – 1. This bound is best possible.Supported by the Spanish Research Council (CICYT) under project TIC 90-0712 and Acción Integrada Hispanofrancesa, TIC 79B. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|