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Discrete Mathematics
Volume 73, Issue 3, 1989, Pages 249-260
 
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doi:10.1016/0012-365X(89)90268-9    How to Cite or Link Using DOI (Opens New Window)
Copyright © 1989 Published by Elsevier Science B.V. All rights reserved.

On diameters and radii of bridged graphs

Martin Farber

AT & T Bell Laboratories, Holmdel, New Jersey 07733, U.S.A.

Received 20 November 1986; 
revised 6 July 1987. 
Available online 29 July 2002.

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Abstract

A graph G is bridged if it contains no isometric cycles of length greater than 3. For each positive integer p, let Tp be the graph obtained by triangulating an equilateral triangle of side p with equilateral triangles of side 1. It is shown that the radius and diameter of a bridged graph containing no isometric Tp satisfy the inequality 6rless-than-or-equals, slant3d+p+3. Thus, for each fixed p, the radius of a bridged graph containing no isometric Tp is within a constant of its theoretical lower bound. Also, letting p=d+1, it follows that the radius and diameterof an arbitrary bridged graph satisfy the inequality 3rless-than-or-equals, slant2d+2. The graphs Tp, pgreater-or-equal, slanted1, show that this bound on the radius is best possible. Two results of Chang and Nemhauser concerning diameters and radii of chordal graphs are also corollaries.

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