Copyright © 1989 Published by Elsevier Science B.V. All rights reserved.
On diameters and radii of bridged graphs
Received 20 November 1986;
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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 6r
3d+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 3r
2d+2. The graphs Tp, p
1, 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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