Department of Mathematics
Triangle-free graphs with large independent domination number
Let G be a simple graph of order n and minimum degree δ. The independent domination number i (G) is defined as the minimum cardinality of an independent dominating set of G. We prove the following conjecture due to Haviland [J. Haviland, Independent domination in triangle-free graphs, Discrete Mathematics 308 (2008), 3545-3550]: If G is a triangle-free graph of order n and minimum degree δ, then i (G) ≤ n - 2 δ for n / 4 ≤ δ ≤ n / 3, while i (G) ≤ δ for n / 3 < δ ≤ 2 n / 5. Moreover, the extremal graphs achieving these upper bounds are also characterized. © 2010 Elsevier B.V. All rights reserved.
Independent domination number, Triangle-free graphs
Source Publication Title
Shiu, Wai Chee, Xue-gang Chen, and Wai Hong Chan. "Triangle-free graphs with large independent domination number." Discrete Optimization 7.2-1 (2010): 86-92.