Alain Hertz, Odile Marcotte, David Schindl
Article de revue (2014)
Résumé
Let G be a connected graph, n the order of G, and f (resp. t) the maximum order of an induced forest (resp. tree) in G. We show that f − t is at most n − ⌠2√n − 1⌡ . In the special case where n is of the form a² + 1 for some even integer a ≥ 4, f − t is at most n − ⌠2√n − 1⌡ − 1. We also prove that these bounds are tight. In addition, letting α denote the stability number of G, we show that α − t is at most n + 1 − ⌠2√2n⌡; this bound is also tight.
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