The Gallai Milgram theorem states that every directed graph D is spanned by :(D) disjoint directed paths, where :(D) is the size of a largest stable set of D. When :(D)>1 and D is strongly connected, it has been conjectured by Las Vergnas that D is spanned by an arborescence with :(D)&1 leaves. The
A Proof of a Conjecture of Bondy Concerning Paths in Weighted Digraphs
✍ Scribed by B. Bollobás; A.D. Scott
- Publisher
- Elsevier Science
- Year
- 1996
- Tongue
- English
- Weight
- 365 KB
- Volume
- 66
- Category
- Article
- ISSN
- 0095-8956
No coin nor oath required. For personal study only.
✦ Synopsis
Our aim in this note is to prove a conjecture of Bondy, extending a classical theorem of Dirac to edge-weighted digraphs: if every vertex has out-weight at least 1 then the digraph contains a path of weight at least 1. We also give several related conjectures and results concerning heavy cycles in edge-weighted digraphs.
📜 SIMILAR VOLUMES
We prove that with three exceptions, every tournament of order n contains each oriented path of order n. The exceptions are the antidirected paths in the 3-cycle, in the regular tournament on 5 vertices, and in the Paley tournament on 7 vertices. ## 2000 Academic Press Tournaments are very rich st
We present a very short proof of a conjecture of Richards and Liestman concerning set-to-set broadcasting. 0 1993 by John Wiley & Sons, Inc.
It was conjectured in [Wang, to appear in The Australasian Journal of Combinatorics] that, for each integer k ≥ 2, there exists . This conjecture is also verified for k = 2, 3 in [Wang, to appear; Wang, manuscript]. In this article, we prove this conjecture to be true if n ≥ 3k, i.e., M (k) ≤ 3k. W
## Abstract An in‐tournament is an oriented graph such that the negative neighborhood of every vertex induces a tournament. Let __m__ = 4 or __m__ = 5 and let __D__ be a strongly connected in‐tournament of order ${{n}}\geq {{2}}{{m}}-{{2}}$ such that each arc belongs to a directed path of order at