## Abstract We consider the following three problems: (P1) Let __D__ be a strong digraph and let __X__ be a non‐empty subset of its vertices. Find a strong subdigraph __D__′ of __D__ which contains all vertices of __X__ and has as few arcs as possible. This problem is also known under the name the
✦ LIBER ✦
Locally semicomplete digraphs that are complementarym-pancyclic
✍ Scribed by Guo, Yubao; Volkmann, Lutz
- Publisher
- John Wiley and Sons
- Year
- 1996
- Tongue
- English
- Weight
- 923 KB
- Volume
- 21
- Category
- Article
- ISSN
- 0364-9024
No coin nor oath required. For personal study only.
✦ Synopsis
If A and Bare two subdigraphs of D, then we denote by &(A, 5) the distance between A and 5. Let D be a 2-connected locally semicomplete digraph on n 2 6 vertices. If S is a minimum separating set of D and d = min{do-s(N+(s) -S, N-(s) -S ) l s E S}, then rn = max(3, d + 2) I n/2 and D contains t w o vertex-disjoint dicycles of lengths t and nt for every integer t satisfying rn I t I n/2, unless D is a member of a family of locally semicomplete digraphs. This result extends those of Reid (Ann. Discrete
📜 SIMILAR VOLUMES
Steiner type problems for digraphs that
✍
Jørgen Bang-Jensen; Gregory Gutin; Anders Yeo
📂
Article
📅
2003
🏛
John Wiley and Sons
🌐
English
⚖ 138 KB