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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

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✦ 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


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Steiner type problems for digraphs that
✍ Jørgen Bang-Jensen; Gregory Gutin; Anders Yeo 📂 Article 📅 2003 🏛 John Wiley and Sons 🌐 English ⚖ 138 KB

## 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