## Abstract Mader conjectured that for all $\ell$ there is an integer $\delta^+(\ell)$ such that every digraph of minimum outdegree at least $\delta^+(\ell)$ contains a subdivision of a transitive tournament of order $\ell$. In this note, we observe that if the minimum outdegree of a digraph is suf
On non-Hamiltonian circulant digraphs of outdegree three
β Scribed by Locke, Stephen C.; Witte, Dave
- Publisher
- John Wiley and Sons
- Year
- 1999
- Tongue
- English
- Weight
- 136 KB
- Volume
- 30
- Category
- Article
- ISSN
- 0364-9024
No coin nor oath required. For personal study only.
β¦ Synopsis
We construct infinitely many connected, circulant digraphs of outdegree three that have no Hamiltonian circuit. All of our examples have an even number of vertices, and our examples are of two types: either every vertex in the digraph is adjacent to two diametrically opposite vertices, or every vertex is adjacent to the vertex diametrically opposite to itself.
π SIMILAR VOLUMES
## Abstract Let |__D__| and |D|^+^~__n__~ denote the number of vertices of __D__ and the number of vertices of outdegree __n__ in the digraph __D__, respectively. It is proved that every minimally __n__βconnected, finite digraph __D__ has |D|^+^~__n__~ββ₯β__n__β+β1 and that for __n__ββ₯β2, there is a
It is proved that every finite digraph of minimum outdegree 3 contains a subdivision of the transitive tournament on 4 vertices.
This paper completes the determination of all integers of the form pqr (where p, q, and r are distinct primes) for which there exists a vertex-transitive graph on pqr vertices which is not a Cayley graph.