Let F be a connected graph. F is said to be interval-regular if I F~\_ l(u) uF(x )J =. i holds for all vertices u and x ~ Fi(u), i > 0. For u, v e F, let I (u, v) denote the set of all vertices on a shortest path connecting u, v. A subset W of V(F) is said to be convex if l(u,v) c W holds for each u
โฆ LIBER โฆ
On Kotzig's conjecture for graphs with a regular path-connectedness
โ Scribed by Keyi Xing; Baosheng H.U
- Publisher
- Elsevier Science
- Year
- 1994
- Tongue
- English
- Weight
- 397 KB
- Volume
- 135
- Category
- Article
- ISSN
- 0012-365X
No coin nor oath required. For personal study only.
โฆ Synopsis
Kotzig (see Bondy and Murty (1976)) conjectured that there exists no graph with the property that every pair of vertices is connected by a unique path of length k, k>2. Here we prove this conjecture for k> 12.
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Bannai and Ito conjectured in a 1987 paper that there are finitely many distance-regular graphs with fixed degree that is greater than two. In a series of papers they showed that their conjecture held for distance-regular graphs with degrees 3 or 4. In this paper we prove that the Bannai-Ito conject