We prove that every n-connected graph G of sufficiently large order contains a connected graph H on four vertices such that G Γ V Γ°H Γ is Γ°n Γ 3Γ-connected. This had been conjectured in Mader (High connectivity keeping sets in n-connected graphs, Combinatorica, to appear). Furthermore, we prove uppe
On k-critical, n-connected graphs
β Scribed by Stephen Maurer; Peter J. Slater
- Publisher
- Elsevier Science
- Year
- 1977
- Tongue
- English
- Weight
- 718 KB
- Volume
- 20
- Category
- Article
- ISSN
- 0012-365X
No coin nor oath required. For personal study only.
β¦ Synopsis
A graph G which iit n-connected (but not (I! I)-connected) is defined ro be k-xitical if for every S 6; V(G), where f S i d k. the connectivity of G -I S is h -/S ia We will say that G is an (n*,k*) graph if G is n-conneckxt (b:lt nat (n t Itconnected) and k-crirical (hut not (k c l)criticaf). This initurl study of k-critical graphs is concerned with the problem of determining the values of R and k for which there rxrsts an (n *, k ') graph. * $%is work ~8% supported by the U.S. Fhqy Resezwh and Dcurtopment Adminirrtration (ERDA) w&r -tract Na. A'&&-1)-7N9.
π SIMILAR VOLUMES
Su, J., On locally k-critically n-connected graphs, Discrete Mathematics 120 (1993) 183-190. Let 0 # W'g V(G). The graph G is called a W-locally k-critically n-connected graph or simply a W-locally (n, k)-graph, if for all V'G W with 1 V'I 6 k and each fragment F of G we have that K(G-V')=n-1 V' and
## Abstract Mader conjectured that every __k__βcritical __n__βconnected noncomplete graph __G__ has __2k__β+β2 pairwise disjoint fragments. The author in 9 proved that the conjecture holds if the order of __G__ is greater than (__k__β+β2)__n__. Now we settle this conjecture completely. Β© 2004 Wiley
The main aim of the present note is the proof of a variant of the MENGER-WHITNEY theorem on n-connected graphs (Theorem 1 below). While the result itself is well known (being, for example, a special case of the theorem of MENGER mentioned in Remark I), two of its aspects deserve attention. First, it