Mader conjectured that every non-complete \(k\)-critically \(n\)-connected graph has \((2 k+2)\) pairwise disjoint fragments. The conjecture was verified by Mader for \(k=1\). In this paper, we prove that this conjecture holds also for \(k=2\). 1993 Academic Press. Inc.
On k-con-Critically n-Connected Graphs
β Scribed by W. Mader
- Publisher
- Elsevier Science
- Year
- 2002
- Tongue
- English
- Weight
- 221 KB
- Volume
- 86
- Category
- Article
- ISSN
- 0095-8956
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β¦ Synopsis
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 upper bounds for the order of all n-connected graphs of criticality 3, 4, and 5.
π SIMILAR VOLUMES
## 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
## Abstract A graph __G__ is critically 2βconnected if __G__ is 2βconnected but, for any point __p__ of __G, G β p__ is not 2βconnected. Critically 2βconnected graphs on __n__ points that have the maximum number of lines are characterized and shown to be unique for __n__ β©Ύ 3, __n__ β 11.