We prove that every n-connected graph G of sufficiently large order contains a connected graph H on four vertices such that G À V ðH Þ is ðn À 3Þ-connected. This had been conjectured in Mader (High connectivity keeping sets in n-connected graphs, Combinatorica, to appear). Furthermore, we prove uppe
✦ LIBER ✦
Proof of Mader's conjecture on k-critical n-connected graphs
✍ Scribed by Su Jianji
- Publisher
- John Wiley and Sons
- Year
- 2004
- Tongue
- English
- Weight
- 201 KB
- Volume
- 45
- Category
- Article
- ISSN
- 0364-9024
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✦ Synopsis
Abstract
Mader conjectured that every k‐critical n‐connected noncomplete graph G has 2k + 2 pairwise disjoint fragments. The author in 9 proved that the conjecture holds if the order of G is greater than (k + 2)n. Now we settle this conjecture completely. © 2004 Wiley Periodicals, Inc. J Graph Theory 45: 281–297, 2004
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We show that every graph G of size at least 256 p 2 |G| contains a topological complete subgraph of order p. This slight improvement of a recent result of Komlós and Szemerédi proves a conjecture made by Mader and by Erdös and Hajnal.