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On k-critical, n-connected graphs

✍ Scribed by Stephen Maurer; Peter J. Slater


Publisher
Elsevier Science
Year
1977
Tongue
English
Weight
718 KB
Volume
20
Category
Article
ISSN
0012-365X

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✦ 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.


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## 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. Β© 2004 Wiley

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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