TR-2001-12

Non-separable detachments of graphs

Bill Jackson, Tibor Jordán

Published in:
J. Comb Theory B 87 (2003) 17-37.

Let G=(V,E) be a graph and r: V \rightarrow Z₊. An r-detachment of G is a graph H obtained by `splitting' each vertex v \in V into r(v) vertices, called the pieces of v in H. Every edge uv \in E corresponds to an edge of H connecting some piece of u to some piece of v. An r-degree specification for G is a function f on V, such that, for each vertex v \in V, f(v) is a partition of d(v) into r(v) positive integers. An f-detachment of G is an r-detachment H in which the degrees in H of the pieces of each v \in V are given by f(v). Crispin Nash-Williams obtained necessary and sufficient conditions for a graph to have a k-edge-connected r-detachment or f-detachment. We solve a problem posed by Nash-Williams by obtaining analogous results for non-separable detachments of graphs.

Bibtex entry:

@techreport{egres-01-12,

AUTHOR	=	{Jackson, Bill and Jord{\'a}n, Tibor},
TITLE	=	{Non-separable detachments of graphs},
NOTE	=	{{\tt egres.elte.hu}},
INSTITUTION	=	{Egerv{\'a}ry Research Group, Budapest},
YEAR	=	{2001},
NUMBER	=	{TR-2001-12}

}