On the presence of disjoint subgraphs of a specified type
作者:
Carsten Thomassen,
期刊:
Journal of Graph Theory
(WILEY Available online 1988)
卷期:
Volume 12,
issue 1
页码: 101-111
ISSN:0364-9024
年代: 1988
DOI:10.1002/jgt.3190120111
出版商: Wiley Subscription Services, Inc., A Wiley Company
数据来源: WILEY
摘要:
AbstractWe say that a graph family ℱ has the Erdös‐Pósa property if there exists a functionf(k) such that any graphGcontains eitherkdisjoint subgraphs each isomorphic to a member of ℱ, or contains a setSof at mostf(k) vertices such thatG — Scontains no graph in ℱ. We derive a general sufficient condition for a family of graphs to have the Erdös‐Pósa property. In particular, for any fixed natural numbermthe collection of cycles of length divisible bymhas the Erdös‐Pósa property. As a by‐product, we obtain a polynomially bounded algorithm for finding a cycle of length divisible bym. On the other hand, we describe a general class of planar graphsHsuch that a collection of subdivisions ofHdoes not have the Erdös‐Pósa property. In
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