Copyright © 1995 Published by Elsevier Science B.V.
Note
On a conjecture of Tuza about packing and covering of triangles
Received 11 January 1993;
revised 13 September 1993.
Available online 22 December 1999.
Abstract
Zs. Tuza conjectured that if a simple graph G does not contain more than k pairwise edge disjoint triangles, then there exists a set of at most 2k edges which meets all triangles in G. We prove this conjecture for K3, 3-free graphs (graphs that do not contain a homeomorph of K3, 3). Two fractional versions of the conjecture are also proved.
Article Outline
* Present address: Department of Mathematics, Raymond and Beverly Sachler Faculty of Exact Sciences, Tel Aviv University, Tel Aviv, Israel.






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< 1 if
(1 −
is matchable, that is, there exists a matching
for every triangle
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