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Discrete Mathematics
Volume 142, Issues 1-3, 15 July 1995, Pages 281-286
 
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doi:10.1016/0012-365X(93)00228-W    
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Copyright © 1995 Published by Elsevier Science B.V.

Note

On a conjecture of Tuza about packing and covering of triangles

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Michael Krivelevich*

Department of Mathematics, Technion-Israel Institute of Technology, Haifa 32000, Israel


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.

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* Present address: Department of Mathematics, Raymond and Beverly Sachler Faculty of Exact Sciences, Tel Aviv University, Tel Aviv, Israel.


Discrete Mathematics
Volume 142, Issues 1-3, 15 July 1995, Pages 281-286
 
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