ISSN 1234-3099 (print version)

ISSN 2083-5892 (electronic version)

Discussiones Mathematicae Graph Theory

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Discussiones Mathematicae Graph Theory


Discussiones Mathematicae Graph Theory 23(2) (2003) 273-285
DOI: 10.7151/dmgt.1202


Wilfried Imrich

Montanuniversität Leoben
Institut für Mathematik und Angewandte Geometrie
Franz-Josef Straß e 18, A-8700 Leoben, Austria

Blaz Zmazek and Janez Zerovnik

University of Maribor
Faculty of Mechanical Engineering
Smetanova 17, 2000 Maribor, Slovenia
IMFM, Jadranska 19, Ljubljana


By Ulam's conjecture every finite graph G can be reconstructed from its deck of vertex deleted subgraphs. The conjecture is still open, but many special cases have been settled. In particular, one can reconstruct Cartesian products.

We consider the case of k-vertex deleted subgraphs of Cartesian products, and prove that one can decide whether a graph H is a k-vertex deleted subgraph of a Cartesian product G with at least k+1 prime factors on at least k+1 vertices each, and that H uniquely determines G.

This extends previous work of the authors and Sims. The paper also contains a counterexample to a conjecture of MacAvaney.

Keywords: reconstruction problem, Cartesian product, composite graphs.

2000 Mathematics Subject Classification: 05C.


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Received 26 September 2001
Revised 12 April 2002