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Connectedness of Efficient Solutions in Multiple Objective Combinatorial Optimization

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Abstract

Connectedness of efficient solutions is a powerful property in multiple objective combinatorial optimization since it allows the construction of the complete efficient set using neighborhood search techniques. However, we show that many classical multiple objective combinatorial optimization problems do not possess the connectedness property in general, including, among others, knapsack problems (and even several special cases) and linear assignment problems. We also extend known non-connectedness results for several optimization problems on graphs like shortest path, spanning tree and minimum cost flow problems. Different concepts of connectedness are discussed in a formal setting, and numerical tests are performed for two variants of the knapsack problem to analyze the likelihood with which non-connected adjacency graphs occur in randomly generated instances.

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Correspondence to Kathrin Klamroth.

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Communicated by H. Benson.

The work of the three authors was supported by the project “Connectedness and Local Search for Multi-objective Combinatorial Optimization” founded by the Deutscher Akademischer Austausch Dienst and Conselho de Reitores das Universidades Portuguesas. In addition, the research of Stefan Ruzika was partially supported by Deutsche Forschungsgemeinschaft (DFG) grant HA 1737/7 “Algorithmik großer und komplexer Netzwerke”.

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Gorski, J., Klamroth, K. & Ruzika, S. Connectedness of Efficient Solutions in Multiple Objective Combinatorial Optimization. J Optim Theory Appl 150, 475–497 (2011). https://doi.org/10.1007/s10957-011-9849-8

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