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Approximating minimum size {1,2}-connected networks. (English) Zbl 1011.68178
Summary: The problem of finding the minimum size 2-connected subgraph is a classical problem in network design. It is known to be NP-hard even on cubic planar graphs and MAX SNP-hard. We study the generalization of this problem, where requirements of 1 or 2 edge or vertex disjoint paths are specified between every pair of vertices, and the aim is to find a minimum size subgraph satisfying these requirements. For both problems we give $$\frac {3}{2}$$-approximation algorithms. This improves on the straightforward 2-approximation algorithms for these problems, and generalizes earlier results for 2-connectivity. We also give analyses of the classical local optimization heuristics for these two network design problems.
##### MSC:
 68W25 Approximation algorithms 05C40 Connectivity
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##### References:
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