NDLI: Parameterized complexity of discrete morse theory

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Parameterized complexity of discrete morse theory

Content Provider	ACM Digital Library
Author	Burton, Benjamin A. Paixão, João Spreer, Jonathan Lewiner, Thomas
Abstract	Optimal Morse matchings reveal essential structures of cell complexes which lead to powerful tools to study discrete geometrical objects, in particular discrete 3-manifolds. However, such matchings are known to be NP-hard to compute on 3-manifolds, through a reduction to the erasability problem. Here, we refine the study of the complexity of problems related to discrete Morse theory in terms of parameterized complexity. On the one hand we prove that the erasability problem is W[P]-complete on the natural parameter. On the other hand we propose an algorithm for computing optimal Morse matchings on triangulations of 3-manifolds which is fixed-parameter tractable in the treewidth of the bipartite graph representing the adjacency of the 1- and 2-simplexes. This algorithm also shows fixed parameter tractability for problems such as erasability and maximum alternating cycle-free matching. We further show that these results are also true when the treewidth of the dual graph of the triangulated 3-manifold is bounded. Finally, we investigate the respective treewidths of simplicial and generalized triangulations of 3-manifolds.
Starting Page	127
Ending Page	136
Page Count	10
File Format	PDF
ISBN	9781450320313
DOI	10.1145/2462356.2462391
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	2013-06-17
Publisher Place	New York
Access Restriction	Subscribed
Subject Keyword	Alternating cycle-free matching W[p]-completeness Erasability Discrete morse theory Collapsibility Computational topology Parameterized complexity Fixed parameter tractability Treewidth
Content Type	Text
Resource Type	Article

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