Drawing (Complete) Binary TanglegramsBuchin, Kevin and Buchin, Maike and Byrka, Jaroslaw and Nöllenburg, Martin and Okamoto, Yoshio and Silveira, Rodrigo I. and Wolff, Alexander (2009) Drawing (Complete) Binary Tanglegrams. In: Graph Drawing 16th International Symposium, GD 2008, September 21- 24, 2008, Heraklion, Crete, Greece , pp. 324-335 (Official URL: http://dx.doi.org/10.1007/978-3-642-00219-9_32). Full text not available from this repository. AbstractA binary tanglegram is a pair S, T of binary trees whose leaf sets are in one-to-one correspondence; matching leaves are connected by inter-tree edges. For applications, for example in phylogenetics, it is essential that both trees are drawn without edge crossings and that the inter-tree edges have as few crossings as possible. It is known that finding a drawing with the minimum number of crossings is NP-hard and that the problem is fixed-parameter tractable with respect to that number. We prove that under the Unique Games Conjecture there is no constant-factor approximation for general binary trees. We show thatthe problem is hard even if both trees are complete binary trees. For this case we give an O(n3 )-time 2-approximation and a new and simple fixed-parameter algorithm. We show that the maximization version of the dual problem for general binary trees can be reduced to a version of MaxCut for which the algorithm of Goemans and Williamson yields a 0.878-approximation.
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