%0 Journal Article %T On the rotation distance between binary trees %A Patrick Dehornoy %J Mathematics %D 2009 %I arXiv %X We develop combinatorial methods for computing the rotation distance between binary trees, i.e., equivalently, the flip distance between triangulations of a polygon. As an application, we prove that, for each n, there exist size n trees at distance 2n - O(sqrt(n)). %U http://arxiv.org/abs/0901.2557v1