Abstract

Tree rearrangement operations are widely used to measure the dissimilarity between phylogenetic trees with identical leaf sets. The tree bisection and reconnection ( tbr) distance for unrooted trees can be equivalently defined in terms of agreement forests. For both the tbr distance and the less general subtree prune and regraft ( spr) distance, we use such forests to derive new upper and lower bounds on the maximal possible distance between two trees with n leaves.

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