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Regularity of harmonic maps to trees
- American Journal of Mathematics
- Johns Hopkins University Press
- Volume 125, Number 4, August 2003
- pp. 737-771
- 10.1353/ajm.2003.0029
- Article
- Additional Information
We derive regularity theorems and local finiteness results in this paper. We first prove the ∈-regularity type theorem for harmonic maps to R-trees. That is when the order of a harmonic map at a point is sufficiently close to 1 then this point is a regular point. We then prove a regularity theorem near higher order points. We show that if the image of a fixed ball of a properly normalized harmonic map is sufficiently close to a subtree, then the image of a smaller ball of this map lies in that subtree. As an application we prove that the local image of a harmonic map to an R-tree lies in a finite homogeneous subtree.