Covering R-trees
| dc.creator | Berestovskii, V. N. | |
| dc.creator | Plaut, C. | |
| dc.date | 2007-07-24 | |
| dc.date | 2008-12-10 | |
| dc.date.accessioned | 2026-07-07T12:10:24Z | |
| dc.date.available | 2026-07-07T12:10:24Z | |
| dc.description | We show that every inner metric space X is the metric quotient of a complete R-tree via a free isometric action, which we call the covering R-tree of X. The quotient mapping is a weak submetry (hence, open) and light. In the case of compact 1-dimensional geodesic space X, the free isometric action is via a subgroup of the fundamental group of X. In particular, the Sierpin'ski gasket and carpet, and the Menger sponge all have the same covering R-tree, which is complete and has at each point valency equal to the continuum. This latter R-tree is of particular interest because it is "universal" in at least two senses: First, every R-tree of valency at most the continuum can be isometrically embedded in it. Second, every Peano continuum is the image of it via an open light mapping. We provide a sketch of our previous construction of the uniform universal cover in the special case of inner metric spaces, the properties of which are used in the proof. | |
| dc.identifier | https://arxiv.org/abs/0707.3609 | |
| dc.identifier | http://arxiv.org/abs/0707.3609 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/209927 | |
| dc.subject | Metric Geometry | |
| dc.subject | General Topology | |
| dc.subject | Geometric Topology | |
| dc.subject | 54F50 (Primary); 28A80, 20F65 (Secondary) | |
| dc.title | Covering R-trees | |
| dc.type | text |