| Resum: |
The notions of Lipschitz and bilipschitz mappings provide classes of mappings connected to the geometry of metric spaces in certain ways. A notion between these two is given by "regular mappings" (reviewed in Section 1), in which some non-bilipschitz behavior is allowed, but with limitations on this, and in a quantitative way. In this paper we look at a class of mappings called (s, t)-regular mappings. These mappings are the same as ordinary regular mappings when s = t, but otherwise they behave somewhat like projections. In particular, they can map sets with Hausdorff dimension s to sets of Hausdorff dimension t. We mostly consider the case of mappings between Euclidean spaces, and show in particular that if f : Rs --> Rn is an (s, t)-regular mapping, then for each ball B in Rs there is a linear mapping [lambda] : Rs --> Rs-t and a subset E of B of substantial measure such that the pair (f, [lambda]) is bilipschitz on E. We also compare these mappings in comparison with "nonlinear quotient mappings" from [6]. |
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