Subsets of rectifiable curves in Hilbert space-the analyst’s TSP |
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Authors: | Raanan Schul |
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Institution: | (1) Mathematics Department, UCLA, Box 951555, Los Angeles, CA, 900951555 |
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Abstract: | We study one dimensional sets (Hausdorff dimension) lying in a Hilbert space. The aim is to classify subsets of Hilbert spaces
that are contained in a connected set of finite Hausdorff length. We do so by extending and improving results of Peter Jones
and Kate Okikiolu for sets in ℝd. Their results formed the basis of quantitative rectifiability in ℝd. We prove a quantitative version of the following statement: a connected set of finite Hausdorff length (or a subset of one),
is characterized by the fact that inside balls at most scales aroundmost points of the set, the set lies close to a straight
line segment (which depends on the ball). This is done via a quantity, similar to the one introduced in Jon90], which is
a geometric analogue of the Square function. This allows us to conclude that for a given set K, the ℓ2 norm of this quantity (which is a function of K) has size comparable to a shortest (Hausdorff length) connected set containing K. In particular, our results imply that, with a correct reformulation of the theorems, the estimates in Jon90, Oki92] are
independent of the ambient dimension. |
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Keywords: | |
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