English

Sets with arbitrary Hausdorff and packing scales in infinite dimensional Banach spaces

Functional Analysis 2025-11-10 v2 Dynamical Systems Metric Geometry Probability

Abstract

For every couple of Hausdorff functions ψ \psi and φ\varphi verifying some mild assumptions, there exists a compact subset K K of the Baire space such that the φ \varphi-Hausdorff measure and the ψ \psi-packing measure on K K are both finite and positive. Such examples are then embedded in any infinite dimensional Banach space to answer positively a question of Fan on the existence of metric spaces with arbitrary scales.

Keywords

Cite

@article{arxiv.2502.09643,
  title  = {Sets with arbitrary Hausdorff and packing scales in infinite dimensional Banach spaces},
  author = {Mathieu Helfter},
  journal= {arXiv preprint arXiv:2502.09643},
  year   = {2025}
}

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17 pages, 0 figure