Invariance of Hausdorff null-set cardinal invariants for compact Polish spaces
Invariance of Hausdorff null-set cardinal invariants for compact Polish spaces
Let be a compact Polish space, let denote the -dimensional Hausdorff measure, and let be the corresponding ideal of Hausdorff-dimension-zero subsets of . Write for the associated ideal on the standard reference space, and for an ideal let and denote its uniformity and covering cardinal invariants.
Invariance conjecture. For every compact Polish space with
for some ,
and
The claim proposes that these cardinal characteristics do not depend on the particular compact Polish space once it carries a finite, positive Hausdorff measure in some positive dimension. The supplied text establishes the analogous equalities for Euclidean spaces, but gives no resolution of this broader compact-Polish-space assertion.
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Sources & referencesView supporting material
Primary source
Tatsuya Goto, “Cardinal invariants associated with Hausdorff measures”, arXiv:2112.07952 (2021).
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