Summable Hausdorff measure conjecture for singular strata of Alexandrov spaces

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Let n∈\mathdsNn\in\mathds{N}, let kk be a nonnegative integer, let (X,p)∈Alex⁡n(−1)(X,p)\in\operatorname{Alex}^n(-1), and set

ϵi=2−i.\epsilon_i=2^{-i}.

Here Sϵik\mathcal{S}^k_{\epsilon_i} denotes the ϵi\epsilon_i-singular stratum and Hk\mathcal{H}^k is the kk-dimensional Hausdorff measure. Summable Hausdorff measure conjecture. One has

∑i=0∞ϵi+1(n−k)−1Hk((Sϵi+1k∖Sϵik)∩B1(p))<C(n).\sum_{i=0}^\infty \epsilon_{i+1}^{(n-k)-1}\mathcal{H}^{k}\Big(\big(\mathcal{S}^{k}_{\epsilon_{i+1}}\setminus\mathcal{S}^{k}_{\epsilon_i}\big)\cap B_1(p)\Big)<C(n).

This is presented as a stronger summable form of the preceding quantitative Hausdorff measure conjecture, with the source pointing to an example as motivation. Its status is not resolved in the provided source context.

References

Primary source

Nan Li and Aaron Naber, “Quantitative Estimates on the Singular Sets of Alexandrov Spaces”, arXiv:1912.03615 (2019).

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