The conjecture on uniform continuity and weakly Euclidean points

From papers

Let (X,d,m)(X,d,m) be the metric measure space under consideration, let kk be the dimension parameter, and define

Mk:={xX  ;  lim infr0m(Br(x))rk=0}.\mathcal{M}_k:=\left\{x\in X\;;\;\liminf_{r\rightarrow0}\frac{m(B_r(x))}{r^k}=0\right\}.

Assume that the function rm(Br(x))/rkr\mapsto m(B_r(x))/r^k is uniformly continuous for r0r\geq 0. Let WEk\underline{\mathcal{WE}}_{k} denote the set of weakly Euclidean points of dimension kk.

The conjecture on uniform continuity and weakly Euclidean points. Under these assumptions,

WEkMk.\underline{\mathcal{WE}}_{k}\subset \mathcal{M}_k.

This generalizes the preceding closedness argument for M1\mathcal{M}_1 and relates the local volume growth of weakly Euclidean points to the vanishing lower kk-dimensional density. The source does not provide a resolution of this conjecture.

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Sources & referencesView supporting material

Primary source

Yu Kitabeppu and Sajjad Lakzian, “Characterization of Low Dimensional RCD^*(K,N) spaces”, arXiv:1505.00420 (2016).

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