Quantitative Besicovitch conjecture for planar sets

Let σ>12\sigma>\frac{1}{2}. The notation H1\mathcal{H}^1 denotes one-dimensional Hausdorff measure, diam(U)\operatorname{diam}(U) the diameter of UU, and Br(x)B_r(x) the ball of radius rr centered at xx.

Quantitative Besicovitch conjecture. There exist positive constants ε\varepsilon and δ\delta such that, whenever ER2E\subset\mathbb R^2 is compact and

H1(EU)(1+ε)diam(U)\mathcal{H}^1(E\cap U)\leq (1+\varepsilon)\operatorname{diam}(U)

for every UU with diam(U)1\operatorname{diam}(U)\leq 1, and

H1(EBr(x))2σr\mathcal{H}^1(E\cap B_r(x))\geq 2\sigma r

for every xEx\in E and every r1r\leq 1, any two connected components of EE are at least δ\delta apart. Consequently, provided ε\varepsilon is possibly smaller, EE is the union of finitely many disjoint embedded closed loops.

The paper proposes this as a quantitative version of Besicovitch's conjecture. It concerns uniform separation and structural finiteness under quantitative upper and lower measure bounds; its resolution is not given in the source.

Sources & referencesView supporting material

Primary source

Camillo De Lellis, Federico Glaudo, Annalisa Massaccesi and Davide Vittone, “Besicovitch's 1/2 problem and linear programming”, arXiv:2404.17536 (2024).

Progress summary

Never refreshed

Nothing recorded yet. Refresh searches the literature and the public web for attempts on this problem, and writes the first summary here.

Solutions 0

No solutions have been posted yet.