Nevanlinna's generalized volume-capacity conjecture

Let hh be a continuous, increasing, concave function defined and positive in some right neighborhood of 00. For a set ERE\subset\mathbb{R}, define its hh-volume by

mh(E):=limε0+inf{(xj,rj)jN}I(E,ε)jh(rj),m_h(E):=\lim_{\varepsilon\to 0+}\inf_{\{(x_j,r_j)_{j\in\mathbb{N}}\}\in\mathcal{I}(E,\varepsilon)}\sum_j h(r_j),

where

I(E,ε):={(xj,rj)jNjUrj(xj)E,jrj<ε}.\mathcal{I}(E,\varepsilon):=\left\{(x_j,r_j)_{j\in\mathbb{N}}\mid\bigcup_j U_{r_j}(x_j)\supset E,\quad \forall j\quad r_j<\varepsilon\right\}.

Assume that

0h(t)tdt\int_0^{\bullet}\frac{h(t)}{t}\,dt

diverges and that EE is a closed set with finite hh-volume. Nevanlinna's conjecture. Then Cap(E)=0\operatorname{Cap}(E)=0. This conjecture generalizes the Erdős–Gillis theorem for the logarithmic measuring function h(t)=1/logth(t)=1/|\log t|, which gives zero capacity when the corresponding hh-volume is finite. The source mentions that the conjecture goes back to Nevanlinna; its resolution is not specified here.

Sources & referencesView supporting material

Primary source

Victor Kleptsyn and Fernando Quintino, “Phase transition of capacity for the uniform G_δ-sets”, arXiv:1910.07653 (2020).

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