Open Research Index

NKBesicovitch

Yongxi Lin

Palomar Registrypalomar/PALOMAR-2026-09-19-000001Sep 19, 2026math.CAscore 0

Lean proofs of Hausdorff dimension at least n-(n-k)/p_c^k for all (n,k)-Besicovitch sets with 1 n. Here a Besicovitch set contains a translated unit k-disk in every k-dimensional direction, and p_c is the unique root in (2,3) of p^3-2p^2-2p+2=0. Building on Bourgain's arithmetic-combinatorial approach, Nets Hawk Katz and Terence Tao's New bounds for Kakeya problems (2002; preprint 2001) established the Minkowski-dimension bound 1+(n-1)/beta_c, where beta_c=p_c/(p_c-1)=1.67513... satisfies beta_c^3-4*beta_c+2=0. This is exactly n-(n-1)/p_c, so the numerical exponent itself is not new. They…

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