Problems / analysis
analysis / Metric embeddings, Banach space geometry
Naor's sublinear-dimension question for finite subsets of Lp, 1 < p < infinity, p not 2
Theorem 1.1: for fixed 1<p<∞, p=2, and D>1, every n-point subset of any Lp embeds with distortion D into ℓpd (same exponent, coordinate target, nonlinear map) with d≤exp(Cp,D(logn)γ(p))=no(1), where γ(p)=2−p for p<2 and 1−2/p for p>2; exact embeddings need dimension of order n2. This answers the o(n) question for every p∈(1,∞)∖{2}. Not shown: p=1; Naor's Question 13 itself (O(logn) dimension in some normed space), which Naor-Ren's 2026 lower bound already excludes for ℓpd targets when p>2; optimal exponents; an efficient algorithm.