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<∞1<p<\infty, p≠2p\ne2, and D>1D>1, every nn-point subset of any LpL_p embeds with distortion DD into ℓpd\ell_p^d (same exponent, coordinate target, nonlinear map) with d≤exp⁡(Cp,D(log⁡n)γ(p))=no(1)d\le\exp(C_{p,D}(\log n)^{\gamma(p)})=n^{o(1)}, where γ(p)=2−p\gamma(p)=2-p for p<2p<2 and 1−2/p1-2/p for p>2p>2; exact embeddings need dimension of order n2n^2. This answers the o(n)o(n) question for every p∈(1,∞)∖{2}p\in(1,\infty)\setminus\{2\}. Not shown: p=1p=1; Naor's Question 13 itself (O(log⁡n)O(\log n) dimension in some normed space), which Naor-Ren's 2026 lower bound already excludes for ℓpd\ell_p^d targets when p>2p>2; optimal exponents; an efficient algorithm.

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analysisSep 23, 2026Significance 35/100Registry: lean checked

Naor's sublinear-dimension question for finite subsets of Lp, 1 < p < infinity, p not 2

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Theorem 1.1: for fixed 1<p<∞1<p<\infty, p≠2p\ne2, and D>1D>1, every nn-point subset of any LpL_p embeds with distortion DD into ℓpd\ell_p^d (same exponent, coordinate target, nonlinear map) with d≤exp⁡(Cp,D(log⁡n)γ(p))=no(1)d\le\exp(C_{p,D}(\log n)^{\gamma(p)})=n^{o(1)}, where γ(p)=2−p\gamma(p)=2-p for p<2p<2 and 1−2/p1-2/p for p>2p>2; exact embeddings need dimension of order n2n^2. This answers the o(n)o(n) question for every p∈(1,∞)∖{2}p\in(1,\infty)\setminus\{2\}.…

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Theorem 1.1: for fixed 1<p<∞1<p<\infty, p≠2p\ne2, and D>1D>1, every nn-point subset of any LpL_p embeds with distortion DD into ℓpd\ell_p^d (same exponent, coordinate target, nonlinear map) with d≤exp⁡(Cp,D(log⁡n)γ(p))=no(1)d\le\exp(C_{p,D}(\log n)^{\gamma(p)})=n^{o(1)}, where γ(p)=2−p\gamma(p)=2-p for p<2p<2 and 1−2/p1-2/p for p>2p>2; exact embeddings need dimension of order n2n^2. This answers the o(n)o(n) question for every p∈(1,∞)∖{2}p\in(1,\infty)\setminus\{2\}. Not shown: p=1p=1; Naor's Question 13 itself (O(log⁡n)O(\log n) dimension in some normed space), which Naor-Ren's 2026 lower bound already excludes for ℓpd\ell_p^d targets when p>2p>2; optimal exponents; an efficient algorithm.

Theorem 1.1: for fixed 1<p<∞1<p<\infty, p≠2p\ne2, and D>1D>1, every nn-point subset of any LpL_p embeds with distortion DD into ℓpd\ell_p^d (same exponent, coordinate target, nonlinear map) with d≤exp⁡(Cp,D(log⁡n)γ(p))=no(1)d\le\exp(C_{p,D}(\log n)^{\gamma(p)})=n^{o(1)}, where γ(p)=2−p\gamma(p)=2-p for p<2p<2 and 1−2/p1-2/p for p>2p>2; exact embeddings need dimension of order n2n^2. This answers the o(n)o(n) question for every p∈(1,∞)∖{2}p\in(1,\infty)\setminus\{2\}. Not shown: p=1p=1; Naor's Question 13 itself (O(log⁡n)O(\log n) dimension in some normed space), which Naor-Ren's 2026 lower bound already excludes for ℓpd\ell_p^d targets when p>2p>2; optimal exponents; an efficient algorithm.

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Naor's sublinear-dimension question for finite subsets of Lp, 1 < p < infinity, p not 2 — Mathematical Frontier Network