arXiv:2605.30101 · v2

List Recovery for Random Low-Rate Linear Codes

首次提交 2026-05-28 23:43

版本更新 2026-11-07 11:06

雷达观测 2026-11-10 10:11

摘要

We show that random linear codes of fixed dimension $d$ over sufficiently large prime fields have nearly optimal output list size for list recovery. Fix an error fraction $0<α<1$ and $0<\varepsilon<1$. For all sufficiently large block lengths $n$, with probability at least $1-\varepsilon$, the following holds simultaneously for every input list size $\ell\le 2^{δn/\log n}$, where $δ>0$ depends only on $α,\varepsilon$, and $d$. Given any list of $\ell$ symbols at each coordinate, at most $(1+\varepsilon)\ell/(1-α)$ codewords agree with the lists in at least $(1-α)n$ coordinates. Our proof adapts the colored-graph and determinant arguments of Matousek, Privetivy, and Skovron for reconstructing planar point sets from their projections. We also prove that the range of input list sizes is nearly optimal. There is a constant $c=c(α,\varepsilon)>0$ such that, for every linear code of dimension at least two over a sufficiently large prime field $\mathbb{F}_p$ and every $2^{cn}\le\ell\le p$, there are lists of size $\ell$ and a set of more than $(1+\varepsilon)\ell/(1-α)$ codewords, each of which agrees with those lists in every coordinate. The main results of this paper were discovered by ChatGPT 5.5 Sol using harness components from the UCLA Moonshot Harness Project, in response to a less optimal result found by the authors. See the end of the introduction for a discussion.