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arXiv 2603.03219cs.CC
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大ℓ_p范数下二进制覆盖半径问题的难度

Hardness of the Binary Covering Radius Problem in Large $\ell_p$ Norms

University of Colorado Boulder(科罗拉多大学博尔德分校)

Huck Bennett, Peter Ly

AI总结:

本文证明了在大ℓ_p范数下,二进制覆盖半径问题的NP难性,并展示了其在ℓ_∞范数下的Π_2难性。

摘要:

我们研究了在ℓ_p范数下γ-近似决策性覆盖半径问题的难度(γ-GapCRP_p)。具体来说,我们证明了一个显式函数γ(p),其中当p > p_0≈35.31时,γ(p) > 1,且当p趋于无穷时,γ(p)趋于9/8,使得对于任何常数ε > 0,(γ(p) - ε)-GapCRP_p都是NP难的。这展示了首个对于显式p < ∞的GapCRP_p的难度。Haviv和Regev(CCC,2006和CJTCS,2012)之前已经证明了对于足够大的(但非显式)有限p以及p=∞时,GapCRP_p的Π_2难近似性。事实上,我们的难度结果适用于一种称为二进制覆盖半径问题(BinGapCRP)的GapCRP变种,该问题在任何范数下都可以在近似保持的方式下归约到GapCRP和决策性线性偏差问题(LinDisc)。我们还展示了在ℓ_∞范数下,对于任何常数ε > 0,(9/8 - ε)-BinGapCRP的Π_2难性。我们的工作扩展并大量使用了Manurangsi(IPL,2021)的工作,该工作证明了在ℓ_∞范数下,(9/8 - ε)-LinDisc的Π_2难性。

英文摘要:

We study the hardness of the $γ$-approximate decisional Covering Radius Problem on lattices in the $\ell_p$ norm ($γ$-$\text{GapCRP}_p$). Specifically, we prove that there is an explicit function $γ(p)$, with $γ(p) > 1$ for $p > p_0 \approx 35.31$ and $\lim_{p \to \infty} γ(p) = 9/8$, such that for any constant $\varepsilon > 0$, $(γ(p) - \varepsilon)$-$\text{GapCRP}_p$ is $\mathsf{NP}$-hard. This shows the first hardness of $\text{GapCRP}_p$ for explicit $p < \infty$. Work of Haviv and Regev (CCC, 2006 and CJTCS, 2012) previously showed $Π_2$-hardness of approximation for $\text{GapCRP}_p$ for all sufficiently large (but non-explicit) finite $p$ and for $p = \infty$. In fact, our hardness results hold for a variant of $\text{GapCRP}$ called the Binary Covering Radius Problem ($\text{BinGapCRP}$), which trivially reduces to both $\text{GapCRP}$ and the decisional Linear Discrepancy Problem ($\text{LinDisc}$) in any norm in an approximation-preserving way. We also show $Π_2$-hardness of $(9/8 - \varepsilon)$-$\text{BinGapCRP}$ in the $\ell_{\infty}$ norm for any constant $\varepsilon > 0$. Our work extends and heavily uses the work of Manurangsi (IPL, 2021), which showed $Π_2$-hardness of $(9/8 - \varepsilon)$-$\text{LinDisc}$ in the $\ell_{\infty}$ norm.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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