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20 results for “lower bound”

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cs.CCTheoreticalRecentJul 7, 2026

A Lower Bound for Read-Once Parity Branching Programs

Ben Lee Volk

This paper proves a new lower bound of $ ildeΩ(n^2)$ for read-once parity branching programs on boolean functions, improving upon the previous bound of $ ildeΩ(n^{1.5})$.

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cs.CCcs.DScs.ITTheoreticalRecentJul 16, 2026

Space-Entropy Lower Bounds for Random Sampling

Thomas L. Draper, Feras A. Saad

This paper proves space lower bounds for entropy-efficient random sampling using i.i.d. uniform bits.

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cs.CCTheoreticalRecentJul 26, 2026

New and Improved Concrete Lower Bounds for Orthogonal Vectors

Tameem Choudhury, Nutan Limaye, Karteek Sreenivasaiah, Srikanth Srinivasan

This paper unconditionally proves the Orthogonal Vectors and Monotone Orthogonal Vectors conjectures in concrete computational models, and provides stronger lower bounds for Boolean formulas and branc…

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cs.CCTheoreticalRecentJun 10, 2026

The Switching Lemma shows what the Switching Lemma cannot prove: an unconditional natural-proofs barrier

Bruno Loff, Suhail Sherif, Navid Talebanfard, Francesca Ugazio

This paper establishes an unconditional barrier for AC0-natural proofs, showing that they cannot prove lower bounds greater than $2^{n^{7/(d-5)}}$ against depth-$d$ circuits.

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cs.ITcs.AIcs.LGRecentMay 30, 2026

Information-Theoretic Lower Bounds for Bit-Constrained Stochastic Optimization via a Reduction to Compressed Gaussian Mean Estimation

Munsik Kim

The paper establishes information-theoretic lower bounds for stochastic optimization using low-bit gradients by reducing the problem to compressed Gaussian mean estimation, yielding sharp bounds on co…

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cs.DScs.CCTheoreticalRecentJun 11, 2026

Sketching Intersection Profiles: A Simple Proof and Three Applications

Flavio Chierichetti, Mirko Giacchini, Ravi Kumar, Alessandro Panconesi +2 more

This paper settles the complexity of three sketching problems in graphs and distributions.

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cs.DSmath.COTheoreticalRecentJul 8, 2026

Unconditional Lower Bounds for Degree Fault Tolerant Spanners

Greg Bodwin, Aleksey Lopez

This paper proves lower bounds for the size of multiplicative graph spanners in the $f$-degree fault tolerant model, matching previous conditional lower bounds and current upper bounds.

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cs.CCcs.LGTheoreticalRecentJun 11, 2026

The Program Is Still There: A Conservation Law for Program Discovery

Jorge Miguel Silva

This paper measures the lower bound for the shortest program generating a sequence, proving a conservation law and providing a deterministic engine to recover generating programs for certain sequences…

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stat.MLcs.AIcs.LGRecentMay 28, 2026

Improved Distribution Estimation in $\ell_\infty$

Doron Cohen, Aryeh Kontorovich, Yonatan Livshitz

This paper improves the theoretical bounds for estimating discrete probability distributions using the $\ell_\infty$ norm, resolving several open questions in the field.

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quant-phcond-mat.dis-nncs.CCTheoreticalRecentJul 15, 2026

Circuit complexity lower bounds for quantum spin glasses

Omar Al-Ghattas, David Gamarnik

This paper shows that shallow circuits cannot prepare near-optimal states for random quantum $p$-spin glasses, and proves depth lower bounds for such preparations.

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cs.CRmath.PRRecentMay 11, 2026

A Note on Banaszczyk's Inequality

Hongyuan Qu, Chengliang Tian, Guangwu Xu

The paper improves Banaszczyk's inequality, providing a significantly better tail estimate for the discrete Gaussian measure on a lattice, which has applications in analyzing dual attacks against the…

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cs.CCcs.DSTheoreticalRecentJul 22, 2026

The Polynomial-Time Low-Degree Conjecture is False

Songtao Mao

The polynomial-time low-degree conjecture, which predicts that low-degree indistinguishability, a uniform null distribution, permutation invariance, and independent resampling imply polynomial-time ha…

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cs.DScs.CCTheoreticalRecentJul 16, 2026

Semi-Streaming Matching in a Single Pass I: A New Framework for Lower Bounds via Blueprints

Sepehr Assadi, Max Jiang, Mars Xiang

The paper develops a new framework for proving lower bounds for the maximum matching problem in the semi-streaming model, improving upon the previous best known bounds.

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cs.DSTheoreticalRecentJun 26, 2026

Incremental Submodular Maximization: Better Than Greedy

Marcin Bienkowski, Joakim Blikstad, Jarosław Byrka, Martín Costa +2 more

The paper presents an adaptive scaling algorithm with a competitive ratio of 1.373 for incremental submodular maximization under increasing cardinality constraint, improving upon the previous best res…

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cs.LGmath.OCstat.MLTheoreticalRecentJul 16, 2026

What's in a Smoothness Constant? Tighter Rates for Local SGD with Bounded Second-order Heterogeneity

Kumar Kshitij Patel, Rustem Islamov, Sebastian U Stich, Aurelien Lucchi +2 more

This paper proves the conjecture that Local SGD outperforms Mini-batch SGD under bounded second-order heterogeneity for general convex objectives, improving the convergence guarantee and lower bounds.

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