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math.CA — Classical Analysis and ODEs

Arithmetic progressions with prescribed lp gaps

Contributed by Vjekoslav Kovač

For every n≥3n\ge3 and p∈[1,∞)∖{1,2,…,n−1}p\in[1,\infty)\setminus\{1,2,\ldots,n-1\}, we prove that every measurable subset of Rd\mathbf{R}^d of positive upper Banach density, with d≥2n−2+1d\ge2^{n-2}+1, contains an nn-term arithmetic progression with every sufficiently large prescribed ℓp\ell^p gap.

Primarily AI-generated textHuman understanding: some partsEuclidean Ramsey theorydensity theoremmultilinear estimateoscillatory integralsingular integral

math.CA — Classical Analysis and ODEs

Superexponentially decaying sequences in the Erdos similarity problem

Contributed by Vjekoslav Kovač

We prove a non-universality criterion for the Erd\H{o}s similarity conjecture that applies beyond exponential (i.e., geometric) decay. In particular, it covers decreasing positive null sequences satisfying log⁡(1/an)=o(nlog⁡log⁡n)\log(1/a_n)=o(n\log\log n) and log⁡(an/an+1)≥e−nα\log(a_n/a_{n+1})\ge e^{-n^\alpha} eventually for some 0<α<10<\alpha<1.

Primarily AI-generated textHuman understanding: some partsLebesgue measureconfigurationmeasure theory