Factorizations for variable exponent Muckenhoupt weights

2025/05/29 by Lappas, Stefanos, Oikari, Tuomas · 1 citation
#42B20 #42B35 #46B70 #47B38 #Classical Analysis and ODEs (math.CA) #FOS: Mathematics #Functional Analysis (math.FA)

paper · doi:10.48550/arxiv.2505.23300

Abstract

Given two variable exponent Muckenhoupt weights w∈ A_p(⋅) and w₁∈ A_p1(⋅), we prove that for all small enough θ>0, there holds that w₀∈ A_p0(⋅), where the weight is determined by w = w₀^1-θw₁^θ and exponent of the weight class by 1/p(⋅) = (1-θ)/p₀(⋅) + θ/p₁(⋅). The proof is based on a recent reverse Hölder's inequality for variable exponent Muckenhoupt weights by Cruz-Uribe and Penrod. We upgrade these factorizations to the restricted range context by using a recent transformation formula due to Nieraeth. Then, following an extrapolation of compactness scheme by Hytönen and Lappas, we provide an alternative proof of the recent extrapolation of compactness results of Lorist and Nieraeth in the context of weighted variable exponent Lebesgue spaces.

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• Extrapolation for bilinear compact operators in the variable exponent setting

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