Sharp forms and quantitative stability for general weighted discrete $p$-Hardy inequalities

Abstract

In this paper, we provide a sharp remainder term for the general weighted discrete $p$-Hardy inequality. By choosing appropriate weights and specifying $1<p<\infty$, we are able to recover the identity by Krej{č}i{ř}{\'ı}k-Štampach [KS22, Theorem 1], obtain the sharp form of the $p$-Hardy inequality by Fischer-Keller-Pogorzelski [FKP23, Theorem 1] and generalize the power weighted inequality by Gupta [Gup22, Theorem 2.1] with a sharp remainder. In addition, we prove a quantitative stability type result, thereby showing that the deficit of the discrete $p$-Hardy inequality controls the weighted distance to the family of non-trivial minimizers.

arXiv comment24 pages, revised version with additional details, updated references, and improvements to the exposition