English

Variaiton and $\lambda$-jump inequalities on $H^p$ spaces

Classical Analysis and ODEs 2022-09-07 v4

Abstract

Let ϕS\phi\in \mathscr{S} with ϕ(x)dx=1\int\phi (x)\, dx=1, and define ϕt(x)=1tnϕ(xt),\phi_t(x)=\frac{1}{t^n}\phi (\frac{x}{t}), and denote the function family {ϕtf(x)}t>0\{\phi_t\ast f(x)\}_{t>0} by Φf(x)\Phi\ast f(x). Suppose that there exists a constant C1C_1 such that t>0ϕ^t(x)2<C1\sum_{t>0} |\hat{\phi}_t(x)|^2<C_1 for all xRnx\in \mathbb{R}^n. Then (i) There exists a constant C2>0C_2>0 such that V2(Φf)LpC2fHp,    nn+1<p1\|\mathscr{V}_2(\Phi\ast f)\|_{L^p}\leq C_2\|f\|_{H^p},\;\;\frac{n}{n+1}<p\leq 1 for all fHp(Rn)f\in H^p(\mathbb{R}^n), nn+1<p1\frac{n}{n+1}<p\leq 1. (ii) The λ\lambda-jump operator Nλ(Φf)N_{\lambda}(\Phi\ast f) satisfies λ[Nλ(Φf)]1/2LpC3fHp,    nn+1<p1,\|\lambda [N_{\lambda}(\Phi\ast f)]^{1/2}\|_{L^p}\leq C_3\|f\|_{H^p},\;\;\frac{n}{n+1}<p\leq 1, uniformly in λ>0\lambda >0 for some constant C3>0C_3>0.

Cite

@article{arxiv.2203.13905,
  title  = {Variaiton and $\lambda$-jump inequalities on $H^p$ spaces},
  author = {Sakin Demir},
  journal= {arXiv preprint arXiv:2203.13905},
  year   = {2022}
}
R2 v1 2026-06-24T10:26:30.027Z