Weichao Guo, Guoping Zhao
This paper is devoted to the study of the relatively compact sets in Quasi-Banach function spaces, providing an important improvement of the known results. As an application, we take the final step in establishing a relative compactness criteria for function spaces with any weight without any assumption.
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We consider the Calderón-Lozanovskii construction $φ(X_0,X_1)$ in the context of quasi-Banach lattices and provide an extension of a result by V. I. Ovchinnikov concerning the associated interpolation methods $φ^c$ and $φ^0$. Our approach is based on the interpolation properties of $(\infty,1)$-regular operators between quasi-Banach lattices.
We show that, for quasi-greedy bases in Hilbert spaces, the associated conditionality constants grow at most as $O(\log N)^{1-ε}$, for some $ε>0$, answering a question by Temlyakov. We show the optimality of this bound with an explicit construction, based on a refinement of the method of Olevskii. This construction leads to other examples of quasi-greedy bases with large $k_N$ in Banach spaces, which are of independent interest.
Self-improving boundedness of the maximal operator on quasi-Banach lattices over spaces of homogeneous type
本文证明了齐型空间上具有Fatou性质的拟Banach格上Hardy--Littlewood极大算子的自改进性质，推广了2010年欧氏空间上的有界性准则，并将其应用于变指标Lebesgue空间。
Multilinear operators on Hardy spaces associated with ball quasi-Banach function spaces
本文证明了多重线性Calderón--Zygmund算子、极大算子及伪微分算子在球拟Banach函数空间相关的（局部）Hardy空间上有界，结果涵盖多种经典空间，显著推广了现有理论。
In this paper, we prove that the inner complex interpolation of two quasi-Banach lattices coincides with the closure of their intersection in their Calderón product. This generalizes a classical result by Shestakov in 1974 for Banach lattices.
Coorbit spaces associated to quasi-Banach function spaces and their molecular decomposition
本文将共轨空间理论推广到任意局部紧群上的拟巴拿赫函数空间，在更弱可积性条件下建立了分子对偶框架和Riesz序列的存在性，扩展并简化了已有工作。
In this note, we show that the Hausdorff operator $H_Φ$ is unbounded on a large family of Quasi-Banach spaces, unless $H_Φ$ is a zero operator.
Extrapolation in general quasi-Banach function spaces
该研究在一般拟Banach函数空间中建立多类Rubio de Francia外推定理，证明Hardy-Littlewood极大算子推广的映射性质与相关空间有界性，推广已有结果并给出算子应用。
Banach function spaces done right
本文讨论了（拟）Banach 函数空间的定义，推崇 Zaanen 和 Luxemburg 避免后续定义缺陷的原始定义，并在拟 Banach 函数空间设定下证明了著名基本性质的版本。
Local Hardy spaces associated with ball quasi-Banach function spaces and their dual spaces
本文在合理假设下直接建立与球拟 Banach 函数空间相关的局部 Hardy 空间的无限及有限原子分解，并据此刻画其对偶空间。
We extend the helicoidal method that we previously developed to the quasi-Banach context, proving in this way multiple Banach and quasi-Banach vector-valued inequalities for paraproducts $Π$ and for the bilinear Hilbert transform $BHT$. As an immediate application, we obtain mixed norm estimates for $Π\otimes Π$ in the whole range of Lebesgue exponents. One of the novelties in the quasi-Banach framework (that is, when $0<r<1$), which we expect to be useful in other contexts as well, is the "linearization" of the operator $ \left( \sum_k | T(f_k, g_k) |^r \right)^{1/r}$ by dualizing its weak-$L…
Let $X$ be a ball quasi-Banach function space on ${\mathbb R}^n$. In this article, the authors introduce the weak Hardy-type space $WH_X({\mathbb R}^n)$, associated with $X$, via the radial maximal function. Assuming that the powered Hardy--Littlewood maximal operator satisfies some Fefferman--Stein vector-valued maximal inequality on $X$ as well as it is bounded on both the weak ball quasi-Banach function space $WX$ and the associated space, the authors then establish several real-variable characterizations of $WH_X({\mathbb R}^n)$, respectively, in terms of various maximal functions, atoms a…
Let $α\in{\Bbb R}$, $0<p<\infty$ and $X$ be a ball quasi-Banach function space on ${\Bbb R}^n$. In this article, we introduce the Herz-type space $\dot{K}^{α,p}_X({\Bbb R}^n)$ associated with $X$. We identify the dual space of $\dot{K}^{α,p}_X({\Bbb R}^n)$, by which the boundedness of Hardy-Littlewood maximal operator on $\dot{K}^{α,p}_X({\Bbb R}^n)$ is proved. By using the extrapolation theorem on ball quasi-Banach function spaces, we establish the extrapolation theorem on Herz-type spaces associated with ball quasi-Banach function spaces. Applying our extrapolation theorem, the boundedness o…
Weak type estimates for Bochner--Riesz means on Hardy-type spaces associated with ball quasi-Banach function spaces
本文在球拟巴拿赫函数空间关联的哈代型空间框架下，建立了 Bochner–Riesz 平均及其极大算子的弱型有界性，并应用于加权勒贝格、Herz、洛伦兹、变指标勒贝格及 Morrey 空间。
Herz-Type Hardy Spaces Associated with Ball Quasi-Banach Function Spaces
本文定义与球拟 Banach 函数空间相关的 Herz 型 Hardy 空间，证明其原子分解并用于次线性算子有界性，且推广至三类具体空间。
We study the structure of families of well approximable elements of tensor products of Banach spaces including analogs of the classical quasianalytic classes in the sense of Bernstein and Beurling. As in the case of quasianalytic functions, we prove for members of these families variants of the Mazurkiewicz and Markushevich theorems and in some particular cases, if such elements are Banach-valued continuous maps on a compact metric space, estimate massivity of their graphs and level sets.
Weak and strong convergence of an implicit iterative process with errors for a finite family of asymptotically quasi $I-$nonexpansive mappings in Banach space
本文证明了Banach空间中有限族渐近拟$I_j-$非扩张映射和渐近拟非扩张映射带误差隐式迭代过程弱收敛和强收敛到公共不动点。
Marcinkiewicz-Zygmund inequalities in quasi-Banach function spaces
本文在最小结构假设下，证明了拟Banach函数格中Bernstein不等式蕴含Marcinkiewicz-Zygmund不等式，并提出了适用于多项式、指数型整函数、样条等函数类的通用方法。
We establish some new $L^p$-improving bounds for the $k$-simplex averaging operators $S^k$ that hold in dimensions $d \geq k$. As a consequence of these $L^p$-improving bounds we obtain nontrivial bounds $S^k\colon L^{p_1}\times\cdots\times L^{p_k}\rightarrow L^r$ with $r < 1$. In particular we show that the triangle averaging operator $S^2$ maps $ L^{\frac{d+1}{d}}\times L^{\frac{d+1}{d}} \rightarrow L^{\frac{d+1}{2d}}$ in dimensions $d\geq 2$. This improves quasi-Banach bounds obtained by Palsson and Sovine and extends bounds obtained by Greenleaf, Iosevich, Krauss, and Liu for the case of $…
We complete our boundedness theory of commutators of bilinear bi-parameter singular integrals by establishing the following result. If $T$ is a bilinear bi-parameter singular integral satisfying suitable $T1$ type assumptions, $\|b\|_{\operatorname{bmo}(\mathbb{R}^{n+m})} = 1$ and $1 < p, q \le \infty$ and $1/2 < r < \infty$ satisfy $1/p+1/q = 1/r$, then we have $$ \|[b, T]_1(f_1, f_2)\|_{L^r(\mathbb{R}^{n+m})} \lesssim \|f_1\|_{L^p(\mathbb{R}^{n+m})} \|f_2\|_{L^q(\mathbb{R}^{n+m})}. $$ Previously the range $r \le 1$ was proved only in the paraproduct free situation. The main novelty lies in t…
If a differential equation in a Banach manifold is invariant or quasi-invariant under the action of one or more Lie groups, then its stationary points cannot be isolated, so that classical linearized stability theorem does not apply to it. The first main purpose of this paper is to establish a linearized stability theorem for parabolic differential equations in Banach manifolds which are either invariant or quasi-invariant under actions of a number of Lie groups. The second purpose of this paper is to apply this theorem to analyze stability of stationary solutions of some free boundary problem…
An averaging method for periodic solutions of quasilinear equations in Banach spaces
本文提出一种取平均方法，用于证明Banach空间中拟线性微分方程周期解的存在性与唯一性，并应用于相对论摆的无穷系统。
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