Danka Lučić, Enrico Pasqualetto, Tapio Rajala
In the context of Euclidean spaces equipped with an arbitrary Radon measure, we prove the equivalence among several different notions of Sobolev space present in the literature and we characterise the minimal weak upper gradient of all Lipschitz functions.
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In the setting of the Euclidean space equipped with an arbitrary Radon measure, we prove the equivalence between several notions of function of bounded variation present in the literature. We also study the relation between various definitions of 1-Sobolev function.
Endpoint-Safe Direct Characterisations of Weighted Bilinear Hardy Inequalities on Arbitrary Intervals
本文在任意实区间上刻画加权双线性 Hardy 不等式，通过有向紧限制和端点安全输入分布，给出全局常数与局部特征的等价刻画，并恢复经典 $A_1,\ldots,A_7$ 条件。
We obtain a characterisation of the Fourier transform on the space of Schwartz-Bruhat functions on locally compact Abelian groups. The result states that any appropriately additive bijection of the Schwartz space onto itself, which interchanges convolution and pointwise products is essentially the Fourier transform. The proof of this result is very similar to that obtained by the author recently for the Euclidean Fourier transform.
We provide a quick proof of the following known result: the Sobolev space associated with the Euclidean space, endowed with the Euclidean distance and an arbitrary Radon measure, is Hilbert. Our new approach relies upon the properties of the Alberti-Marchese decomposability bundle. As a consequence of our arguments, we also prove that if the Sobolev norm is closable on compactly-supported smooth functions, then the reference measure is absolutely continuous with respect to the Lebesgue measure.
Weighted Besov Spaces on Homogeneous Lie Groups and Applications to Parabolic Anderson Models
本文在齐次李群上建立加权非齐次Besov空间的统一理论，将其应用于含Rockland算子与奇异初始数据的抛物Anderson型方程，分别在时空噪声和纯空间噪声下得到相关结果，依赖温和缝合引理完成推导。
Bounded weighted composition operators, as well as compact weighted composition operators, on Fock spaces have been characterised. This characterisation is refined to the extent that the question of whether weighted composition operators on the Fock space can be supercyclic is answered in the negative.
Nuclear weighted conditional expectation operators
研究核加权条件期望算子在不同L^p(μ)空间间的性质，证明非原子测度空间下此类算子仅为零算子。
We study nuclear embeddings for weighted spaces of Besov and Triebel-Lizorkin type where the weight belongs to some Muckenhoupt class and is essentially of polynomial type. Here we can extend our previous results [17,19] where we studied the compactness of corresponding embeddings. The concept of nuclearity goes back to Grothendieck who defined it in [14]. Recently there is a refreshed interest to study such questions [5-8,49]. This led us to the investigation in the weighted setting. We obtain complete characterisations for the nuclearity of the corresponding embedding. Essential tools are a …
Weighted conditional expectation operators and nuclearity
研究了加权条件期望算子在$ L^p(μ) $空间上的核性特征，发现非原子测度空间下此类算子仅限于零算子。
Nuclear Weighted composition operators between different $L^p$-spaces
本文研究了不同$L^p$-空间间核加权复合算子的完全刻画，证明在非原子测度空间下，唯一核加权复合算子为零算子。
Compactness of commutators of rough singular integrals
本文刻画粗糙奇异积分算子 T_Ω 交换子在双权非对角情形下的紧性，并利用矩阵权 Kolmogorov-Riesz 定理得到矩阵权紧性结果。
A characterisation is given of bounded embeddings from weighted $L^2$ spaces on bounded intervals into $L^2$ spaces on the half-plane, induced by isomorphisms given by the Laplace transform onto weighted Hardy and Bergman spaces (Zen spaces). As an application necessary and sufficient conditions are given for the boundedness of truncated Hankel and Toeplitz integral operators, including the weighted case.
Unified weighted Hardy-type inequalities
本文提出一种统一方法，在幂零Lie群上获得具有最佳常数的Hardy型不等式，改进了经典Euclidean设定下的已知结果，并推导出新的Caffarelli-Kohn-Nirenberg型不等式。
We study power boundedness and related properties such as mean ergodicity for (weighted) composition operators on function spaces defined by local properties. As a main application of our general approach we characterize when (weighted) composition operators are power bounded, topologizable, and (uniformly) mean ergodic on kernels of certain linear partial differential operators including elliptic operators as well as non-degenrate parabolic operators. Moreover, under mild assumptions on the weight and the symbol we give a characterisation of those weighted composition operators on the Fréchet…
We define Wiener amalgam spaces of (quasi)analytic ultradistributions whose local components belong to a general class of translation and modulation invariant Banach spaces of ultradistributions and their global components are either weighted $L^p$ or weighted $\mathcal{C}_0$ spaces. We provide a discrete characterisation via so called uniformly concentrated partitions of unity. Finally, we study the complex interpolation method and we identify the strong duals for most of these Wiener amalgam spaces.
Extending Bilipschitz Mappings between Separated Nets
本文提出了一种新的方法，解决了二维空间中双 Lipschitz 映射扩展问题，并开发了相关工具。
On the weighted Wiener-Lévy theorem: analogue on Euclidean space, strong converse on LCA group and applications to modulation spaces
本文在加权 Fourier 代数中证明了 Wiener-Lévy 定理的强逆定理及其在欧几里得空间和局部紧阿贝尔群上的类似形式，并应用于调制空间等以揭示色散 PDE 动力学中的非线性特征。
Multilinear Strongly Singular Integral Operators with Generalized Kernels on RD-Spaces
本文在RD-空间上引入一类具有广义核的多线性强奇异积分算子，证明了其在加权Lebesgue空间和广义加权Morrey空间上的有界性及端点估计，推广并扩展了欧氏空间中的相关已知结论。
In this paper we study the chaotic behaviour of the heat semigroup generated by the Dunkl-Laplacian on weighted $ L^p$ spaces. In the case of the heat semigroup associated to the standard Laplacian we obtain a complete picture on the spaces $ L^p(\R^n, (φ_{iρ}(x))^2 dx) $ where $ φ_{iρ} $ is the Euclidean spherical function. The behaviour is very similar to the case of the Laplace-Beltrami operator on non-compact Riemannian symmetric spaces studied by Pramanik and Sarkar.
Supercyclic weighted composition operators on the space of smooth functions
本文刻画了 d 维欧氏空间开集上光滑函数空间中加权复合算子的超循环性、强超循环性、混合性与混沌性之间的等价关系，并在一维情形下证明超循环、混合与混沌三者完全等价。
In this paper, we define locally convex vector spaces of weighted vector fields and use them as model spaces for Lie groups of weighted diffeomorphisms on Riemannian manifolds. We prove an easy condition on the weights that ensures that these groups contain the compactly supported diffeomorphisms. We finally show that for the special case where the manifold is the euclidean space, these Lie groups coincide with the ones constructed in the author's earlier work ["Weighted diffeomorphism groups of Banach spaces and weighted mapping groups". In: Dissertationes Math. 484 (2012), p. 128. DOI: 10.40…
We study the weighted boundedness of the Cauchy singular integral operator $S_\Gm$ in Morrey spaces $L^{p,λ}(\Gm)$ on curves satisfying the arc-chord condition, for a class of "radial type" almost monotonic weights. The non-weighted boundedness is shown to hold on an arbitrary Carleson curve. We show that the weighted boundedness is reduced to the boundedness of weighted Hardy operators in Morrey spaces $L^{p,λ}(0,\ell), \ell>0$. We find conditions for weighted Hardy operators to be bounded in Morrey spaces. To cover the case of curves we also extend the boundedness of the Hardy-Littlewood max…
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