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Metaplectic operators with quasi-diagonal kernels 具有拟对角核的广义算子
IF 0.8 3区 数学 Q2 MATHEMATICS Pub Date : 2025-10-28 DOI: 10.1002/mana.70053
Gianluca Giacchi, Luigi Rodino

Metaplectic operators form a relevant class of operators appearing in different applications, in this work we study their Schwartz kernels. Namely, diagonality of a kernel is defined by imposing rapid off-diagonal decay conditions, and quasi-diagonality by imposing the same conditions on the smoothing of the kernel through convolution with the Gaussian. Kernels of metaplectic operators are not diagonal. Nevertheless, as we shall prove, they are quasi-diagonal under suitable conditions. Motivation for our study comes from problems in time–frequency analysis, that we discuss in the last section.

元算子是一类相关的算子,出现在不同的应用中,本文研究了它们的Schwartz核。也就是说,核的对角性是通过施加快速的非对角衰减条件来定义的,而拟对角性是通过与高斯卷积对核的平滑施加相同的条件来定义的。广义算子的核不是对角的。然而,正如我们将证明的那样,它们在适当的条件下是拟对角的。我们研究的动力来自于时频分析中的问题,我们在最后一节讨论了这个问题。
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引用次数: 0
Hardy and BMO spaces associated with new Muckenhoupt-type weights in the Bessel setting Hardy和BMO空间与贝塞尔环境下新的muckenhoupt型权值相关
IF 0.8 3区 数学 Q2 MATHEMATICS Pub Date : 2025-10-27 DOI: 10.1002/mana.70054
Qingdong Guo, Ji Li, Dongyong Yang

We introduce the Hardy spaces Hw1(R+)$H^{1}_{w}(mathbb {R}_{+})$ with w$w$ in the new weights Ap,λ$widetilde{A}_{p,lambda }$, 1p<$1le p<infty$, associated with the Bessel operator

我们在新的权值中引入了Hardy空间H w 1 (R +) $H^{1}_{w}(mathbb {R}_{+})$和w $w$A ~ p, λ $widetilde{A}_{p,lambda }$, 1≤p &lt;∞$1le p<infty$,与贝塞尔算子相关
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引用次数: 0
Nontriviality of rings of integral-valued polynomials 整值多项式环的非平凡性
IF 0.8 3区 数学 Q2 MATHEMATICS Pub Date : 2025-10-27 DOI: 10.1002/mana.70057
Giulio Peruginelli, Nicholas J. Werner
<p>Let <span></span><math> <semantics> <mi>S</mi> <annotation>$S$</annotation> </semantics></math> be a subset of <span></span><math> <semantics> <mover> <mi>Z</mi> <mo>¯</mo> </mover> <annotation>$overline{mathbb {Z}}$</annotation> </semantics></math>, the ring of all algebraic integers. A polynomial <span></span><math> <semantics> <mrow> <mi>f</mi> <mo>∈</mo> <mi>Q</mi> <mo>[</mo> <mi>X</mi> <mo>]</mo> </mrow> <annotation>$f in mathbb {Q}[X]$</annotation> </semantics></math> is said to be integral-valued on <span></span><math> <semantics> <mi>S</mi> <annotation>$S$</annotation> </semantics></math> if <span></span><math> <semantics> <mrow> <mi>f</mi> <mrow> <mo>(</mo> <mi>s</mi> <mo>)</mo> </mrow> <mo>∈</mo> <mover> <mi>Z</mi> <mo>¯</mo> </mover> </mrow> <annotation>$f(s) in overline{mathbb {Z}}$</annotation> </semantics></math> for all <span></span><math> <semantics> <mrow> <mi>s</mi> <mo>∈</mo> <mi>S</mi> </mrow> <annotation>$s in S$</annotation> </semantics></math>. The set <span></span><math> <semantics> <mrow> <msub> <mi>Int</mi> <mi>Q</mi> </msub> <mrow> <mo>(</mo> <mi>S</mi> <mo>,</mo> <mover> <mi>Z</mi> <mo>¯</mo> </mover> <mo>)</mo> </mrow> </mrow> <annotation>${mathrm{Int}}_{mathbb{Q}}(S,bar{mathbb{Z}})$</annotation> </semantics></math> of all integral-valued polynomials on <span></span><math> <semantics> <mi>S</mi> <annotation>$S$</annotation> </semantics></math> forms a subring of <span></span><math> <semantics> <mrow> <mi>Q</mi> <mo>[</mo> <
设S $S$是Z¯$overline{mathbb {Z}}$的一个子集,Z¯是所有代数整数的环。假设多项式f∈Q [X] $f in mathbb {Q}[X]$在S $S$上是整值的,如果f (S))∈Z¯$f(s) in overline{mathbb {Z}}$对于所有s∈s $s in S$。集合Int Q (S,S $S$上所有整值多项式的Z¯)${mathrm{Int}}_{mathbb{Q}}(S,bar{mathbb{Z}})$形成Q [X]的子项$mathbb {Q}[X]$包含Z [X] $mathbb {Z}[X]$。我们说Int Q (S)Z¯)${mathrm{Int}} _{mathbb {Q}}(S,overline{mathbb {Z}})$是微不足道的,如果Int Q (S,Z¯)= Z [X] ${mathrm{Int}} _{mathbb {Q}}(S,overline{mathbb {Z}}) = mathbb {Z}[X]$,否则为非平凡。对于Int Q (S),我们给出了S $S$上的一组充分必要条件,Z¯)${mathrm{Int}} _{mathbb {Q}}(S,overline{mathbb {Z}})$是非平凡的。我们的刻画涉及到S $S$上的各种拓扑条件,这些条件是关于p $p$ -adic赋值到Q¯$overline{mathbb {Q}}$的固定扩展的;S $S$中包含的伪单调序列;分枝指数和残场度;S $S$在Z¯$overline{mathbb {Z}}$中的多项式闭包。
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引用次数: 0
The boundary Harnack principle and the 3G principle in fractal-type spaces 分形空间中的边界harack原理和3G原理
IF 0.8 3区 数学 Q2 MATHEMATICS Pub Date : 2025-10-25 DOI: 10.1002/mana.70059
Anthony Graves-McCleary, Laurent Saloff-Coste

We prove a generalized version of the 3G$3G$ Principle for Green's functions on bounded inner uniform domains in a wide class of Dirichlet spaces. In particular, our results apply to higher-dimensional fractals such as Sierpinski carpets in Rn$mathbf {R}^n$, n3$nge 3$, as well as generalized fractal-type spaces that do not have a well-defined Hausdorff dimension or walk dimension. This yields new instances of the 3G$3G$ principle for these spaces. We also discuss applications to Schrödinger operators.

我们证明了一类广义Dirichlet空间中有界内一致域上Green函数的3G原理的一个推广版本。特别地,我们的结果适用于高维分形,例如R n$ mathbf {R}^n$, n≥3$ nge 3$中的Sierpinski地毯,以及没有定义良好的Hausdorff维数或walk维数的广义分形空间。这就产生了这些空间的3G$ 3G$原则的新实例。我们还讨论了Schrödinger操作符的应用。
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引用次数: 0
Multiple exponential sums and their applications to quadratic congruences 多重指数和及其在二次同余中的应用
IF 0.8 3区 数学 Q2 MATHEMATICS Pub Date : 2025-10-25 DOI: 10.1002/mana.70063
Nilanjan Bag, Stephan Baier, Anup Haldar

In this paper, we develop a method of evaluating general exponential sums with rational amplitude functions for multiple variables, which complements work by T. Cochrane and Z. Zheng on the single variable case. As an application, for n3$nge 3$, a fixed natural number, we obtain an asymptotic formula for the (weighted) number of solutions of general quadratic congruences modulo pm$p^m$ in small boxes, thus establishing an equidistribution result for these solutions.

在本文中,我们开发了一种评估多变量具有有理振幅函数的一般指数和的方法,它补充了T. Cochrane和Z. Zheng在单变量情况下的工作。作为应用,对于n≥3$ nge 3$,一个固定自然数,我们得到了以p m$ p^m$为模的一般二次同余的(加权)解个数的渐近公式,从而建立了这些解的一个等分布结果。
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引用次数: 0
Global existence and nonexistence for an inhomogeneous quasilinear convection-diffusion equation 一类非齐次拟线性对流扩散方程的整体存在性与不存在性
IF 0.8 3区 数学 Q2 MATHEMATICS Pub Date : 2025-10-25 DOI: 10.1002/mana.70056
Wentao Huo, Zhong Bo Fang

This paper deals with the qualitative properties of solutions to the Cauchy problem for a quasilinear convection–diffusion equation with volumetric moisture content, which involves the cases of critical and fast decaying volumetric moisture content. Based on the method of directly constructing Barenblatt-type super- and sub-solutions, we establish the new criteria of global existence and nonexistence and provide the properties of expansion and shrinking of the support of the weak solution.

本文讨论了含体积含水率的准线性对流扩散方程Cauchy问题解的定性性质,其中涉及体积含水率的临界和快速衰减情况。基于直接构造barenblatt型上解和子解的方法,我们建立了整体存在性和不存在性的新判据,并给出了弱解支持的伸缩性质。
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引用次数: 0
The domination theorem for operator classes generated by Orlicz spaces 由Orlicz空间生成的算子类的支配定理
IF 0.8 3区 数学 Q2 MATHEMATICS Pub Date : 2025-10-22 DOI: 10.1002/mana.70060
D. L. Fernandez, M. Mastyło, J. Santos, E. B. Silva
<p>We study lattice summing operators between Banach spaces focusing on two classes, <span></span><math> <semantics> <msub> <mi>ℓ</mi> <mi>φ</mi> </msub> <annotation>$ell _varphi$</annotation> </semantics></math>-summing and strongly <span></span><math> <semantics> <mi>φ</mi> <annotation>$varphi$</annotation> </semantics></math>-summing operators, which are generated by Orlicz sequence lattices <span></span><math> <semantics> <msub> <mi>ℓ</mi> <mi>φ</mi> </msub> <annotation>$ell _varphi$</annotation> </semantics></math>. For the class of strongly <span></span><math> <semantics> <mi>φ</mi> <annotation>$varphi$</annotation> </semantics></math>-summing operators, we prove the domination theorem, which complements Pietsch's fundamental domination theorem for <span></span><math> <semantics> <mi>p</mi> <annotation>$p$</annotation> </semantics></math>-summing operators. Based on this result, we show that strongly <span></span><math> <semantics> <mi>φ</mi> <annotation>$varphi$</annotation> </semantics></math>-summing operators are Dunford–Pettis. As a consequence, we show that these classes are, in general, distinct. We also demonstrate that the class of strongly <span></span><math> <semantics> <mi>φ</mi> <annotation>$varphi$</annotation> </semantics></math>-summing operators between Hilbert spaces coincides with the Hilbert–Schmidt class when <span></span><math> <semantics> <msub> <mi>ℓ</mi> <mi>φ</mi> </msub> <annotation>$ell _varphi$</annotation> </semantics></math> is a separable Orlicz space. Finally, we consider generalized nuclear operators, and using a factorization description, we prove that <span></span><math> <semantics> <msub> <mi>ℓ</mi> <mi>φ</mi> </msub> <annotation>$ell _varphi$</annotation> </semantics></math>-nuclear operators are <span></span><math> <semantics> <msub> <mi>ℓ</mi> <mi>φ</mi> </msub> <annotation>$ell _varphi$</annotation> </semantics></math>-summing when <span></span><math> <semantics> <msub> <mi>ℓ</mi> <mi>
我们研究了Banach空间间的格和算子,重点研究了两类算子:φ $ell _varphi$ -和算子和强φ $varphi$ -和算子。它是由Orlicz序列格(r φ $ well _varphi$)产生的。对于强φ $varphi$ -和算子类,我们证明了支配定理,它补充了Pietsch关于p$ p$ -和算子的基本支配定理。基于这一结果,我们证明了强φ $varphi$和算子是Dunford-Pettis算子。因此,我们表明这些类通常是不同的。我们还证明了Hilbert空间之间的强φ $varphi$和算子类与Hilbert - schmidt类是一致的,当r φ $ell _varphi$是可分离的Orlicz空间时。最后,我们考虑广义核算子,并使用分解描述,证明了当r φ $ell _varphi$可分时,r φ $ell _varphi$ -核算子是r φ $ell _varphi$ -求和的。
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引用次数: 0
Ground states for a zero-mass and Coulomb–Sobolev critical Schrödinger–Poisson–Slater problem 零质量和库仑-索博列夫临界Schrödinger-Poisson-Slater问题的基态
IF 0.8 3区 数学 Q2 MATHEMATICS Pub Date : 2025-10-22 DOI: 10.1002/mana.70058
Xiaoquan Feng, Xingwen Chen, Qiongfen Zhang

In this paper, we consider the following Schrödinger–Poisson–Slater equation:

本文考虑如下Schrödinger-Poisson-Slater方程:
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引用次数: 0
The dynamics of the focusing NLH with a potential beyond the mass–energy threshold 势能超过质能阈值时聚焦NLH的动力学
IF 0.8 3区 数学 Q2 MATHEMATICS Pub Date : 2025-10-11 DOI: 10.1002/mana.70047
Shuang Ji, Jing Lu, Fanfei Meng

In this paper, we study the dynamics of the focusing nonlinear Hartree equation with a Kato potential

本文研究了具有加藤势的聚焦非线性Hartree方程的动力学问题
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引用次数: 0
On the section conjecture over fields of finite type 有限型域上的截面猜想
IF 0.8 3区 数学 Q2 MATHEMATICS Pub Date : 2025-10-08 DOI: 10.1002/mana.70049
Giulio Bresciani

Assume that the section conjecture holds over number fields. We prove then that it holds for a broad class of curves defined over finitely generated extensions of Q$mathbb {Q}$. This class contains every projective, hyperelliptic curve, every hyperbolic, affine curve of genus 2$le 2$, and a basis of open subsets of any curve. If we furthermore assume the weak Bombieri–Lang conjecture, we prove that the section conjecture holds for every hyperbolic curve over every finitely generated extension of Q$mathbb {Q}$.

假设截面猜想适用于数域。然后我们证明了它对于定义在有限生成的Q $mathbb {Q}$扩展上的一类广义曲线成立。该类包含了所有的投影曲线、超椭圆曲线、所有的双曲曲线、仿射曲线(属≤2$ le2 $)以及所有曲线的开子集的基。如果我们进一步假设弱Bombieri-Lang猜想,我们证明了在Q $mathbb {Q}$的每一个有限生成的扩展上的每一个双曲曲线上的截面猜想成立。
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引用次数: 0
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