Hans Triebel
This is the direct continuation of the paper "Mapping properties of Fourier transforms" (arXiv:2112.04896) using the same notation as there without further explanations. It deals with continuous and compact mappings of the Fourier transform $F$ between some weighted function spaces on $\mathbb{R}^n$.
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Mapping properties of the Fourier transform in spaces with dominating mixed smoothness
该论文聚焦控制混合光滑函数空间，探究傅里叶变换的连续及紧映射特性，为相关函数空间理论提供映射性质层面的研究支撑。
The composition of the Fourier transform in $\mathbb{R}^n$ with a suitable pseudodifferential operator is called a Fourier operator. It is compact in appropriate function spaces. The paper deals with its spectral theory. This is based on mapping properties of the Fourier transform as developed in a preceding paper and related assertions for pseudodifferential operators.
The paper deals with continuous and compact mappings generated by the Fourier transform between distinguished function spaces on $\mathbb{R}^n$. The degree of compactness will be measured in terms of related entropy numbers. We are more interested in the interplay of already available ingredients than in generality.
We investigate so-called Laplace--Carleson embeddings for large exponents. In particular, we extend some results by Jacob, Partington, and Pott. We also discuss some related results for Sobolev- and Besov spaces, and mapping properties of the Fourier transform. These variants of the Hausdorff--Young theorem appear difficult to find in the literature. We conclude the paper with an example related to an open problem.
Mapping properties of Fourier transforms, revisited
本文利用小波展开、对偶性、空间插值和扩展的 Hausdorff-Young 不等式，研究了 Fourier 变换在 Besov 与 Sobolev 空间间的连续与紧映射性质，并通过熵数和逼近数度量紧致度。
We prove new Pitt inequalities for the Fourier transforms with radial and non-radial weights using weighted restriction inequalities for the Fourier transform on the sphere. We also prove new Riemann-Lebesgue estimates and versions of the uncertainty principle for the Fourier transform.
We define a scalar valued Fourier transform for functions on the Heisenberg group and establish some of its basic properties like inversion formula, Plancherel theorem and Riemann-Lebesgue lemma. We also restate certain well known theorems for the group Fourier transform in terms of the new transform which we would like to call Strichartz Fourier transform.
In this paper, we will study the continuity of the Fourier transform of measures with respect to the vague topology. We show that the Fourier transform is vaguely discontinuous on R, but becomes continuous when restricting to a class of Fourier transformable measures such that either the measures, or their Fourier transforms are equi-translation bounded. We discuss continuity of the Fourier transform in the product and norm topology. We show that vague convergence of positive definite measures implies the equi translation boundedness of the Fourier transforms, which explains the continuity of …
A Modern Functional Analytic Tour of the Fourier-Bessel Transform
本文综述傅里叶-贝塞尔变换理论，提供基于现代泛函分析的新证明和方法，并推广到其他积分变换。
We study Fourier and Laplace transforms for Fourier hyperfunctions with values in a complex locally convex Hausdorff space. Since any hyperfunction with values in a wide class of locally convex Hausdorff spaces can be extended to a Fourier hyperfunction, this gives simple notions of asymptotic Fourier and Laplace transforms for vector-valued hyperfunctions, which improves the existing models of Komatsu, Bäumer, Lumer and Neubrander and Langenbruch.
Paley type inequality for the Fourier transform on the Heisenberg group
本文对$0 < p \leq 1.$，给出了Heisenberg群上Hardy空间$H^p(H^n);$上傅里叶变换的一个Paley型不等式
We use the classical Fourier analysis to introduce analytic families of weighted differential operators on the unit sphere. These operators are polynomial functions of the usual Beltrami-Laplace operator. New inversion formulas are obtained for totally geodesic Funk transforms on the sphere and the correpsonding lambda-cosine transforms.
The quadratic phase Fourier transform QPFT is a neoteric addition to the class of Fourier transforms and embodies a variety of signal processing tools including the Fourier, fractional Fourier, linear canonical, and special affine Fourier transform. In this paper, we generalize the quadratic phase Fourier transform to quaternion valued signals, known as the quaternion QPFT QQPFT. We initiate our investigation by studying the QPFT of 2D quaternionic signals, then we introduce the QQPFT of 2D quaternionic signals. Using the fundamental relationship between the QQPFT and quaternion Fourier transf…
Weighted Gelfand pairs, weighted spherical Fourier transform and multipliers
本文通过加权Lebesgue空间中的双不变函数Banach代数引入广义Gelfand对，构造球面Fourier变换，并据此刻画相关代数的乘子。
In this paper the inverse of the quaternionic Fourier transform on locally compact abelian groups is verified.
Split functions, Fourier transforms and multipliers
研究了分裂算子S_t对函数f的傅里叶变换的L^p范数和傅里叶乘子m的算子范数的影响。我们的大多数结果假设p是一个偶数，并且当f或m有紧支集时往往更强。
Fourier transform of function on locally compact Abelian groups taking value in Banach spaces
考虑局部紧群$G$上取值于巴拿赫空间$X$且在Bochner意义下平方可积的向量值函数的傅里叶变换.如果$G$是一个有限群，那么傅里叶变换是一个有界算子。若$G$是无限群，则傅里叶变换$F: L_2(G,X)\to L_2(\widehat G,X)$是有界算子当且仅当巴拿赫空间$X$同构于Hilbert空间.
A Paley-Wiener theorem for the inverse Fourier transform on some homogeneous spaces
在非紧的黎曼对称空间和海森堡群上，给出并证明了一个关于傅里叶逆变换的Paley-Wiener定理。证明的主要成分是古兹曼公式。
On the Fourier-Laplace Transform of Functionals on a Weighted Space of Infinitely Differentiable Functions
本文用傅里叶-拉普拉斯变换描述了定义在实直线上的无穷可微函数加权空间G上的线性连续泛函的强对偶空间。
A mathematical survey on Fourier type integral transform and their offshoots: windowed Fourier transform, wavelet transform and Stockwell transform
本文综述了Fourier型积分变换（如FrFT、LCT、QPFT）及其衍生变换的卷积性质、不确定性原理和多分辨率分析，并详细给出了四元数情形下的对应不等式。
The Fractional Fourier Transform is a ubiquitous signal processing tool in basic and applied sciences. The Fractional Fourier Transform generalizes every property and application of the Fourier Transform. Despite the practical importance of the discrete fractional Fourier transform, its applications in digital communications have been elusive. The convolution property of the discrete Fourier transform plays a vital role in designing multi-carrier modulation systems. Here we report a closed-form affine discrete fractional Fourier transform and we show the circular convolution property for it. T…
The aim of this paper is to establish a few uncertainty principles for the Fourier and the short-time Fourier transforms. Also, we discuss an analogue of Donoho--Stark uncertainty principle and provide some estimates for the size of the essential support of the short-time Fourier transform.
Some Conditions for Existence and Integrability of the Fourier Transform
傅里叶变换是自然定义的可积函数。否则，应规定在何种意义上理解傅立叶变换。我们考虑一类径向函数，一般来说，不可积函数。傅里叶变换被计算为广义积分，并且极限与分布意义下的傅里叶变换一致。并证明了逆傅里叶公式。给出了所得结果的一些应用。
There is a canonical unitary transformation from $L^2(\R)$ onto the Fock space $F^2$, called the Bargmann transform. We study the action of the Bargmann transform on several classical integral operators on $L^2(\R)$, including the fractional Fourier transform, the fractional Hilbert transform, and the wavelet transform.
On the Finite Dimensionality of Spaces of Absolutely Convergent Fourier Transforms
我们推广了K. Karlander [Math.Scand.80（1997）]关于有限维空间的绝对收敛傅里叶变换。
Generalized Fourier transform on Chébli-Triméche hypergroups
本文证明了Chébli-Triméche超群上广义傅里叶变换的Hardy-Littlewood不等式，并在Jacobi超群的特殊情形下研究了Besov型空间上广义傅里叶变换的可积性.
In this article, we define the Fourier-Dunkl transform, which generalizes the Fourier transform. We prove Strichartz's restriction theorem for the Fourier-Dunkl transform for a cone-hyper-surface and its generalisation to the family of orthonormal functions. As an application of this restriction theorem, we derive the Strichartz inequality associated with the square root of Dunkl Laplacian for the family of orthonormal functions.
Fourier restriction for Schatten class operators and functions on phase space
该研究提出Schatten类算子的Fourier-Wigner傅里叶限制变体，证明其等价于相空间函数的辛傅里叶变换限制，推导了量子傅里叶延拓算子的Schatten类结果，肯定证明了Mishra与Vemuri关于测度Weyl变换的猜想。
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.
The finite Fourier transform of classical polynomials
正交多项式族$A_{n}(x)$的有限傅里叶变换是由$0$在其自然域外扩展的多项式的通常变换。给出了勒让德、雅可比、盖根鲍尔和切比雪夫族的显式表达式。
A Remark on Fourier Transform
本文从中国剩余定理的视角重新解释连续傅里叶变换，并给出泊松求和公式的新推导。
In this paper we introduce the concept of a convolution type operation of functionals on Wiener space. It contains several kinds of the concepts of convolution products on Wiener space, which have been studied by many authors. We then investigate fundamental relationships between generalized analytic Fourier--Feynman transforms and convolution type operations. Both of the generalized analytic Fourier--Feynman transform of the convolution type operation and the convolution type operation of the generalized analytic Fourier--Feynman transforms are represented as a product of the generalized anal…
Degenerate Fourier transform associated with the Sturm-Liouville operator
本文研究一类与Sturm-Liouville算子相关的退化Fourier变换，其核非平凡，包含额外特征函数，区别于通常具有完备特征函数系的经典变换。
In this paper, we extend the quadratic phase Fourier transform of a complex valued functions to that of the quaternion valued functions of two variables. We call it the quaternion quadratic phase Fourier transform (QQPFT). Based on the relation between the QQPFT and the quaternion Fourier transform (QFT) we obtain the sharp Hausdorff-Young inequality for QQPFT. We define the short time quaternion quadratic phase Fourier transform (STQQPFT) and explore some of its properties including inner product relation and inversion formula. We find its relation with that of the 2D quaternion ambiguity fun…
In this paper, we first establish an evaluation formula to calculate Wiener integrals of functionals on Wiener space. We then apply our evaluation formula to carry out very easily calculating for the analytic Fourier-Feynman transform of the functionals. Some examples are furnished to illustrate the usefulness of the evaluation formula. Finally, using the evaluation formula, we establish the series approximation for the analytic Fourier-Feynman transform.
A sampling theorem on shift-invariant spaces associated with the fractional Fourier transform domain
作为傅里叶变换的推广，分数阶傅里叶变换被引入并在理论和信号处理应用方面得到了进一步的研究。在分数傅里叶变换域上得到了平移不变空间上的一个采样定理。所得的采样定理不仅推广了经典的Whittaker-Shannon-Kotelnikov采样定理与分数傅里叶变换域，但也推广了以前的采样定理的移位不变空间。
Fast complexified quaternion Fourier transform
提出一种离散复四元数傅里叶变换，通过四个标准复数傅里叶变换实现计算，并讨论其性质。
The Fourier transforms of polyhedral cones can be used, via Brion's theorem, to compute various geometric quantities of polytopes, such as volumes, moments, and lattice-point counts. We present a novel method of computing these conic Fourier transforms by polynomial interpolation. Given the fact that computing volumes of polytopes is #P-hard (Dyer--Frieze [DF88]), we cannot hope for fast algorithms in the general case. However, with extra assumptions on the combinatorics of the cone, we demonstrate it is possible to compute its Fourier transform efficiently.
We discuss different representations of the White noise spaces $(E)_β$, $0 \leq β< 1$ by introducing generalized Wick tensors. As an application we state a generalization of the Mehler formula for the Ornstein-Uhlenbeck semigroup.
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