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  1. Holomorphic solutions and solvability theory for a class of linear complete singular integro-differential equations with convolution by Riemann–Hilbert method

    In this article, we investigate a class of linear complete singular integro-differential equations of convolution type with Fredholm integral...

    Article 02 November 2022
  2. Riemann–Hilbert method for multi-soliton solutions of a fifth-order nonlinear Schrödinger equation

    A fifth-order nonlinear Schrödinger equation which describes the one-dimensional anisotropic Heisenberg ferromagnetic spin chain is under...

    Zhou-Zheng Kang, Tie-Cheng **a, Wen-**u Ma in Analysis and Mathematical Physics
    Article 21 December 2020
  3. On the Structure of the Spectrum and the Resolvent Set of a Toeplitz Operator in a Countably Normed Space of Smooth Functions

    Abstract

    In the countably normed space of smooth functions on the unit circle, we consider a Toeplitz operator with a smooth symbol. Questions...

    A. E. Pasenchuk in Mathematical Notes
    Article 01 December 2023
  4. Stability Analysis of a Simple Discretization Method for a Class of Strongly Singular Integral Equations

    Motivated by the discrete dipole approximation (DDA) for the scattering of electromagnetic waves by a dielectric obstacle that can be considered as a...

    Martin Costabel, Monique Dauge, Khadijeh Nedaiasl in Integral Equations and Operator Theory
    Article 12 November 2023
  5. mu-Brownian Motion, Dualities, Diffusions, Transforms, and Reproducing Kernel Hilbert Spaces

    Replacing the Lebesgue measure on an interval by a Stieltjes positive non-atomic measure, we study the corresponding counterpart of the Brownian...

    Daniel Alpay, Palle Jorgensen in Journal of Theoretical Probability
    Article 24 January 2022
  6. On the Bloch–Kato conjecture for Hilbert modular forms

    The aim of this paper is to prove inequalities towards instances of the Bloch–Kato conjecture for Hilbert modular forms of parallel weight two, when...

    Matteo Tamiozzo in Mathematische Zeitschrift
    Article Open access 30 January 2021
  7. Inhomogeneous Hilbert Boundary-Value Problem with a Finite Number of Second-Type Singularity Points

    In this paper, we describe the inhomogeneous Hilbert boundary-value problem of the theory of analytic functions with an infinite index and a boundary...

    A. Kh. Fatykhov, P. L. Shabalin in Journal of Mathematical Sciences
    Article 04 January 2021
  8. Systems of two subspaces in a Hilbert space

    We study two subspace systems in a separable infinite-dimensional Hilbert space up to (bounded) isomorphism. One of the main result of this paper is...

    Masatoshi Enomoto, Yasuo Watatani in Advances in Operator Theory
    Article 07 October 2020
  9. Stochastic proximal gradient methods for nonconvex problems in Hilbert spaces

    For finite-dimensional problems, stochastic approximation methods have long been used to solve stochastic optimization problems. Their application to...

    Caroline Geiersbach, Teresa Scarinci in Computational Optimization and Applications
    Article Open access 12 January 2021
  10. Nearly Invariant Subspaces for Operators in Hilbert Spaces

    Yuxia Liang, Jonathan R. Partington in Complex Analysis and Operator Theory
    Article 02 November 2020
  11. On the Hilbert 2-Class Field Tower of Some Imaginary Biquadratic Number Fields

    Mohamed Mahmoud Chems-Eddin, Abdelmalek Azizi, ... Idriss Jerrari in Czechoslovak Mathematical Journal
    Article 27 October 2020
  12. Two new self-adaptive algorithms for solving the split common null point problem with multiple output sets in Hilbert spaces

    To solve the split common null point problem with multiple output sets in Hilbert spaces, we introduce two new self-adaptive algorithms and prove...

    Simeon Reich, Truong Minh Tuyen in Journal of Fixed Point Theory and Applications
    Article 27 February 2021
  13. Weighted Composition Operators That Preserve Frames On Weighted Hardy Spaces

    In this paper, we characterize weighted composition operators that preserve frames on the weighted Hardy spaces in the unit disk. In particular, we...

    Ya Li Dong, Rui Liu, Guo **ang Lu in Acta Mathematica Sinica, English Series
    Article 02 February 2024
  14. On a Riemann–Hilbert problem for \(\Psi \)-hyperholomorphic functions in \({\mathbb R}^m\)

    José Luis Serrano Ricardo, Ricardo Abreu Blaya, Jorge Sánchez Ortiz in Analysis and Mathematical Physics
    Article 10 October 2023
  15. Positivity results for Weyl’s pseudo-differential calculus on the Wiener space

    This paper deals with positivity properties for a pseudo-differential calculus, generalizing Weyl’s classical quantization, and set on an infinite...

    Article 08 May 2023
  16. Ramsey Theory Before Ramsey: Hilbert’s Theorem

    A new theory often appears in an attempt to answer new questions or to shed a new light on old problems. It is not usually born overnight. Before its...
    Chapter 2024
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