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  1. No Access

    Article

    New matching theorems for admissible type maps in topological vector spaces

    Using fixed (coincidence) point theory in the literature we present a variety of matching type results for general admissble maps.

    Donal O’Regan in Rendiconti del Circolo Matematico di Palermo Series 2 (2024)

  2. No Access

    Article

    Coincidence theory for better admissible multifunctions

    In this paper we present a variety of coincidence results for different classes of maps and we then show how this theory will generate some Ky Fan matching type results.

    Donal O’Regan in The Journal of Analysis (2024)

  3. No Access

    Article

    A note on homotopy extension KKM type maps

    In this paper we present a variety of continuation (homotopy) theorems for general classes of maps in the literature.

    Donal O’Regan in Aequationes mathematicae (2024)

  4. No Access

    Article

    Intersection results for general classes of maps

    In this paper we use new coincidence theorems of the author to obtain a variety of Ky Fan matching type theorems for open coverings related to the map or maps. To establish our new matching results, we conside...

    Donal O’Regan in Indian Journal of Pure and Applied Mathematics (2024)

  5. Article

    Open Access

    An application of decision theory on the approximation of a generalized Apollonius-type quadratic functional equation

    To make better decisions on approximation, we may need to increase reliable and useful information on different aspects of approximation. To enhance information about the quality and certainty of approximating...

    Azam Ahadi, Reza Saadati, Tofigh Allahviranloo in Journal of Inequalities and Applications (2024)

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    Article

    Nontrivial Solutions for a First-order Impulsive Integral Boundary Value Problem on Time Scales

    In this paper we use topological degree to study the solvability for a first-order impulsive integral boundary value problem on time scales. We first construct a linear operator, and then obtain the existence ...

    Yanfang Li, Donal O’Regan, Jiafa Xu in Qualitative Theory of Dynamical Systems (2024)

  7. No Access

    Article

    The uniqueness of some singular Kirchhoff equations with non-homogeneous material

    In this paper, on the one hand, we prove a new theorem of sub-supersolution method for a generalized Kirchhoff equations with non-homogeneous material; on the other hand, based on the method of lower and upper...

    Baoqiang Yan, Donal O’Regan, Ravi P. Agarwal in Indian Journal of Pure and Applied Mathema… (2023)

  8. Article

    Open Access

    A note on noncompact collectively coincidence point theory

    In this paper we present a variety of collectively fixed point and coincidence point results where the maps are not necessarily compact. Our arguments are based on a very general fixed point result in the lite...

    Donal O’Regan in Periodica Mathematica Hungarica (2023)

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    Article

    Collectively Coincidence Results and Selecting Families

    In this paper we will make use of Brouwer’s fixed point theorem to obtain collectively coincidence point results for multivalued maps belonging to similar classes.

    Donal O’Regan in Bulletin of the Iranian Mathematical Society (2023)

  10. No Access

    Article

    Bounded Variation Solution for a Class of Kirchhoff Type Problem Involving the 1-Laplacian Operator

    In this work, we study the existence of a nontrivial bounded variation solution to a class of nonlocal elliptic problems of Kirchhoff type involving the 1-Laplacian operator in the whole space

    Rui Liu, Lin Li, Donal O’Regan in Qualitative Theory of Dynamical Systems (2023)

  11. No Access

    Article

    Multiplicity of Solutions of Dirichlet Second Order Boundary Value Problems with Derivative Dependance

    In this paper we present some theorems on the multiplicity of fixed points of some operators on a special wedge and using these results we consider ...

    Baoqiang Yan, Donal O’Regan in Differential Equations and Dynamical Systems (2023)

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    Article

    Selecting Families and Coincidence Theory

    Using a fixed point result of the author we establish a variety of new collectively coincidence point results between different classes of multivalued maps.

    Donal O’Regan in Results in Mathematics (2023)

  13. No Access

    Article

    Continuous selecting families and collectively fixed point theory

    A variety of existence theorems for a collective family of set-valued maps are presented. Our results are deduced from fixed point theory for single valued maps associated with the original family.

    Donal O’Regan in Aequationes mathematicae (2023)

  14. No Access

    Article

    Exponential stability of a geometric nonlinear beam with a nonlinear delay term in boundary feedbacks

    This paper is concerned with the stabilization of a geometric nonlinear beam with a nonlinear delay term in boundary control. The well-posedness of the closed-loop system where a nonlinear dam** and a nonlin...

    Cuiying Li, Yi Cheng, Donal O’Regan in Zeitschrift für angewandte Mathematik und Physik (2023)

  15. No Access

    Article

    Fixed point theorems in generalized Banach spaces under G-weak topology features

    In this paper we extend some fixed point results in generalized Banach spaces endowed with the so-called G-weak topology and having the generalized Dunford–Pettis property (in short, G-DP property). Our main r...

    Ahmed Boudaoui, Bilel Krichen, Noura Laksaci in Indian Journal of Pure and Applied Mathema… (2023)

  16. No Access

    Article

    Continuous selections and collectively fixed point theory with applications to generalized games

    Using a combination of new and old ideas we present some new collectively fixed point theorems which will then generate some new equilibrium results for generalized games.

    Donal O’Regan in Aequationes mathematicae (2023)

  17. No Access

    Article

    Best approximations of Stochastic bi-homomorphisms and bi-derivations in MC- \(\diamond\) -algebras

    We apply stochastic controllers to stable the pseudo stochastic bi-homomorphisms and stochastic bi-derivations in MB-algebra and unital MC- $$\...

    Nguyen Huy Tuan, Reza Saadati, Donal O’Regan in Rendiconti del Circolo Matematico di Paler… (2023)

  18. Article

    Open Access

    A simple proof for Imnang’s algorithms

    In this paper, a simple proof of the convergence of the recent iterative algorithm by relaxed ( u ...

    Ebrahim Soori, Donal O’Regan, Ravi P. Agarwal in Journal of Inequalities and Applications (2022)

  19. No Access

    Article

    A Strong Convergence Theorem for Solving an Equilibrium Problem and a Fixed Point Problem Using the Bregman Distance

    In this paper, using the Bregman distance, we introduce a new projection-type algorithm for finding a common element of the set of solutions of an equilibrium problem and the set of fixed points. Then the stro...

    Mostafa Ghadampour, Ebrahim Soori in Journal of Optimization Theory and Applica… (2022)

  20. No Access

    Article

    Robustness for Non-instantaneous Impulsive Equations via Quadratic Lyapunov Functions

    In this paper, we introduce an impulsive evolution operator and Lyapunov functions for a linear system and obtain relations between them under suitable conditions. Those relations are used to investigate nonun...

    Mengmeng Li, **Rong Wang, Donal O’Regan in Bulletin of the Malaysian Mathematical Sci… (2022)

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