Periodic and almost periodic solutions of integral equations. - Donal O'Regan; Maria Meehan (Appl. Math. Comput., 1999)

A coupled system of difference equations. - Ravi P. Agarwal; Donal O'Regan (Appl. Math. Comput., 2000)

Multiple nonnegative solutions for second order impulsive differential equations. - Ravi P. Agarwal; Donal O'Regan (Appl. Math. Comput., 2000)

Multivalued essential maps of approximable and acyclic type. - Ravi P. Agarwal; Donal O'Regan (Appl. Math. Lett., 2000)

Singular Volterra integral equations. - Ravi P. Agarwal; Donal O'Regan (Appl. Math. Lett., 2000)

Existence results for singular integral equations of fredholm type. - Ravi P. Agarwal; Donal O'Regan (Appl. Math. Lett., 2000)

Essential and inessential maps and continuation theorems. - Ravi P. Agarwal; Donal O'Regan (Appl. Math. Lett., 2000)

Discrete conjugate boundary value problems. - Ravi P. Agarwal; Donal O'Regan (Appl. Math. Lett., 2000)

Triple solutions to boundary value problems on time scales. - Ravi P. Agarwal; Donal O'Regan (Appl. Math. Lett., 2000)

Weakly inward zero epi maps. - Donal O'Regan (Appl. Math. Lett., 2000)

A generalization of the Petryshyn-Leggett-Williams fixed point theorem with applications to integral inclusions. - Ravi P. Agarwal; Donal O'Regan (Appl. Math. Comput., 2001)

Fixed-point theorems for multivalued maps with closed values on complete gauge spaces. - Ravi P. Agarwal; Donal O'Regan (Appl. Math. Lett., 2001)

Variational inequalities, coincidence theory, and minimax inequalities. - Ravi P. Agarwal; Donal O'Regan (Appl. Math. Lett., 2001)

Multiple positive solutions for the one-dimensional singular p-Laplacian. - Haishen Lü; Donal O'Regan; Chengkui Zhong (Appl. Math. Comput., 2002)

Countably P-Concentrative Pairs and the coincidence index. - Ravi P. Agarwal; Donal O'Regan (Appl. Math. Lett., 2002)

Fuzzy contractive maps and fuzzy fixed points. - Marlène Frigon; Donal O'Regan (Fuzzy Sets Syst., 2002)

Existence theorems for the one-dimensional singular p–Laplacian equation with sign changing nonlinearities. - Ravi P. Agarwal; Haishen Lü; Donal O'Regan (Appl. Math. Comput., 2003)

Fixed-point theorems for S-KKM maps. - Ravi P. Agarwal; Donal O'Regan (Appl. Math. Lett., 2003)

An index theory for countably P-concentrative J maps. - Ravi P. Agarwal; Donal O'Regan (Appl. Math. Lett., 2003)

Existence of solutions for first order ordinary differential equations with nonlinear boundary conditions. - Daniel Franco 001; Juan J. Nieto 001; Donal O'Regan (Appl. Math. Comput., 2004)

Semipositone higher-order differential equations. - Ravi P. Agarwal; Said R. Grace; Donal O'Regan (Appl. Math. Lett., 2004)

Optimal existence conditions for second order periodic solutions of delay differential equations with upper and lower solutions in the reverse order. - Daqing Jiang; Wenjie Zuo; Donal O'Regan; Ravi P. Agarwal (Int. J. Comput. Math., 2004)

A Furi-Pera theorem in Hausdorff topological spaces for acyclic maps. - Ravi P. Agarwal; Jewgeni H. Dshalalow; Donal O'Regan (Int. J. Math. Math. Sci., 2004)

A multiplicity result for second order impulsive differential equations via the Leggett Williams fixed point theorem. - Ravi P. Agarwal; Donal O'Regan (Appl. Math. Comput., 2005)

Nonresonant singular boundary value problems with sign changing nonlinearities. - Ravi P. Agarwal; Donal O'Regan; V. Lakshmikantham; S. Leela (Appl. Math. Comput., 2005)

Optimal existence theory for single and multiple positive periodic solutions to functional difference equations. - Daqing Jiang; Donal O'Regan; Ravi P. Agarwal (Appl. Math. Comput., 2005)

Positive solutions for singular p-Laplacian equations with sign changing nonlinearities using inequality theory. - Haishen Lü; Donal O'Regan; Ravi P. Agarwal (Appl. Math. Comput., 2005)

A note on the topological transversality theorem for acyclic maps. - Ravi P. Agarwal; Donal O'Regan (Appl. Math. Lett., 2005)

Homotopy and normalization properties for admissible maps. - Ravi P. Agarwal; Donal O'Regan (Appl. Math. Lett., 2005)

On perturbations of accretive mappings. - Yuqing Chen; Yeol Je Cho; Donal O'Regan (Appl. Math. Lett., 2005)

Viability theory and fuzzy differential equations. - Ravi P. Agarwal; Donal O'Regan; V. Lakshmikantham (Fuzzy Sets Syst., 2005)

Fixed point theory for Mönch-type maps defined on closed subsets of Fréchet spaces: the projective limit approach. - Ravi P. Agarwal; Jewgeni H. Dshalalow; Donal O'Regan (Int. J. Math. Math. Sci., 2005)

Oscillation of functional differential equations. - Ravi P. Agarwal; Said R. Grace; Ivan Kiguradze; Donal O'Regan (Math. Comput. Model., 2005)

Volterra-stieltjes integral operators. - Józef Banas; Donal O'Regan (Math. Comput. Model., 2005)

Integral operators of Urysohn-Stieltjes type. - Józef Banas; Donal O'Regan (Period. Math. Hung., 2005)

Common fixed point theorems in S-fuzzy metric spaces. - Hojatollah Adibi; Yeol Je Cho; Donal O'Regan; Reza Saadati (Appl. Math. Comput., 2006)

Leray-Schauder and Krasnoselskii results for multivalued maps defined on pseudo-open subsets of a Fréchet space. - Ravi P. Agarwal; Donal O'Regan (Appl. Math. Lett., 2006)

Leray-Schauder results for inward acyclic and approximable maps defined on Fréchet spaces. - Donal O'Regan (Appl. Math. Lett., 2006)

Leray-Schauder results for multivalued nonlinear contractions defined on closed subsets of a Fréchet space. - Ravi P. Agarwal; Donal O'Regan (Int. J. Math. Math. Sci., 2006)

Constant-sign solutions of systems of higher order boundary value problems with integrable singularities. - Ravi P. Agarwal; Donal O'Regan; Patricia J. Y. Wong (Math. Comput. Model., 2006)

Leggett-Williams norm-type fixed point theorems for multivalued mappings. - Donal O'Regan; Miroslawa Zima (Appl. Math. Comput., 2007)

Second order initial value problems of Lane-Emden type. - Ravi P. Agarwal; Donal O'Regan (Appl. Math. Lett., 2007)

Nonlinear integral equations singular in the dependent variable. - Donal O'Regan; Ravi P. Agarwal; Kanishka Perera (Appl. Math. Lett., 2007)

Positive and dead core solutions of singular Dirichlet boundary value problems with phi-Laplacian. - Ravi P. Agarwal; Donal O'Regan; Svatoslav Stanek (Comput. Math. Appl., 2007)

Constant-sign solutions of a system of Volterra integral equations. - Ravi P. Agarwal; Donal O'Regan; Christopher C. Tisdell; Patricia J. Y. Wong (Comput. Math. Appl., 2007)

The periodic boundary value problem for semilinear elastic beam equations: The resonance case. - Jinhai Chen; Donal O'Regan (Comput. Math. Appl., 2007)

Anti-periodic solutions for fully nonlinear first-order differential equations. - Yuqing Chen; Juan J. Nieto 001; Donal O'Regan (Math. Comput. Model., 2007)

Multiplicity results for three-point boundary value problems with a non-well-ordered upper and lower solution condition. - Xu Xian; Donal O'Regan; Jingxian Sun 001 (Math. Comput. Model., 2007)

Multiple positive solutions for singular problems with mixed boundary data and derivative dependence. - Baoqiang Yan; Donal O'Regan; Ravi P. Agarwal (Math. Comput. Model., 2007)

Oscillation and global attractivity in a delay periodic host macroparasite model. - Ravi P. Agarwal; Donal O'Regan; S. H. Saker (Appl. Math. Comput., 2008)

A common fixed point theorem for R-weakly commuting mappings in probabilistic spaces with nonlinear contractive conditions. - Sinisa N. Jesic; Donal O'Regan; Natasa A. Babacev (Appl. Math. Comput., 2008)

Singular integral equations arising in draining and coating flows. - Donal O'Regan (Appl. Math. Comput., 2008)

Nonlinear contraction theorems in probabilistic spaces. - Donal O'Regan; Reza Saadati (Appl. Math. Comput., 2008)

Degree theory for (S+) mappings in non-reflexive banach spaces. - Fulong Wang; Yuqing Chen; Donal O'Regan (Appl. Math. Comput., 2008)

Existence and uniqueness of positive solutions for fourth-order nonlinear singular continuous and discrete boundary value problems. - Chengjun Yuan; Daqing Jiang; Donal O'Regan (Appl. Math. Comput., 2008)

Existence theory for multiple solutions to semipositone Dirichlet boundary value problems with singular dependent nonlinearities for second-order impulsive differential equations. - Li Zu; Daqing Jiang; Donal O'Regan (Appl. Math. Comput., 2008)

Four functionals fixed point theorem. - Richard Avery; Johnny Henderson; Donal O'Regan (Math. Comput. Model., 2008)

B-Separable boundary value problems in Banach-valued function spaces. - Ravi P. Agarwal; Donal O'Regan; Veli B. Shakhmurov (Appl. Math. Comput., 2009)

On the homotopy property of topological degree for maximal monotone mappings. - Yuqing Chen; Donal O'Regan (Appl. Math. Comput., 2009)

The fixed point index for compact absorbing contractive admissible maps. - Donal O'Regan (Appl. Math. Comput., 2009)

Positive solutions for singular second order Neumann boundary value problems via a cone fixed point theorem. - Yan Sun; Yeol Je Cho; Donal O'Regan (Appl. Math. Comput., 2009)

Generalized degree for classes of finite dimensional upper hemi-continuous mappings in separable Banach spaces. - Fulong Wang; Yuqing Chen; Donal O'Regan (Appl. Math. Comput., 2009)

Higher order nonlinear degenerate differential operator equations. - Ravi P. Agarwal; Donal O'Regan; Veli B. Shakhmurov (Appl. Math. Lett., 2009)

A note on the degree for maximal monotone mappings in finite dimensional spaces. - Yuqing Chen; Donal O'Regan; Fulong Wang; Ravi P. Agarwal (Appl. Math. Lett., 2009)

New kinds of generalized variational-like inequality problems in topological vector spaces. - Ali P. Farajzadeh; A. Amini-Harandi; Donal O'Regan; Ravi P. Agarwal (Appl. Math. Lett., 2009)

A selection of oscillation criteria for second-order differential inclusions. - Said R. Grace; Ravi P. Agarwal; Donal O'Regan (Appl. Math. Lett., 2009)

Degree theory for monotone type mappings in non-reflexive Banach spaces. - Fulong Wang; Yuqing Chen; Donal O'Regan (Appl. Math. Lett., 2009)

Controllability of Volterra-Fredholm type systems in Banach spaces. - Eduardo Hernández Morales; Donal O'Regan (J. Frankl. Inst., 2009)

Constant-sign solutions for systems of singular integral equations of Hammerstein type. - Ravi P. Agarwal; Donal O'Regan; Patricia J. Y. Wong (Math. Comput. Model., 2009)

Type I operators and the approximation of singular two-point boundary value problems. - Mohamed A. El-Gebeily; Donal O'Regan; Salim Messauodi (Appl. Math. Comput., 2010)

Essential extension type maps for general classes of maps. - Donal O'Regan (Appl. Math. Comput., 2010)

Bounds for analytic solutions to integral equations in the complex domain. - Ravi P. Agarwal; Donal O'Regan; Sandra Pinelas (Appl. Math. Lett., 2010)

Anti-periodic solutions for evolution equations associated with monotone type mappings. - Yuqing Chen; Donal O'Regan; Ravi P. Agarwal (Appl. Math. Lett., 2010)

Periodic constant-sign solutions for systems of Hill's equations. - Ravi P. Agarwal; Donal O'Regan; Patricia J. Y. Wong (Asymptot. Anal., 2010)

Strong convergence theorems for relatively nonexpansive mappings in Banach spaces with applications. - Xi Li; Nan-Jing Huang; Donal O'Regan (Comput. Math. Appl., 2010)

A monotone iterative technique for stationary and time dependent problems in Banach spaces. - Mohamed A. El-Gebeily; Donal O'Regan; Juan J. Nieto 001 (J. Comput. Appl. Math., 2010)

Uniform separable differential operators with parameters. - Ravi P. Agarwal; Donal O'Regan; Veli B. Shakhmurov (J. Frankl. Inst., 2010)

Infinitely many weak solutions for a class of quasilinear elliptic systems. - Gabriele Bonanno; Giovanni Molica Bisci; Donal O'Regan (Math. Comput. Model., 2010)

Applications of linking to Hammerstein integral equations. - Donal O'Regan (Appl. Math. Comput., 2011)

Eigenvalue intervals for higher order problems with singular nonlinearities. - Donal O'Regan; Aleksandra Orpel (Appl. Math. Comput., 2011)

Anti-periodic solutions for evolution equations associated with maximal monotone mappings. - Yuqing Chen; Juan J. Nieto 001; Donal O'Regan (Appl. Math. Lett., 2011)

Stability of some set-valued functional equations. - Choonkil Park; Donal O'Regan; Reza Saadati (Appl. Math. Lett., 2011)

Non-trivial solutions for nonlinear fourth-order elastic beam equations. - Gabriele Bonanno; Beatrice Di Bella; Donal O'Regan (Comput. Math. Appl., 2011)

Characterization of self-adjoint ordinary differential operators. - Mohamed A. El-Gebeily; Donal O'Regan; Ravi P. Agarwal (Math. Comput. Model., 2011)

On a new class of abstract integral equations and applications. - Eduardo Hernández Morales; Donal O'Regan; Maria Aparecida Bená (Appl. Math. Comput., 2012)

Coincidence theory for multimaps. - Donal O'Regan (Appl. Math. Comput., 2012)

A variational approach to the eigenvalue problem for higher order BVPs with singular nonlinearities. - Donal O'Regan; Aleksandra Orpel (Appl. Math. Comput., 2012)

Gaps between zeros of second-order half-linear differential equations. - S. H. Saker; Ravi P. Agarwal; Donal O'Regan (Appl. Math. Comput., 2012)

A Unifying Approach to Variational Relation Problems. - Ravi P. Agarwal; Mircea Balaj; Donal O'Regan (J. Optim. Theory Appl., 2012)

Stability analysis of generalized impulsive functional differential equations. - Diwang Lin; Xiaodi Li 001; Donal O'Regan (Math. Comput. Model., 2012)

Positive solutions of a focal problem for one-dimensional p-Laplacian equations. - Zhilin Yang 003; Donal O'Regan (Math. Comput. Model., 2012)

Existence of solutions for semi-linear abstract differential equations with not instantaneous impulses. - Michelle Pierri; Donal O'Regan; Vanessa Rolnik (Appl. Math. Comput., 2013)

Almost periodic solutions for a Volterra model with mutual interference and Holling type III functional response. - Cong Zhang; Nan-Jing Huang; Donal O'Regan (Appl. Math. Comput., 2013)

Fixed points and exponential stability for a stochastic neutral cellular neural network. - Chengjun Guo; Donal O'Regan; Feiqi Deng; Ravi P. Agarwal (Appl. Math. Lett., 2013)

A New Gap Function for Vector Variational Inequalities with an Application. - Hui-qiang Ma; Nan-Jing Huang; Meng Wu; Donal O'Regan (J. Appl. Math., 2013)

Well-posedness for generalized quasi-variational inclusion problems and for optimization problems with constraints. - San-hua Wang; Nan-Jing Huang; Donal O'Regan (J. Glob. Optim., 2013)

Comments on Some Recent Results on Controllability of Abstract Differential Problems. - Eduardo Hernández Morales; Donal O'Regan; Krishnan Balachandran (J. Optim. Theory Appl., 2013)

The theory of pseudo-linear operators. - Barnabás Bede; Donal O'Regan (Knowl. Based Syst., 2013)

Nonautonomous impulsive systems with unbounded nonlinear terms. - Xiaoqing Yuan; Yong-Hui Xia; Donal O'Regan (Appl. Math. Comput., 2014)

The long time behavior of a predator-prey model with disease in the prey by stochastic perturbation. - Qiumei Zhang; Daqing Jiang; Zhenwen Liu; Donal O'Regan (Appl. Math. Comput., 2014)

Existence of weak solutions for a fourth-order Navier boundary value problem. - Jiafa Xu; Wei Dong; Donal O'Regan (Appl. Math. Lett., 2014)

Geodesic B-Preinvex Functions and Multiobjective Optimization Problems on Riemannian Manifolds. - Sheng-lan Chen; Nan-Jing Huang; Donal O'Regan (J. Appl. Math., 2014)

Refinements of Generalized Hölder's Inequalities. - Jingfeng Tian; Wen-Li Wang; Donal O'Regan (J. Appl. Math., 2014)

pth Moment exponential stability of impulsive stochastic functional differential equations and application to control problems of NNs. - Xiaodi Li 001; Quanxin Zhu; Donal O'Regan (J. Frankl. Inst., 2014)

A Common Fixed Point Theorem with Applications. - Ravi P. Agarwal; Mircea Balaj; Donal O'Regan (J. Optim. Theory Appl., 2014)

A Kamenev-type oscillation result for a linear (1+α)-order fractional differential equation. - Dumitru Baleanu; Octavian G. Mustafa; Donal O'Regan (Appl. Math. Comput., 2015)

Fractional calculus and fractional differential equations in nonreflexive Banach spaces. - Ravi P. Agarwal; Vasile Lupulescu; Donal O'Regan; Ghaus ur Rahman (Commun. Nonlinear Sci. Numer. Simul., 2015)

Conditions for persistence and ergodicity of a stochastic Lotka-Volterra predator-prey model with regime switching. - Li Zu; Daqing Jiang; Donal O'Regan (Commun. Nonlinear Sci. Numer. Simul., 2015)

Generalized Well-Posedness for Symmetric Vector Quasi-Equilibrium Problems. - Wei-bing Zhang; Nan-Jing Huang; Donal O'Regan (J. Appl. Math., 2015)

Extremal solutions for nonlinear fractional boundary value problems with p-Laplacian. - Youzheng Ding; Zhongli Wei; Jiafa Xu; Donal O'Regan (J. Comput. Appl. Math., 2015)

The periodic solutions of a stochastic chemostat model with periodic washout rate. - Liang Wang; Daqing Jiang; Donal O'Regan (Commun. Nonlinear Sci. Numer. Simul., 2016)

A class of impulsive differential variational inequalities in finite dimensional spaces. - Xue-song Li; Nan-Jing Huang; Donal O'Regan (J. Frankl. Inst., 2016)

Global dissipativity of memristor-based complex-valued neural networks with time-varying delays. - R. Rakkiyappan; G. Velmurugan; Xiaodi Li 001; Donal O'Regan (Neural Comput. Appl., 2016)

Monotone iterative technique for the initial value problem for differential equations with non-instantaneous impulses. - Ravi P. Agarwal; Donal O'Regan; Snezhana G. Hristova (Appl. Math. Comput., 2017)

Practical stability with respect to initial time difference for Caputo fractional differential equations. - Ravi P. Agarwal; Donal O'Regan; Snezhana G. Hristova; Muhammed Çiçek (Commun. Nonlinear Sci. Numer. Simul., 2017)

Solving interval-valued fractional initial value problems under Caputo gH-fractional differentiability. - Ngo Van Hoa; Vasile Lupulescu; Donal O'Regan (Fuzzy Sets Syst., 2017)

Noninstantaneous impulses in Caputo fractional differential equations and practical stability via Lyapunov functions. - Ravi P. Agarwal; Snezhana G. Hristova; Donal O'Regan (J. Frankl. Inst., 2017)

Asymptotic properties of the solutions of nonlinear non-instantaneous impulsive differential equations. - Dan Yang; JinRong Wang 001; Donal O'Regan (J. Frankl. Inst., 2017)

Common Fixed Point Theorems in Topological Vector Spaces via Intersection Theorems. - Ravi P. Agarwal; Mircea Balaj; Donal O'Regan (J. Optim. Theory Appl., 2017)

Iterative techniques for the initial value problem for Caputo fractional differential equations with non-instantaneous impulses. - Ravi P. Agarwal; Snezhana G. Hristova; Donal O'Regan (Appl. Math. Comput., 2018)

Coincidence for morphisms based on compactness conditions on countable sets. - Donal O'Regan (Appl. Math. Comput., 2018)

A class of nonlinear non-instantaneous impulsive differential equations involving parameters and fractional order. - Dan Yang; JinRong Wang 001; Donal O'Regan (Appl. Math. Comput., 2018)

Ergodic property of a Lotka-Volterra predator-prey model with white noise higher order perturbation under regime switching. - Li Zu; Daqing Jiang; Donal O'Regan; Tasawar Hayat; Bashir Ahmad 003 (Appl. Math. Comput., 2018)

On state dependent non-local conditions. - Eduardo Hernández Morales; Donal O'Regan (Appl. Math. Lett., 2018)

Representation of a solution for a fractional linear system with pure delay. - Chengbin Liang; JinRong Wang 001; Donal O'Regan (Appl. Math. Lett., 2018)

Lyapunov Functions to Caputo Fractional Neural Networks with Time-Varying Delays. - Ravi P. Agarwal; Snezhana G. Hristova; Donal O'Regan (Axioms, 2018)

A note on initial value problems for fractional fuzzy differential equations. - Ngo Van Hoa; Vasile Lupulescu; Donal O'Regan (Fuzzy Sets Syst., 2018)

Intersection Theorems with Applications in Optimization. - Ravi P. Agarwal; Mircea Balaj; Donal O'Regan (J. Optim. Theory Appl., 2018)

Global Mittag - Leffler Synchronization for Neural Networks Modeled by Impulsive Caputo Fractional Differential Equations with Distributed Delays. - Ravi P. Agarwal; Snezhana G. Hristova; Donal O'Regan (Symmetry, 2018)

Asymptotic stability of solutions of impulsive multi-delay differential equations. - Zhongli You; Jinrong Wang 001; Donal O'Regan (Trans. Inst. Meas. Control, 2018)

Iterative learning control for differential inclusions of parabolic type with noninstantaneous impulses. - Shengda Liu; JinRong Wang 001; Dong Shen; Donal O'Regan (Appl. Math. Comput., 2019)

Lipschitz Stability for Non-Instantaneous Impulsive Caputo Fractional Differential Equations with State Dependent Delays. - Ravi P. Agarwal; Snezhana G. Hristova; Donal O'Regan (Axioms, 2019)

Existence and uniqueness of mild solutions for a final value problem for nonlinear fractional diffusion systems. - Bao Ngoc Tran; Nguyen Huy Tuan; Donal O'Regan (Commun. Nonlinear Sci. Numer. Simul., 2019)

Inertial manifold for semi-linear non-instantaneous impulsive parabolic equations in an admissible space. - Peng Yang; JinRong Wang 001; Donal O'Regan; Michal Feckan (Commun. Nonlinear Sci. Numer. Simul., 2019)

Calculus of fuzzy vector-valued functions and almost periodic fuzzy vector-valued functions on time scales. - Chao Wang 006; Ravi P. Agarwal; Donal O'Regan (Fuzzy Sets Syst., 2019)

On the approximate controllability for fractional evolution inclusions of Sobolev and Clarke subdifferential type. - Xianghu Liu; JinRong Wang 001; Donal O'Regan (IMA J. Math. Control. Inf., 2019)

Basic Concepts of Riemann-Liouville Fractional Differential Equations with Non-Instantaneous Impulses. - Ravi P. Agarwal; Snezhana G. Hristova; Donal O'Regan (Symmetry, 2019)

Hyers-Ulam Stability for Linear Differences with Time Dependent and Periodic Coefficients: The Case When the Monodromy Matrix Has Simple Eigenvalues. - Constantin Buse; Donal O'Regan; Olivia Saierli (Symmetry, 2019)

Hyers-Ulam Stability for Linear Differences with Time Dependent and Periodic Coefficients. - Constantin Buse; Donal O'Regan; Olivia Saierli (Symmetry, 2019)

Iterative Algorithm for Solving Scalar Fractional Differential Equations with Riemann-Liouville Derivative and Supremum. - Ravi P. Agarwal; Snezhana G. Hristova; Donal O'Regan; Kremena Stefanova (Algorithms, 2020)

On a terminal value problem for pseudoparabolic equations involving Riemann-Liouville fractional derivatives. - Bao Ngoc Tran; Yong Zhou 005; Donal O'Regan; Nguyen Huy Tuan (Appl. Math. Lett., 2020)

Coincidence Continuation Theory for Multivalued Maps with Selections in a Given Class. - Donal O'Regan (Axioms, 2020)

Existence of solutions for a new class of fuzzy differential inclusions with resolvent operators in Banach spaces. - Nguyen Van Hung; Vo Minh Tam; Donal O'Regan (Comput. Appl. Math., 2020)

Approximate solution of the backward problem for Kirchhoff's model of Parabolic type with discrete random noise. - Nguyen Anh Triet; Duc Phuong Nguyen; Donal O'Regan; Nguyen Huy Tuan (Comput. Math. Appl., 2020)

On well-posedness of the sub-diffusion equation with conformable derivative model. - Nguyen Huy Tuan; Bao Ngoc Tran; Dumitru Baleanu; Donal O'Regan (Commun. Nonlinear Sci. Numer. Simul., 2020)

Positive Solutions for a System of Hadamard-Type Fractional Differential Equations with Semipositone Nonlinearities. - Youzheng Ding; Jiqiang Jiang; Donal O'Regan; Jiafa Xu (Complex., 2020)

Two-Parameter Regularization Method for a Nonlinear Backward Heat Problem with a Conformable Derivative. - Vu Ho 001; Donal O'Regan; Ngo Van Hoa (Complex., 2020)

Regularized gap functions and error bounds for generalized mixed weak vector quasivariational inequality problems in fuzzy environments. - Nguyen Van Hung; Vo Minh Tam; Nguyen Huy Tuan; Donal O'Regan (Fuzzy Sets Syst., 2020)

On the solutions of first-order linear impulsive fuzzy differential equations. - Rui Liu; JinRong Wang 001; Donal O'Regan (Fuzzy Sets Syst., 2020)

Ulam type stability of first-order linear impulsive fuzzy differential equations. - Rui Liu; JinRong Wang 001; Donal O'Regan (Fuzzy Sets Syst., 2020)

An Initial Value Problem Involving Caputo-Hadamard Fractional Derivative: The Extremal Solutions and Stabilization. - Donal O'Regan; Ngo Van Hoa (J. Adv. Eng. Comput., 2020)

A new class of generalized multiobjective games in bounded rationality with fuzzy mappings: Structural (λ, ε)-stability and (λ, ε)-robustness to ε-equilibria. - Nguyen Van Hung; Vo Minh Tam; Donal O'Regan; Yeol Je Cho (J. Comput. Appl. Math., 2020)

Convergence analysis of solution sets for fuzzy optimization problems. - Nguyen Van Hung; Vo Minh Tam; Nguyen Huy Tuan; Donal O'Regan (J. Comput. Appl. Math., 2020)

Final value problem for nonlinear time fractional reaction-diffusion equation with discrete data. - Nguyen Huy Tuan; Dumitru Baleanu; Tran Ngoc Thach; Donal O'Regan; Nguyen Huu Can (J. Comput. Appl. Math., 2020)

Impulsive Evolution Equations with Causal Operators. - Tahira Jabeen; Ravi P. Agarwal; Vasile Lupulescu; Donal O'Regan (Symmetry, 2020)

Quadratic Lyapunov Functions for Stability of the Generalized Proportional Fractional Differential Equations with Applications to Neural Networks. - Ricardo Almeida 001; Ravi P. Agarwal; Snezhana G. Hristova; Donal O'Regan (Axioms, 2021)

A new derivative concept for set-valued and fuzzy-valued functions. Differential and integral calculus in quasilinear metric spaces. - Vasile Lupulescu; Donal O'Regan (Fuzzy Sets Syst., 2021)

Lyapunov Functions and Lipschitz Stability for Riemann-Liouville Non-Instantaneous Impulsive Fractional Differential Equations. - Ravi P. Agarwal; Snezhana G. Hristova; Donal O'Regan (Symmetry, 2021)

Coincidence Theory in the Coercive Case and Minimax Inequalities. - Donal O'Regan (Symmetry, 2021)

Maximal Type Elements for Families. - Donal O'Regan (Symmetry, 2021)

Modular Stability Analysis of a Nonlinear Stochastic Fractional Volterra IDE. - Azam Ahadi; Zahra Eidinejad; Reza Saadati; Donal O'Regan (Algorithms, 2022)

Controllability Results for First Order Impulsive Fuzzy Differential Systems. - Rui Liu; Michal Feckan; Donal O'Regan; Jinrong Wang 001 (Axioms, 2022)

g-Expectation for Conformable Backward Stochastic Differential Equations. - Mei Luo; Michal Feckan; Jin-Rong Wang 001; Donal O'Regan (Axioms, 2022)

Stability of Gene Regulatory Networks Modeled by Generalized Proportional Caputo Fractional Differential Equations. - Ricardo Almeida 001; Ravi P. Agarwal; Snezhana G. Hristova; Donal O'Regan (Entropy, 2022)

An existence result for a new class of fuzzy fractional differential inclusions with Clarke's subdifferential via resolvent operators in Banach spaces. - Vo Minh Tam; Nguyen Van Hung; Donal O'Regan (Fuzzy Sets Syst., 2022)

Ulam type stability for first-order linear and nonlinear impulsive fuzzy differential equations. - Rui Liu; Michal Feckan; Jinrong Wang 001; Donal O'Regan (Int. J. Comput. Math., 2022)

A Strong Convergence Theorem for Solving an Equilibrium Problem and a Fixed Point Problem Using the Bregman Distance. - Mostafa Ghadampour; Ebrahim Soori; Ravi P. Agarwal; Donal O'Regan (J. Optim. Theory Appl., 2022)

Mittag-Leffler Type Stability of Delay Generalized Proportional Caputo Fractional Differential Equations: Cases of Non-Instantaneous Impulses, Instantaneous Impulses and without Impulses. - Ravi P. Agarwal; Snezhana G. Hristova; Donal O'Regan (Symmetry, 2022)

Minimum Superstability of Stochastic Ternary Antiderivations in Symmetric Matrix-Valued FB-Algebras and Symmetric Matrix-Valued FC-⋄-Algebras. - Zahra Eidinejad; Reza Saadati; Donal O'Regan; Fehaid Salem Alshammari (Symmetry, 2022)

Fuzzy Control Problem via Random Multi-Valued Equations in Symmetric F-n-NLS. - Reza Saadati; Tofigh Allahviranloo; Donal O'Regan; Fehaid Salem Alshammari (Symmetry, 2022)

New Hermite-Hadamard Type Inequalities in Connection with Interval-Valued Generalized Harmonically (h1, h2)-Godunova-Levin Functions. - Soubhagya Kumar Sahoo; Pshtiwan Othman Mohammed; Donal O'Regan; Muhammad Tariq; Kamsing Nonlaopon (Symmetry, 2022)

Positive Solutions for a High-Order Riemann-Liouville Type Fractional Integral Boundary Value Problem Involving Fractional Derivatives. - Wuyang Wang; Jun Ye; Jiafa Xu; Donal O'Regan (Symmetry, 2022)

Vector-valued functions on time scales and random differential equations. - Martin Bohner; Vasile Lupulescu; Donal O'Regan; Waqas Ali Azhar (Comput. Appl. Math., 2022)

Boundary Value Problems for Fractional Differential Equations of Caputo Type and Ulam Type Stability: Basic Concepts and Study. - Ravi P. Agarwal; Snezhana G. Hristova; Donal O'Regan (Axioms, 2023)

Mittag-Leffler-Type Stability of BAM Neural Networks Modeled by the Generalized Proportional Riemann-Liouville Fractional Derivative. - Ravi P. Agarwal; Snezhana G. Hristova; Donal O'Regan (Axioms, 2023)

Solvability of a Boundary Value Problem Involving Fractional Difference Equations. - Zhiwei Lv; Chun Wu; Donal O'Regan; Jiafa Xu (Axioms, 2023)

Stability of non-instantaneous impulsive systems in Hilbert spaces. - Mengmeng Li; Jin Rong Wang 001; Donal O'Regan (Commun. Nonlinear Sci. Numer. Simul., 2023)

Stability of solutions for fuzzy set optimization problems with applications. - Chuangliang Zhang; Nan-jing Huang; Donal O'Regan (Fuzzy Sets Syst., 2023)

Stability Results and Parametric Delayed Mittag-Leffler Matrices in Symmetric Fuzzy-Random Spaces with Application. - Donal O'Regan; Safoura Rezaei Aderyani; Reza Saadati; Chenkuan Li (Symmetry, 2023)

A note on noncompact collectively coincidence point theory. - Donal O'Regan (Period. Math. Hung., 2023)

Cohen-Grossberg Neural Network Delay Models with Fractional Derivatives with Respect to Another Function - Theoretical Bounds of the Solutions. - Ravi P. Agarwal; Snezhana G. Hristova; Donal O'Regan (Axioms, 2024)

Solving the Fornberg-Whitham Model Derived from Gilson-Pickering Equations by Analytical Methods. - Donal O'Regan; Safoura Rezaei Aderyani; Reza Saadati; Tofigh Allahviranloo (Axioms, 2024)

Soliton Solution of the Nonlinear Time Fractional Equations: Comprehensive Methods to Solve Physical Models. - Donal O'Regan; Safoura Rezaei Aderyani; Reza Saadati; Mustafa Inç (Axioms, 2024)