Edit Profile (opens in new tab) O’Regan, Donal Co-Author Distance Author ID: oregan.donal Published as: O’Regan, Donal; O’Regan, D.; O’Regan, Donald; O’Regan, Dónal; O’ Regan, Donal; O’regan, Donal; O’Regan, Daniel J. more...less Further Spellings: O’Regan, Daniel Joseph; О’Реган Донал Homepage: http://www.maths.nuigalway.ie/staff/doregan.shtml External Links: MGP · Wikidata · Google Scholar · Math-Net.Ru · dblp · GND · IdRef Documents Indexed: 1,605 Publications since 1986, including 29 Books and 6 Additional arXiv Preprints 10 Contributions as Editor Reviewing Activity: 38 Reviews Co-Authors: 478 Co-Authors with 1,342 Joint Publications 13,636 Co-Co-Authors all top 5 Co-Authors 271 single-authored 662 Agarwal, Ravi P. 59 Wang, Jinrong 51 Jiang, Daqing 51 Khristova, Snezhana G. 51 Saker, Samir H. 39 Grace, Said Rezk 34 Xu, Jiafa 29 Lu, Haishen 28 Nguyen Huy Tuan 28 Wong, Patricia J. Y. 27 Yan, Baoqiang 25 Papageorgiou, Nikolaos S. 23 Meehan, Maria 22 Lupulescu, Vasile 22 Saadati, Reza 22 Staněk, Svatoslav 21 Lakshmikantham, Vangipuram 20 Huang, Nan-Jing 19 El-Gebeily, Mohamed A. 19 Hernández, Eduardo M. 19 Shahzad, Naseer 19 Wang, Chao 17 Frigon, Marlène 17 Precup, Radu 15 Balaj, Mircea 15 Buşe, Constantin 14 Chen, Yuqing 14 Guo, Chengjun 14 Ntouyas, Sotiris K. 13 Cho, Yeol Je 13 Chu, Jifeng 13 Xu, Xian 12 Amini-Harandi, Alireza 12 Bonanno, Gabriele 12 Fečkan, Michal 12 Franco Leis, Daniel 12 Moussaoui, Toufik 12 Soori, Ebrahim 12 Zu, Li 11 Băleanu, Dumitru I. 11 Farajzadeh, Ali P. 11 Filippakis, Michael E. 11 Lee, John Walter 11 Zhou, Yong 10 Ben Amar, Afif 10 Bohner, Martin J. 10 Nieto Roig, Juan Jose 10 Perera, Kanishka 10 Samet, Bessem 9 Dshalalow, Jewgeni H. 9 Ibrahim, Ahmed Gamal 9 Taoudi, Mohamed Aziz 8 Banaś, Józef 8 Bobisud, Larry E. 8 Can, Nguyen Huu 8 Cheng, Yi 8 Górniewicz, Lech 8 Hung, Nguyen Van 8 Jleli, Mohamed Boussairi 8 Karapınar, Erdal 8 Li, Mengmeng 8 Li, Xiaodi 8 Liu, Yansheng 8 Nourouzi, Kourosh 8 Orpel, Aleksandra 8 Saierli, Olivia 7 Henderson, Johnny Lee 7 Mustafa, Octavian G. 7 Ngoc, Tran Bao 7 Osman, Mahmoud M. 7 Xu, Yuantong 7 Zhang, Keyu 6 Avery, Richard I. 6 Chen, Jinhai 6 Fu, Zhengqing 6 Kyritsi, Sophia Th. 6 Liu, Kui 6 Ma, Ruyun 6 Perán, Juan 6 Pierri, Michelle 6 Sahu, Daya Ram 6 Xia, Yonghui 6 Xu, Xiaojie 6 Yuan, Chengjun 6 Zhang, Xuping 5 Aghajani, Asadollah 5 Au, Vo Van 5 Cui, Yujun 5 Ghadampour, Mostafa 5 Heidarkhani, Shapour 5 Kelevedjiev, Petio S. 5 Kopanov, Peter 5 Krichen, Bilel 5 Li, Lin 5 Li, Xuesong 5 Liu, Rui 5 Luc, Nguyen Hoang 5 Petruşel, Adrian 5 Rahman, Ghaus Ur 5 Sakthivel, Rathinasamy ...and 378 more Co-Authors all top 5 Serials 72 Applicable Analysis 58 Journal of Mathematical Analysis and Applications 48 Dynamic Systems and Applications 47 Applied Mathematics Letters 44 Applied Mathematics and Computation 36 Advances in Difference Equations 32 Nonlinear Analysis. Theory, Methods & Applications. Series A: Theory and Methods 31 Computers & Mathematics with Applications 30 Fixed Point Theory 28 Dynamics of Continuous, Discrete & Impulsive Systems. Series A. Mathematical Analysis 27 Mathematical and Computer Modelling 23 Proceedings of the American Mathematical Society 22 Communications in Applied Analysis 21 Mathematical Methods in the Applied Sciences 21 Nonlinear Analysis. Theory, Methods & Applications 20 Journal of Computational and Applied Mathematics 19 Electronic Journal of Differential Equations (EJDE) 19 Journal of Inequalities and Applications 19 Journal of Nonlinear and Convex Analysis 18 Nonlinear Analysis Forum 18 Fixed Point Theory and Applications 17 Nonlinear Functional Analysis and Applications 16 Nonlinear Analysis. Modelling and Control 15 Topological Methods in Nonlinear Analysis 14 Mathematical Inequalities & Applications 13 Mathematische Nachrichten 13 Zeitschrift für Analysis und ihre Anwendungen 13 Journal of Applied Mathematics and Stochastic Analysis 13 Memoirs on Differential Equations and Mathematical Physics 13 Boundary Value Problems 12 Bulletin of the Australian Mathematical Society 12 Acta Applicandae Mathematicae 12 Aequationes Mathematicae 12 Georgian Mathematical Journal 12 Filomat 12 Communications in Nonlinear Science and Numerical Simulation 12 Journal of Applied Mathematics and Computing 12 Journal of Fixed Point Theory and Applications 11 Rocky Mountain Journal of Mathematics 11 Journal of Differential Equations 11 Positivity 10 Bulletin of the Iranian Mathematical Society 10 Journal of Integral Equations and Applications 10 Nonlinear Analysis. Real World Applications 10 Cubo 10 Differential Equations and Applications 10 Journal of Applied Analysis and Computation 9 Fuzzy Sets and Systems 9 Glasgow Mathematical Journal 9 Journal of Difference Equations and Applications 9 Nonlinear Studies 9 Differential Equations and Dynamical Systems 8 Annales Polonici Mathematici 8 Numerical Functional Analysis and Optimization 8 Proceedings of the Edinburgh Mathematical Society. Series II 8 Rendiconti del Circolo Matemàtico di Palermo. Serie II 8 Analele Științifice ale Universității “Ovidius” Constanța. Seria: Matematică 8 Fractional Calculus & Applied Analysis 8 Journal of Nonlinear Science and Applications 7 Archivum Mathematicum 7 Journal of Optimization Theory and Applications 7 Proceedings of the Royal Irish Academy. Section A, Mathematical and Physical Sciences 7 Abstract and Applied Analysis 7 Electronic Journal of Qualitative Theory of Differential Equations 7 Mathematical Proceedings of the Royal Irish Academy 6 Journal of the Franklin Institute 6 Czechoslovak Mathematical Journal 6 Monatshefte für Mathematik 6 Bulletin of the Korean Mathematical Society 6 Acta Mathematica Hungarica 6 Panamerican Mathematical Journal 6 Functional Differential Equations 6 Acta Mathematica Sinica. English Series 6 Discussiones Mathematicae. Differential Inclusions, Control and Optimization 6 Bulletin of the Malaysian Mathematical Sciences Society. Second Series 5 IMA Journal of Applied Mathematics 5 Chaos, Solitons and Fractals 5 Archiv der Mathematik 5 Mathematica Slovaca 5 Results in Mathematics 5 Utilitas Mathematica 5 Topology and its Applications 5 Annales Societatis Mathematicae Polonae. Seria I. Commentationes Mathematicae 5 Applications of Mathematics 5 Proceedings of the Royal Society of Edinburgh. Section A. Mathematics 5 Series in Mathematical Analysis and Applications 5 Evolution Equations and Control Theory 5 Journal of Function Spaces 4 ZAMP. Zeitschrift für angewandte Mathematik und Physik 4 Demonstratio Mathematica 4 Indian Journal of Mathematics 4 Stochastic Analysis and Applications 4 Bulletin des Sciences Mathématiques 4 Communications on Applied Nonlinear Analysis 4 Mathematical Problems in Engineering 4 Journal of Applied Analysis 4 Taiwanese Journal of Mathematics 4 Neliniĭni Kolyvannya 4 Analysis (München) 4 Qualitative Theory of Dynamical Systems ...and 169 more Serials all top 5 Fields 771 Ordinary differential equations (34-XX) 611 Operator theory (47-XX) 225 General topology (54-XX) 164 Integral equations (45-XX) 159 Partial differential equations (35-XX) 115 Real functions (26-XX) 110 Difference and functional equations (39-XX) 63 Calculus of variations and optimal control; optimization (49-XX) 53 Global analysis, analysis on manifolds (58-XX) 51 Systems theory; control (93-XX) 42 Algebraic topology (55-XX) 40 Functional analysis (46-XX) 40 Biology and other natural sciences (92-XX) 36 Probability theory and stochastic processes (60-XX) 25 Numerical analysis (65-XX) 22 Dynamical systems and ergodic theory (37-XX) 16 Game theory, economics, finance, and other social and behavioral sciences (91-XX) 12 General and overarching topics; collections (00-XX) 12 Mechanics of deformable solids (74-XX) 12 Operations research, mathematical programming (90-XX) 10 Approximations and expansions (41-XX) 9 Abstract harmonic analysis (43-XX) 8 Functions of a complex variable (30-XX) 8 Fluid mechanics (76-XX) 7 Special functions (33-XX) 5 Linear and multilinear algebra; matrix theory (15-XX) 5 Harmonic analysis on Euclidean spaces (42-XX) 3 Sequences, series, summability (40-XX) 3 Computer science (68-XX) 2 Measure and integration (28-XX) 2 Potential theory (31-XX) 2 Integral transforms, operational calculus (44-XX) 2 Convex and discrete geometry (52-XX) 2 Statistics (62-XX) 2 Quantum theory (81-XX) 2 Information and communication theory, circuits (94-XX) 1 Mathematical logic and foundations (03-XX) 1 Algebraic geometry (14-XX) 1 Group theory and generalizations (20-XX) 1 Differential geometry (53-XX) 1 Manifolds and cell complexes (57-XX) Publications by Year all cited Publications top 5 cited Publications Citations contained in zbMATH Open 1,270 Publications have been cited 16,679 times in 10,505 Documents Cited by ▼ Year ▼ Fixed point theory and applications. Zbl 0960.54027 Agarwal, Ravi P.; Meehan, Maria; O’Regan, Donal 344 2001 Fixed point theory for Lipschitzian-type mappings with applications. Zbl 1176.47037 Agarwal, Ravi P.; O’Regan, Donal; Sahu, D. R. 320 2009 Variational approach to impulsive differential equations. Zbl 1167.34318 Nieto, Juan J.; O’Regan, Donal 319 2009 Dynamic equations on time scales: A survey. Zbl 1020.39008 Agarwal, Ravi; Bohner, Martin; O’Regan, Donal; Peterson, Allan 302 2002 Iterative construction of fixed points of nearly asymptotically nonexpansive mappings. Zbl 1134.47047 Agarwal, R. P.; O’Regan, Donal; Sahu, D. R. 300 2007 On a new class of abstract impulsive differential equations. Zbl 1266.34101 Hernández, Eduardo; O’Regan, Donal 297 2013 Generalized contractions in partially ordered metric spaces. Zbl 1140.47042 Agarwal, Ravi P.; El-Gebeily, M. A.; O’Regan, Donal 283 2008 Oscillation theory for difference and functional differential equations. Zbl 0954.34002 Agarwal, Ravi P.; Grace, Said R.; O’Regan, Donal 201 2000 Fixed point theorems for generalized contractions in ordered metric spaces. Zbl 1142.47033 O’Regan, Donal; Petruşel, Adrian 197 2008 Oscillation theory for second order linear, half-linear, superlinear and sublinear dynamic equations. Zbl 1073.34002 Agarwal, Ravi P.; Grace, Said R.; O’Regan, Donal 182 2002 Positive solutions for Dirichlet problems of singular nonlinear fractional differential equations. Zbl 1206.34009 Agarwal, Ravi P.; O’Regan, Donal; Staněk, Svatoslav 178 2010 Positive solutions of differential, difference and integral equations. Zbl 1157.34301 Agarwal, Ravi P.; O’Regan, Donal; Wong, Patricia J. Y. 173 1999 Infinite interval problems for differential, difference and integral equations. Zbl 0988.34002 Agarwal, Ravi P.; O’Regan, Donal 156 2001 Discrete oscillation theory. Zbl 1084.39001 Agarwal, Ravi P.; Bohner, Martin; Grace, Said R.; O’Regan, Donal 151 2005 Existence of solutions for semi-linear abstract differential equations with not instantaneous impulses. Zbl 1293.34019 Pierri, Michelle; O’Regan, Donal; Rolnik, Vanessa 144 2013 On recent developments in the theory of abstract differential equations with fractional derivatives. Zbl 1229.34004 Hernández, Eduardo; O’Regan, Donal; Balachandran, Krishnan 141 2010 Multiple positive solutions of singular and nonsingular discrete problems via variational methods. Zbl 1070.39005 Agarwal, Ravi P.; Perera, Kanishka; O’Regan, Donal 138 2004 Multiple positive solutions of singular discrete \(p\)-Laplacian problems via variational methods. Zbl 1098.39001 Agarwal, Ravi P.; Perera, Kanishka; O’Regan, Donal 121 2005 Existence theory for nonlinear ordinary differential equations. Zbl 1077.34505 O’Regan, Donal 111 1997 Positive solutions to certain classes of singular nonlinear second order boundary value problems. Zbl 0808.34022 O’Regan, D. 109 1994 Topological degree theory and applications. Zbl 1095.47001 O’Regan, Donal; Cho, Yeol Je; Chen, Yu-Qing 104 2006 Morse theoretic aspects of \(p\)-Laplacian type operators. Zbl 1192.58007 Perera, Kanishka; Agarwal, Ravi P.; O’Regan, Donal 104 2010 The extinction and persistence of the stochastic SIS epidemic model with vaccination. Zbl 1395.92180 Zhao, Yanan; Jiang, Daqing; O’Regan, Donal 92 2013 Nonlinear boundary value problems on time scales. Zbl 0995.34016 Agarwal, Ravi P.; O’Regan, Donal 88 2001 Some general existence principles and results for \((\varphi(y'))=qf(t,y,y'),0<t<1\). Zbl 0778.34013 O’Regan, Donal 85 1993 Multiple nonnegative solutions for second order impulsive differential equations. Zbl 1047.34008 Agarwal, Ravi P.; O’Regan, Donal 84 2000 Oscillation criteria for second-order nonlinear neutral delay dynamic equations. Zbl 1062.34068 Agarwal, Ravi P.; O’Regan, Donal; Saker, S. H. 81 2004 Analysis of autonomous Lotka-Volterra competition systems with random perturbation. Zbl 1258.34099 Jiang, Daqing; Ji, Chunyan; Li, Xiaoyue; O’Regan, Donal 81 2012 Eigenvalues and the one-dimensional \(p\)-Laplacian. Zbl 1002.34019 Agarwal, Ravi P.; Lü, Haishen; O’Regan, Donal 79 2002 Fixed point theory in metric type spaces. Zbl 1347.54001 Agarwal, Ravi P.; Karapınar, Erdal; O’Regan, Donal; Roldán-López-de-Hierro, Antonio Francisco 79 2015 Solvability of some fourth (and higher) order singular boundary value problems. Zbl 0795.34018 O’Regan, Donal 78 1991 Nonlinear superlinear singular and nonsingular second order boundary value problems. Zbl 0902.34015 Agarwal, Ravi P.; O’Regan, Donal 78 1998 Anti-periodic solutions for fully nonlinear first-order differential equations. Zbl 1142.34313 Chen, Yuqing; Nieto, Juan J.; O’Regan, Donal 76 2007 Oscillation criteria for certain \(n\)th order differential equations with deviating arguments. Zbl 0997.34060 Agarwal, Ravi P.; Grace, Said R.; O’Regan, Donal 70 2001 A survey of Lyapunov functions, stability and impulsive Caputo fractional differential equations. Zbl 1343.34006 Agarwal, Ravi; Hristova, Snezhana; O’Regan, Donal 68 2016 Fixed-point theory for the sum of two operators. Zbl 0858.34049 O’Regan, D. 67 1996 Dynamic inequalities on time scales. Zbl 1318.26002 Agarwal, Ravi; O’Regan, Donal; Saker, Samir 67 2014 Singular boundary value problems for first and second order impulsive differential equations. Zbl 1073.34025 Agarwal, Ravi P.; Franco, Daniel; O’Regan, Donal 66 2005 Singular boundary value problems for superlinear second order ordinary and delay differential equations. Zbl 0863.34022 Agarwal, Ravi P.; O’Regan, Donal 66 1996 Conditions for persistence and ergodicity of a stochastic Lotka-Volterra predator-prey model with regime switching. Zbl 1510.92195 Zu, Li; Jiang, Daqing; O’Regan, Donal 65 2015 Existence principles for nonlinear resonant operator and integral equations. Zbl 0932.45010 Meehan, M.; O’Regan, D. 64 1998 Oscillation of second-order strongly superlinear and strongly sublinear dynamic equations. Zbl 1221.34083 Grace, Said R.; Agarwal, Ravi P.; Bohner, Martin; O’Regan, Donal 64 2009 Nonlinear Urysohn discrete equations on the infinite interval: a fixed-point approach. Zbl 1003.39017 Agarwal, R. P.; O’Regan, D. 63 2001 Positive solutions for mixed problems of singular fractional differential equations. Zbl 1232.26005 Agarwal, Ravi P.; O’Regan, Donal; Staněk, Svatoslav 63 2012 Oscillation theory for second order dynamic equations. Zbl 1043.34032 Agarwal, Ravi P.; Grace, Said R.; O’Regan, Donal 63 2003 Differential mixed variational inequalities in finite dimensional spaces. Zbl 1186.49006 Li, Xue-Song; Huang, Nan-Jing; O’Regan, Donal 58 2010 Fuzzy fractional integral equations under compactness type condition. Zbl 1312.45009 Agarwal, Ravi; Arshad, Sadia; O’Regan, Donal; Lupulescu, Vasile 57 2012 Existence theory for single and multiple solutions to singular positone boundary value problems. Zbl 0999.34018 Agarwal, Ravi P.; O’Regan, Donal 55 2001 Existence theory for nonlinear integral and integrodifferential equations. Zbl 0905.45003 O’Regan, Donal; Meehan, Maria 55 1998 Lyapunov-type inequalities for a class of fractional differential equations. Zbl 1338.34023 O’Regan, Donal; Samet, Bessem 55 2015 Fractional boundary value problems with singularities in space variables. Zbl 1268.34023 O’Regan, Donal; Staněk, Svatoslav 55 2013 Non-instantaneous impulses in differential equations. Zbl 1426.34001 Agarwal, Ravi; Hristova, Snezhana; O’Regan, Donal 54 2017 Global exponential stabilization of impulsive neural networks with unbounded continuously distributed delays. Zbl 1316.34079 Li, Xiaodi; O’Regan, Donal; Akca, Haydar 52 2015 Solvability of some nonlinear boundary value problems. Zbl 0653.34015 Bobisud, L. E.; O’Regan, D.; Royalty, W. D. 52 1988 Fixed-point theory for weakly sequentially continuous mappings. Zbl 1185.34026 O’Regan, D. 52 1998 Stability of Caputo fractional differential equations by Lyapunov functions. Zbl 1374.34005 Agarwal, Ravi; O’Regan, Donal; Hristova, Snezhana 51 2015 Hardy type inequalities on time scales. Zbl 1359.26002 Agarwal, Ravi P.; O’Regan, Donal; Saker, Samir H. 51 2016 Multiplicity results for singular conjugate, focal, and \((N,P)\) problems. Zbl 0978.34018 Agarwal, Ravi P.; O’Regan, Donal 51 2001 Theorems of Leray-Schauder type and applications. Zbl 1045.47002 O’Regan, Donal; Precup, Radu 50 2001 The oscillation of certain higher-order functional differential equations. Zbl 1070.34083 Agarwal, R. P.; Grace, S. R.; O’Regan, D. 49 2003 On existence and local attractivity of solutions of a quadratic Volterra integral equation of fractional order. Zbl 1147.45003 Banaś, Józef; O’Regan, Donal 49 2008 On abstract differential equations with non-instantaneous impulses. Zbl 1360.34131 Hernández, Eduardo; Pierri, Michelle; O’Regan, Donal 49 2015 Boundary value problems for discrete equations. Zbl 0890.39001 Agarwal, R. P.; O’Regan, D. 48 1997 Fixed point theorems for singlevalued and multivalued generalized contractions in metric spaces endowed with a graph. Zbl 1227.54053 Nicolae, Adriana; O’Regan, Donal; Petruşel, Adrian 48 2011 Periodic solution for a non-autonomous Lotka-Volterra predator-prey model with random perturbation. Zbl 1326.34091 Zu, Li; Jiang, Daqing; O’Regan, Donal; Ge, Bin 47 2015 Singular differential and integral equations with applications. Zbl 1055.34001 Agarwal, Ravi P.; O’Regan, Donal 46 2003 A multiplicity result for second order impulsive differential equations via the Leggett Williams fixed point theorem. Zbl 1070.34042 Agarwal, Ravi P.; O’Regan, Donal 46 2005 A fixed-point approach for nonlinear discrete boundary value problems. Zbl 0933.39004 Agarwal, R. P.; O’Regan, D. 46 1998 Initial and boundary value problems for fuzzy differential equations. Zbl 1048.34015 O’Regan, Donal; Lakshmikantham, V.; Nieto, Juan J. 44 2003 Multiple positive solutions to superlinear periodic boundary value problems with repulsive singular forces. Zbl 1042.34047 Jiang, Daqing; Chu, Jifeng; O’Regan, Donal; Agarwal, Ravi P. 43 2003 Ulam-Hyers-Mittag-Leffler stability for \(\psi\)-Hilfer fractional-order delay differential equations. Zbl 1458.34128 Liu, Kui; Wang, JinRong; O’Regan, Donal 43 2019 Twin solutions to singular Dirichlet problems. Zbl 0946.34022 Agarwal, Ravi P.; O’Regan, Donal 42 1999 Nonlinear contraction theorems in probabilistic spaces. Zbl 1135.54315 O’Regan, Donal; Saadati, Reza 42 2008 A note on initial value problems for fractional fuzzy differential equations. Zbl 1397.34013 Ngo, Hoa Van; Lupulescu, Vasile; O’Regan, Donal 42 2018 Impulsive differential equations with variable times. Zbl 0863.34015 Frigon, Marlène; O’Regan, Donal 41 1996 Theory of singular boundary value problems. Zbl 0807.34028 O’Regan, Donal 41 1994 Controllability of Volterra-Fredholm type systems in Banach spaces. Zbl 1160.93005 Hernández M., Eduardo; O’Regan, Donal 41 2009 An introduction to ordinary differential equations. Zbl 1158.34001 Agarwal, Ravi P.; O’Regan, Donal 41 2008 Stochastically asymptotically stability of the multi-group SEIR and SIR models with random perturbation. Zbl 1243.92047 Yuan, Chengjun; Jiang, Daqing; O’Regan, Donal; Agarwal, Ravi P. 40 2012 Fixed point theorems for set-valued maps and existence principles for integral inclusions. Zbl 0956.47026 O’Regan, Donal; Precup, Radu 40 2000 Existence of solutions for first order ordinary differential equations with nonlinear boundary conditions. Zbl 1058.34015 Franco, Daniel; Nieto, Juan J.; O’Regan, Donal 40 2004 Multiple positive solutions to systems of nonlinear semipositone fractional differential equations with coupled boundary conditions. Zbl 1340.34041 Yuan, Chengjun; Jiang, Daqing; O’Regan, D.; Agarwal, Ravi 40 2012 Unbounded solutions for singular boundary value problems on the semi-infinite interval: upper and lower solutions and multiplicity. Zbl 1116.34016 Yan, Baoqiang; O’Regan, Donal; Agarwal, Ravi P. 39 2006 Fourth-order problems with nonlinear boundary conditions. Zbl 1068.34013 Franco, Daniel; O’Regan, Donal; Perán, Juan 38 2005 Anti-periodic boundary value problem for nonlinear first order ordinary differential equations. Zbl 1097.34015 Franco, Daniel; Nieto, Juan J.; O’Regan, Donal 38 2003 Singular Dirichlet boundary value problems. I: Superlinear and nonresonant case. Zbl 0884.34028 O’Regan, Donal 38 1997 Strong convergence theorems for relatively nonexpansive mappings in Banach spaces with applications. Zbl 1201.65091 Li, Xi; Huang, Nan-Jing; O’Regan, Donal 38 2010 First order impulsive initial and periodic problems with variable moments. Zbl 0930.34016 Frigon, M.; O’Regan, D. 38 1999 Existence results for nonlinear integral equations. Zbl 0851.45003 O’Regan, Donal 37 1995 Positive solutions for a system of nonlinear Hadamard fractional differential equations involving coupled integral boundary conditions. Zbl 1499.34182 Jiang, Jiqiang; O’Regan, Donal; Xu, Jiafa; Fu, Zhengqing 37 2019 New oscillation criteria for second-order neutral functional dynamic equations via the generalized Riccati substitution. Zbl 1221.34245 Saker, S. H.; O’Regan, Donal 37 2011 Generalized Hardy, Copson, Leindler and Bennett inequalities on time scales. Zbl 1309.26018 Saker, S. H.; O’Regan, D.; Agarwal, R. 37 2014 Integral inclusions of upper semi-continuous or lower semi-continuous type. Zbl 0860.45007 O’Regan, Donal 36 1996 Positive solutions for \((p,n-p)\) conjugate boundary value problems. Zbl 0920.34027 Agarwal, Ravi P.; O’Regan, Donal 36 1998 Extremal solutions for nonlinear fractional boundary value problems with \(p\)-Laplacian. Zbl 1323.34004 Ding, Youzheng; Wei, Zhongli; Xu, Jiafa; O’Regan, Donal 36 2015 \(p\)th moment exponential stability of impulsive stochastic functional differential equations and application to control problems of NNs. Zbl 1395.93566 Li, Xiaodi; Zhu, Quanxin; O’Regan, Donal 36 2014 Stability by Lyapunov like functions of nonlinear differential equations with non-instantaneous impulses. Zbl 1361.34064 Agarwal, Ravi; O’Regan, D.; Hristova, S. 36 2017 Weak solutions of ordinary differential equations in Banach spaces. Zbl 0933.34068 O’Regan, D. 35 1999 Boundary value problems on infinite intervals and semiconductor devices. Zbl 0594.34019 Granas, A.; Guenther, R. B.; Lee, J. W.; O’Regan, D. 35 1986 A note on existence of nonnegative solutions to singular semi-positone problems. Zbl 0921.34027 Agarwal, Ravi P.; O’Regan, Donal 35 1999 Fixed point theory in RWC-Banach algebras. Zbl 07977995 Banaś, Józef; Krichen, Bilel; Mefteh, Bilel; O’Regan, Donal 1 2025 Existence of equilibria for \(N\)-person games. Zbl 07920596 O’Regan, Donal 1 2024 Nontrivial solutions for a first-order impulsive integral boundary value problem on time scales. Zbl 1535.34067 Li, Yanfang; O’Regan, Donal; Xu, Jiafa 1 2024 Existence of solutions for a fractional Riemann-Stieltjes integral boundary value problem. Zbl 07843108 Li, Yanfang; O’Regan, Donal; Xu, Jiafa 1 2024 New results on continuity by order of derivative for conformable parabolic equations. Zbl 1521.35193 Tuan, Nguyen Huy; Nguyen, Van Tien; O’Regan, Donal; Can, Nguyen Huu; Nguyen, Van Thinh 5 2023 Collectively coincidence-type results and applications. Zbl 1514.47084 O’Regan, Donal 3 2023 Maximal elements and equilibria for generalized majorized maps. Zbl 1538.54117 O’Regan, Donal 3 2023 A note on collectively fixed and coincidence points. Zbl 07884505 O’regan, Donal 3 2023 Fixed point theorems in generalized Banach spaces under G-weak topology features. Zbl 1519.47055 Boudaoui, Ahmed; Krichen, Bilel; Laksaci, Noura; O’Regan, Donal 2 2023 Mixed vector equilibrium-like problems on Hadamard manifolds: error bound analysis. Zbl 1518.47095 Nguyen Van Hung; Vo Minh Tam; O’Regan, Donal 2 2023 Solvability for a Hadamard-type fractional integral boundary value problem. Zbl 1534.34014 Xu, Jiafa; Liu, Jie; O’Regan, Donal 2 2023 Optimal product release time for a new high-tech startup firm under technical uncertainty. Zbl 1513.91028 Wang, Ming-Hui; Huang, Nan-Jing; O’Regan, Donal 1 2023 A note on noncompact collectively coincidence point theory. Zbl 07773831 O’Regan, Donal 1 2023 The study of equilibria for generalized games in Hausdorff topological vector spaces. Zbl 07920415 O’Regan, Donal 1 2023 Strong convergence theorem obtained by a generalized projections method for solving an equilibrium problem and fixed point problems. Zbl 1542.47090 Ghadampour, Mostafa; Soori, Ebrahim; Agarwal, Ravi P.; O’Regan, Donal 1 2023 Best approximations of stochastic bi-homomorphisms and bi-derivations in MC-\(\diamond\)-algebras. Zbl 1515.39015 Tuan, Nguyen Huy; Saadati, Reza; O’Regan, Donal; Park, Choonkil 1 2023 Stability of non-instantaneous impulsive systems in Hilbert spaces. Zbl 1539.34055 Li, Mengmeng; Wang, JinRong; O’Regan, Donal 1 2023 Existence of solutions for a nonlocal boundary value problem at resonance on the half-line. Zbl 1518.34028 Djafri, S.; Moussaoui, T.; O’Regan, D. 1 2023 Continuous selecting families and collectively fixed point theory. Zbl 1533.47045 O’Regan, Donal 1 2023 Nontrivial solutions for an asymptotically linear \(\Delta_\alpha\)-Laplace equation. Zbl 1529.35246 Xu, Jiafa; Chen, Jia; O’Regan, Donal 1 2023 Monotone iterative positive solutions for a fractional differential system with coupled Hadamard type fractional integral conditions. Zbl 07920386 Li, Yaohong; Bai, Shikun; O’Regan, Donal 1 2023 A fractional Landweber iteration method for simultaneous inversion in a time-fractional diffusion equation. Zbl 07921266 Wen, Jin; Yue, Chong-Wang; Liu, Zhuan-Xia; O’Regan, Donal 1 2023 The Nehari manifold for a \(\psi \)-Hilfer fractional \(p\)-Laplacian. Zbl 1507.35331 Vanterler da Costa Sousa, José; Zuo, Jiabin; O’Regan, Donal 31 2022 On time fractional pseudo-parabolic equations with nonlocal integral conditions. Zbl 1497.35503 Tuan, Nguyen Anh; O’Regan, Donal; Baleanu, Dumitru; Tuan, Nguyen H. 9 2022 Ground state solution for the nonlinear Klein-Gordon equation coupled with Born-Infeld theory with critical exponents. Zbl 1485.35177 He, Chuan-Min; Li, Lin; Chen, Shang-Jie; O’Regan, Donal 6 2022 Almost periodic fuzzy multidimensional dynamic systems and applications on time scales. Zbl 1506.34010 Wang, Chao; Agarwal, Ravi P.; O’Regan, Donal 6 2022 Collectively fixed point theory in the compact and coercive cases. Zbl 1516.54044 O’Regan, Donal 6 2022 Second-order differential equations for the power converters dynamical performance analysis. Zbl 1527.34044 Amoroso, Eleonora; Bonanno, Gabriele; D’Aguí, Giuseppina; De Caro, Salvatore; Foti, Salvatore; O’Regan, Donal; Testa, Antonio 5 2022 Convergence analysis for iterative learning control of conformable impulsive differential equations. Zbl 1483.34025 Qiu, Wanzheng; Fečkan, Michal; O’Regan, Donal; Wang, JinRong 5 2022 \((\omega,c)\)-periodic solutions for time-varying non-instantaneous impulsive differential systems. Zbl 1509.34019 Liu, Kui; Fečkan, Michal; O’Regan, Donal; Wang, JinRong 5 2022 Lyapunov functions and stability of Caputo fractional differential equations with delays. Zbl 1503.34138 Agarwal, Ravi; Hristova, Snezhana; O’Regan, Donal 5 2022 Stability analysis of second order impulsive differential equations. Zbl 1501.34052 Wen, Qian; Wang, JinRong; O’Regan, Donal 5 2022 Relative controllability of impulsive multi-delay differential systems. Zbl 1494.34170 You, Zhongli; Fečkan, Michal; Wang, JinRong; O’Regan, Donal 4 2022 On inverse initial value problems for the stochastic strongly damped wave equation. Zbl 1492.60194 Ngoc, Tran Bao; Thach, Tran Ngoc; O’Regan, Donal; Nguyen Huy Tuan 4 2022 A strong convergence theorem for solving an equilibrium problem and a fixed point problem using the Bregman distance. Zbl 1546.47090 Ghadampour, Mostafa; Soori, Ebrahim; Agarwal, Ravi P.; O’Regan, Donal 3 2022 Terminal value problem for nonlinear parabolic equation with Gaussian white noise. Zbl 1486.35269 Mai, Vinh Quang; Nane, Erkan; O’Regan, Donal; Tuan, Nguyen Huy 3 2022 Existence and stability of solutions to neutral conformable stochastic functional differential equations. Zbl 1483.34113 Xiao, Guanli; Wang, JinRong; O’Regan, D. 3 2022 Exponential stability of axially moving Kirchhoff-beam systems with nonlinear boundary damping and disturbance. Zbl 1500.45006 Cheng, Yi; Dong, Zhihui; O’Regan, Donal 3 2022 \(\lozenge_\alpha \)-measurability and combined measure theory on time scales. Zbl 1502.26029 Wang, Chao; Qin, Guangzhou; Agarwal, Ravi P.; O’Regan, Donal 3 2022 Identification of the right-hand side in a bi-parabolic equation with final data. Zbl 1487.35452 Nam, Danh Hua Quoc; Long, Le Dinh; O’Regan, Donal; Ngoc, Tran Bao; Tuan, Nguyen Huy 3 2022 Stability analysis for conformable non-instantaneous impulsive differential equations. Zbl 1493.34047 Ding, Yuanlin; O’Regan, Donal; Wang, JinRong 3 2022 Integral representations of scalar delay non-instantaneous impulsive Riemann-Liouville fractional differential equations. Zbl 1507.34074 Agarwal, Ravi; Hristova, S.; O’Regan, D. 2 2022 Equilibria for abstract economies in Hausdorff topological vector spaces. Zbl 1497.91171 O’Regan, Donal 2 2022 On the inverse problem for nonlinear strongly damped wave equations with discrete random noise. Zbl 07565155 Triet, Nguyen Anh; Tuan, Nguyen Huy; Phuong, Nguyen Duc; O’ Regan, Donal 2 2022 On the well-posedness and blow-up for a semilinear biparabolic equation. Zbl 1482.35046 Au, Vo Van; Zhou, Yong; O’Regan, Donal 2 2022 Ulam type stability for first-order linear and nonlinear impulsive fuzzy differential equations. Zbl 1499.34013 Liu, Rui; Fečkan, Michal; Wang, JinRong; O’Regan, Donal 2 2022 On a nonlinear parabolic equation with fractional Laplacian and integral conditions. Zbl 1498.35594 Tuan, Nguyen Huy; Tri, Vo Viet; O’Regan, Donal 1 2022 A note on the topological transversality theorem for maps with lower semicontinuous type selections. Zbl 1500.47072 O’Regan, Donal 1 2022 The split common null point problem for generalized resolvents and nonexpansive mappings in Banach spaces. Zbl 1487.47085 Orouji, Bijan; Agarwal, Ravi P.; Soori, Ebrahim; O’Regan, Donal 1 2022 A new class of fractional impulsive differential hemivariational inequalities with an application. Zbl 1490.49010 Weng, Yun-hua; Chen, Tao; Huang, Nan-jing; O’Regan, Donal 1 2022 \((\omega, c)\)-periodic solutions for non-instantaneous impulsive systems with unbounded time-varying coefficients. Zbl 1493.34048 Liu, Kui; Fečkan, Michal; O’Regan, Donal; Wang, Jinrong 1 2022 Coincidence and maximal type results for set valued maps. Zbl 07640271 O’Regan, Donal 1 2022 Nontrivial radial solutions for a system of second order elliptic equations. Zbl 07919238 Zhang, Haiyan; Xu, Jiafa; O’Regan, Donal 1 2022 Commutativity of quaternion-matrix-valued functions and quaternion matrix dynamic equations on time scales. Zbl 1472.34164 Li, Zhien; Wang, Chao; Agarwal, Ravi P.; O’Regan, Donal 21 2021 Controllability of stochastic nonlinear oscillating delay systems driven by the Rosenblatt distribution. Zbl 1462.34104 Sathiyaraj, T.; Wang, JinRong; O’Regan, D. 14 2021 Regularization of a multidimensional diffusion equation with conformable time derivative and discrete data. Zbl 1470.35415 Tuan, Nguyen Huy; Thach, Tran Ngoc; Can, Nguyen Huu; O’Regan, Donal 12 2021 A new derivative concept for set-valued and fuzzy-valued functions. Differential and integral calculus in quasilinear metric spaces. Zbl 1464.26030 Lupulescu, Vasile; O’Regan, Donal 10 2021 Dynamic analysis of a stochastic toxin-mediated predator-prey model in aquatic environments. Zbl 1470.92271 Zu, Li; Jiang, Daqing; O’Regan, Donal; Hayat, Tasawar 9 2021 Fractional Landweber method for an initial inverse problem for time-fractional wave equations. Zbl 1460.35375 Huynh, Le Nhat; Zhou, Yong; O’Regan, Donal; Tuan, Nguyen Huy 8 2021 Some basic properties and fundamental relations for discrete Muckenhoupt and Gehring classes. Zbl 1485.40007 Saker, S. H.; Rabie, S. S.; Alzabut, Jehad; O’Regan, D.; Agarwal, R. P. 8 2021 Relative controllability of a stochastic system using fractional delayed sine and cosine matrices. Zbl 1485.93081 Wang, JinRong; Sathiyaraj, T.; O’Regan, Donal 7 2021 Relative controllability of delay multi-agent systems. Zbl 1525.93024 Si, Yuanchao; Fečkan, Michal; Wang, JinRong; O’Regan, Donal 7 2021 On the initial value problem for the nonlinear fractional Rayleigh-Stokes equation. Zbl 1477.35174 Luc, Nguyen Hoang; Lan, Do; O’Regan, Donal; Tuan, Nguyen Anh; Zhou, Yong 6 2021 New characterizations of weights on dynamic inequalities involving a Hardy operator. Zbl 1504.26064 Saker, S. H.; Alzabut, J.; Saied, A. I.; O’Regan, D. 5 2021 Ulam type stability for non-instantaneous impulsive Caputo fractional differential equations with finite state dependent delay. Zbl 1476.34158 Agarwal, Ravi; Hristova, Snezhana; O’Regan, Donal 5 2021 Self-improving properties of discrete Muckenhoupt weights. Zbl 1512.40003 Saker, Samir H.; O’Regan, Donal; Agarwal, Ravi P. 5 2021 Non-instantaneous impulsive fractional differential equations with state dependent delay and practical stability. Zbl 1513.34294 Agarwal, Ravi; Almeida, Ricardo; Hristova, Snezhana; O’Regan, Donal 5 2021 Existence and uniqueness results for modeling jet flow of the antarctic circumpolar current. Zbl 1460.76912 Wang, JinRong; Fečkan, Michal; Wen, Qian; O’Regan, Donal 5 2021 Continuation theorems for Mönch countable compactness-type set-valued maps. Zbl 1462.54019 O’Regan, Donal 4 2021 Trajectory approximately controllability and optimal control for noninstantaneous impulsive inclusions without compactness. Zbl 1497.34091 Liu, Shengda; Wang, Jinrong; O’Regan, Donal 3 2021 Weighted pseudo \(\delta\)-almost automorphic functions and abstract dynamic equations. Zbl 1470.26051 Wang, Chao; Agarwal, Ravi P.; O’Regan, Donal 3 2021 On a final value problem for a class of nonlinear hyperbolic equations with damping term. Zbl 1480.35404 Can, Nguyen Huu; Tuan, Nguyen Huy; O’Regan, Donal; Au, Vo Van 3 2021 A generalized strong convergence algorithm in the presence of errors for variational inequality problems in Hilbert spaces. Zbl 1489.47091 Ghadampour, Mostafa; O’Regan, Donal; Soori, Ebrahim; Agarwal, Ravi P. 3 2021 Characterizations of reverse dynamic weighted Hardy-type inequalities with kernels on time scales. Zbl 1458.26067 Saker, S. H.; Osman, M. M.; O’Regan, D.; Agarwal, R. P. 3 2021 Hardy-type operators with general kernels and characterizations of dynamic weighted inequalities. Zbl 1473.26032 Saker, S. H.; Osman, M. M.; O’Regan, D.; Agarwal, R. P. 3 2021 Existence conditions for solutions of bilevel vector equilibrium problems with application to traffic network problems with equilibrium constraints. Zbl 1481.47076 Nguyen Van Hung; Tri, Vo Viet; O’Regan, Donal 3 2021 Infinite number of solutions for some elliptic eigenvalue problems of Kirchhoff-type with non-homogeneous material. Zbl 1489.35121 Yan, Baoqiang; O’Regan, Donal; Agarwal, Ravi P. 2 2021 Nonlocal fractional semilinear differential inclusions with noninstantaneous impulses and of order \(\alpha \in (1, 2)\). Zbl 07412527 Wang, JinRong; Ibrahim, Ahmed G.; O’Regan, Donal; Elmandouh, Adel A. 2 2021 Mittag-Leffler stability for impulsive Caputo fractional differential equations. Zbl 1483.34010 Agarwal, R.; Hristova, S.; O’Regan, D. 2 2021 Continuous dependence of fuzzy mild solutions on parameters for IVP of fractional fuzzy evolution equations. Zbl 1498.34007 Zhang, Xuping; Chen, Pengyu; O’Regan, Donal 2 2021 Unique solvability of fractional quadratic nonlinear integral equations. Zbl 1488.45016 Darwish, Mohamed Abdalla; Metwali, Mohamed M. A.; O’Regan, Donal 2 2021 On the initial value problem for fractional Volterra integrodifferential equations with a Caputo-Fabrizio derivative. Zbl 1469.35234 Tuan, Nguyen Huy; Tuan, Nguyen Anh; O’Regan, Donal; Tri, Vo Viet 2 2021 Best approximation of \(\kappa \)-random operator inequalities in matrix MB-algebras. Zbl 1510.47055 Madadi, Masoumeh; O’Regan, Donal; Rassias, Themistocles M.; Saadati, Reza 1 2021 Weak KKM set-valued mappings in hyperconvex metric spaces. Zbl 1499.54147 Agarwal, Ravi P.; Balaj, Mircea; O’Regan, Donal 1 2021 Self-improving properties of weighted Gehring classes with applications to partial differential equations. Zbl 1494.35008 Saker, S. H.; Alzabut, J.; O’Regan, D.; Agarwal, R. P. 1 2021 Maps with weakly sequentially closed graphs satisfying compactness conditions on countable sets. Zbl 1479.47053 O’Regan, Donal 1 2021 Essential weakly Mönch type maps and continuation theory. Zbl 1516.54043 O’Regan, Donal 1 2021 A strong convergence theorem for a finite family of Bregman demimetric mappings in a Banach space under a new shrinking projection method. Zbl 07420409 Orouji, Bijan; Soori, Ebrahim; O’Regan, Donal; Agarwal, Ravi P. 1 2021 Some new Opial type dynamic inequalities via convex functions and applications. Zbl 1494.26055 Saker, S. H.; Alzabut, J.; Sayed, A. G.; O’Regan, D. 1 2021 Generalized Leray-Schauder nonlinear alternatives for general classes of maps. Zbl 1470.54094 O’Regan, Donal 1 2021 Self-improving properties of a generalized Muckenhoupt class. Zbl 1499.42088 Agarwal, R. P.; O’Regan, D.; Saker, S. H. 1 2021 Final value problem for nonlinear time fractional reaction-diffusion equation with discrete data. Zbl 1436.35327 Tuan, Nguyen Huy; Baleanu, Dumitru; Thach, Tran Ngoc; O’Regan, Donal; Can, Nguyen Huu 31 2020 Hyers-Ulam stability and existence of solutions for fractional differential equations with Mittag-Leffler kernel. Zbl 1434.34014 Liu, Kui; Wang, JinRong; Zhou, Yong; O’Regan, Donal 28 2020 Theory of translation closedness for time scales. With applications in translation functions and dynamic equations. Zbl 1435.34004 Wang, Chao; Agarwal, Ravi P.; O’Regan, Donal; Sakthivel, Rathinasamy 26 2020 Hyers-Ulam stability for equations with differences and differential equations with time-dependent and periodic coefficients. Zbl 1469.39009 Buşe, Constantin; Lupulescu, Vasile; O’Regan, Donal 25 2020 Regularized gap functions and error bounds for generalized mixed weak vector quasivariational inequality problems in fuzzy environments. Zbl 1464.49006 Hung, Nguyen Van; Tam, Vo Minh; Nguyen, Tuan; O’Regan, Donal 22 2020 On well-posedness of the sub-diffusion equation with conformable derivative model. Zbl 1450.35276 Nguyen Huy Tuan; Tran Bao Ngoc; Baleanu, Dumitru; O’Regan, Donal 20 2020 Convergence analysis of solution sets for fuzzy optimization problems. Zbl 1498.47151 Nguyen Van Hung; Vo Minh Tam; Nguyen Huy Tuan; O’Regan, Donal 18 2020 A new class of generalized multiobjective games in bounded rationality with fuzzy mappings: structural \((\lambda, \varepsilon)\)-stability and \((\lambda, \varepsilon)\)-robustness to \(\varepsilon\)-equilibria. Zbl 1458.91054 Hung, Nguyen Van; Tam, Vo Minh; O’Regan, Donal; Cho, Yeol Je 17 2020 Positive solutions for a system of Hadamard-type fractional differential equations with semipositone nonlinearities. Zbl 1432.34010 Ding, Youzheng; Jiang, Jiqiang; O’Regan, Donal; Xu, Jiafa 16 2020 ...and 1170 more Documents all cited Publications top 5 cited Publications all top 5 Cited by 8,250 Authors 684 O’Regan, Donal 495 Agarwal, Ravi P. 167 Wang, Jinrong 142 Jiang, Daqing 129 Ahmad, Bashir 101 Nieto Roig, Juan Jose 97 Benchohra, Mouffak 96 Al-saedi, Ahmed Eid Salem 96 Ge, Weigao 93 Ntouyas, Sotiris K. 91 Graef, John R. 89 Grace, Said Rezk 88 Saker, Samir H. 82 Zhou, Yong 79 Băleanu, Dumitru I. 78 Liu, Lishan 71 Li, Tongxing 68 Wong, Patricia J. 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