Edit Profile O’Regan, Donal Compute Distance To: Compute Author ID: oregan.donal Published as: O’Regan, D.; O’Regan, Daniel J.; O’Regan, Donal; O’Regan, Donald; O’Regan, Dónal; O’regan, D.; O’regan, Donal Homepage: http://www.maths.nuigalway.ie/staff/doregan.shtml External Links: Math-Net.Ru · dblp · GND Documents Indexed: 1,422 Publications since 1986, including 32 Books Reviewing Activity: 38 Reviews all top 5 Co-Authors 241 single-authored 625 Agarwal, Ravi P. 50 Jiang, Daqing 43 Saker, Samir H. 41 Khristova, Snezhana G. 39 Grace, Said Rezk 38 Wang, Jinrong 29 Lu, Haishen 28 Wong, Patricia J. Y. 25 Papageorgiou, Nikolaos S. 24 Yan, Baoqiang 23 Meehan, Maria 22 Staněk, Svatoslav 21 Lakshmikantham, Vangipuram 20 Lupulescu, Vasile 19 El-Gebeily, Mohamed A. 19 Hernández, Eduardo M. 19 Shahzad, Naseer 19 Xu, Jiafa 17 Chen, Yuqing 17 Frigon, Marlène 17 Precup, Radu 14 Balaj, Mircea 14 Guo, Chengjun 14 Huang, Nan-Jing 14 Ntouyas, Sotiris K. 14 Saadati, Reza 14 Wang, Chao 13 Buşe, Constantin 13 Cho, Yeol Je 13 Chu, Jifeng 13 Nguyen Huy Tuan 12 Amini-Harandi, Alireza 12 Franco, Daniel H. T. 12 Xu, Xian 11 Farajzadeh, Ali P. 11 Filippakis, Michael E. 11 Nieto Roig, Juan Jose 11 Perera, Kanishka 11 Zu, Li 10 Samet, Bessem 9 Bohner, Martin J. 9 Bonanno, Gabriele 9 Dshalalow, Jewgeni H. 9 Moussaoui, Toufik 9 Taoudi, Mohamed Aziz 8 Ben Amar, Afif 8 Bobisud, Larry E. 8 Górniewicz, Lech 8 Ibrahim, Ahmed Gamal 8 Jleli, Mohamed 8 Karapınar, Erdal 8 Li, Xiaodi 8 Liu, Yansheng 7 Băleanu, Dumitru I. 7 Banaś, Józef 7 Henderson, Johnny Lee 7 Lee, John Walter 7 Mustafa, Octavian G. 7 Nourouzi, Kourosh 7 Orpel, Aleksandra 7 Saierli, Olivia 7 Xu, Yuantong 7 Zhou, Yong 6 Avery, Richard I. 6 Chen, Jinhai 6 Fečkan, Michal 6 Kyritsi, Sophia Th. 6 Ma, Ruyun 6 Perán, Juan 6 Pierri, Michelle 6 Xu, Xiaojie 6 Yuan, Chengjun 6 Zhang, Keyu 5 Heidarkhani, Shapour 5 Kelevedjiev, Petio S. 5 Li, Mengmeng 5 Osman, Mahmoud M. 5 Petruşel, Adrian 5 Rahman, Ghaus Ur 5 Sahu, Daya Ram 5 Shakhmurov, Veli B. 5 Wang, Fulong 5 Yang, Zhilin 4 Arshad, Sadia 4 Dhage, Bapurao C. 4 Dong, Wei 4 Fu, Zhengqing 4 Hung, Nguyen Van 4 Kim, Jong Kyu 4 Kopanov, Peter 4 Leela, Srinivasa G. 4 Li, Xuesong 4 Royalty, W. D. 4 Sadarangani, Kishin B. 4 Wang, Haiyan 4 Xia, Yonghui 4 Younus, Awais 3 Afrouzi, Ghasem Alizadeh 3 Aghajani, Asadollah 3 Alsulami, Hamed Hamdan ...and 303 more Co-Authors all top 5 Serials 61 Applicable Analysis 55 Journal of Mathematical Analysis and Applications 48 Dynamic Systems and Applications 47 Applied Mathematics Letters 44 Applied Mathematics and Computation 32 Nonlinear Analysis. Theory, Methods & Applications. Series A: Theory and Methods 31 Computers & Mathematics with Applications 27 Mathematical and Computer Modelling 27 Dynamics of Continuous, Discrete & Impulsive Systems. Series A. Mathematical Analysis 25 Advances in Difference Equations 23 Proceedings of the American Mathematical Society 22 Communications in Applied Analysis 22 Fixed Point Theory 21 Nonlinear Analysis. Theory, Methods & Applications 20 Journal of Computational and Applied Mathematics 18 Electronic Journal of Differential Equations (EJDE) 18 Nonlinear Analysis Forum 18 Fixed Point Theory and Applications 17 Nonlinear Functional Analysis and Applications 16 Journal of Nonlinear and Convex Analysis 14 Topological Methods in Nonlinear Analysis 14 Mathematical Inequalities & Applications 13 Zeitschrift für Analysis und ihre Anwendungen 13 Journal of Applied Mathematics and Stochastic Analysis 13 Memoirs on Differential Equations and Mathematical Physics 12 Bulletin of the Australian Mathematical Society 12 Mathematical Methods in the Applied Sciences 12 Acta Applicandae Mathematicae 12 Journal of Applied Mathematics and Computing 11 Journal of Differential Equations 11 Mathematische Nachrichten 11 Journal of Inequalities and Applications 11 Communications in Nonlinear Science and Numerical Simulation 11 Journal of Fixed Point Theory and Applications 10 Rocky Mountain Journal of Mathematics 10 Journal of Integral Equations and Applications 10 Aequationes Mathematicae 10 Georgian Mathematical Journal 10 Positivity 10 Cubo 10 Boundary Value Problems 9 Glasgow Mathematical Journal 9 Journal of Difference Equations and Applications 9 Nonlinear Studies 9 Nonlinear Analysis. Real World Applications 9 Differential Equations and Applications 8 Proceedings of the Edinburgh Mathematical Society. Series II 8 Abstract and Applied Analysis 8 Journal of Nonlinear Science and Applications 7 Annales Polonici Mathematici 7 Archivum Mathematicum 7 Bulletin of the Iranian Mathematical Society 7 Proceedings of the Royal Irish Academy. Section A, Mathematical and Physical Sciences 7 Electronic Journal of Qualitative Theory of Differential Equations 7 Fractional Calculus & Applied Analysis 7 Mathematical Proceedings of the Royal Irish Academy 6 Journal of the Franklin Institute 6 Czechoslovak Mathematical Journal 6 Journal of Optimization Theory and Applications 6 Monatshefte für Mathematik 6 Numerical Functional Analysis and Optimization 6 Rendiconti del Circolo Matemàtico di Palermo. Serie II 6 Bulletin of the Korean Mathematical Society 6 Panamerican Mathematical Journal 6 Functional Differential Equations 6 Acta Mathematica Sinica. English Series 5 Archiv der Mathematik 5 Fuzzy Sets and Systems 5 Mathematica Slovaca 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 Analele Ştiinţifice ale Universităţii “Ovidius” Constanţa. Seria: Matematică 5 Differential Equations and Dynamical Systems 5 Bulletin of the Malaysian Mathematical Sciences Society. Second Series 4 IMA Journal of Applied Mathematics 4 Demonstratio Mathematica 4 Indian Journal of Mathematics 4 Results in Mathematics 4 Stochastic Analysis and Applications 4 Acta Mathematica Hungarica 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 Differential Equations 4 Nonlinear Analysis. Modelling and Control 4 Journal of Applied Mathematics 4 Revista de la Real Academia de Ciencias Exactas, Físicas y Naturales. Serie A: Matemáticas. RACSAM 3 ZAMP. Zeitschrift für angewandte Mathematik und Physik 3 Commentationes Mathematicae Universitatis Carolinae 3 International Journal of Mathematics and Mathematical Sciences 3 Journal of the Korean Mathematical Society 3 Mathematika 3 Proceedings of the Indian Academy of Sciences. Mathematical Sciences 3 Bulletin of the Belgian Mathematical Society - Simon Stevin ...and 145 more Serials all top 5 Fields 709 Ordinary differential equations (34-XX) 543 Operator theory (47-XX) 194 General topology (54-XX) 150 Integral equations (45-XX) 114 Partial differential equations (35-XX) 103 Difference and functional equations (39-XX) 78 Real functions (26-XX) 54 Calculus of variations and optimal control; optimization (49-XX) 53 Global analysis, analysis on manifolds (58-XX) 40 Systems theory; control (93-XX) 39 Algebraic topology (55-XX) 35 Functional analysis (46-XX) 33 Biology and other natural sciences (92-XX) 27 Probability theory and stochastic processes (60-XX) 20 Numerical analysis (65-XX) 17 Dynamical systems and ergodic theory (37-XX) 13 General and overarching topics; collections (00-XX) 9 Operations research, mathematical programming (90-XX) 8 Approximations and expansions (41-XX) 8 Mechanics of deformable solids (74-XX) 8 Game theory, economics, finance, and other social and behavioral sciences (91-XX) 7 Special functions (33-XX) 7 Fluid mechanics (76-XX) 6 Functions of a complex variable (30-XX) 6 Abstract harmonic analysis (43-XX) 3 Computer science (68-XX) 2 Linear and multilinear algebra; matrix theory (15-XX) 2 Measure and integration (28-XX) 2 Potential theory (31-XX) 2 Harmonic analysis on Euclidean spaces (42-XX) 2 Integral transforms, operational calculus (44-XX) 2 Quantum theory (81-XX) 2 Information and communication theory, circuits (94-XX) 1 Mathematical logic and foundations (03-XX) 1 Field theory and polynomials (12-XX) 1 Sequences, series, summability (40-XX) 1 Convex and discrete geometry (52-XX) 1 Differential geometry (53-XX) 1 Statistics (62-XX) Publications by Year all cited Publications top 5 cited Publications Citations contained in zbMATH Open 1,033 Publications have been cited 10,754 times in 6,580 Documents Cited by ▼ Year ▼ Variational approach to impulsive differential equations. Zbl 1167.34318Nieto, Juan J.; O’Regan, Donal 269 2009 Dynamic equations on time scales: A survey. Zbl 1020.39008Agarwal, Ravi; Bohner, Martin; O’Regan, Donal; Peterson, Allan 251 2002 Generalized contractions in partially ordered metric spaces. Zbl 1140.47042Agarwal, Ravi P.; El-Gebeily, M. A.; O’Regan, Donal 233 2008 Positive solutions of differential, difference and integral equations. Zbl 1157.34301Agarwal, Ravi P.; O’Regan, Donal; Wong, Patricia J. Y. 221 1999 Fixed point theorems for generalized contractions in ordered metric spaces. Zbl 1142.47033O’Regan, Donal; Petruşel, Adrian 169 2008 Fixed point theory and applications. Zbl 0960.54027Agarwal, Ravi P.; Meehan, Maria; O’Regan, Donal 143 2001 Iterative construction of fixed points of nearly asymptotically nonexpansive mappings. Zbl 1134.47047Agarwal, R. P.; O’Regan, Donal; Sahu, D. R. 139 2007 Oscillation theory for difference and functional differential equations. Zbl 0954.34002Agarwal, Ravi P.; Grace, Said R.; O’Regan, Donal 138 2000 Positive solutions for Dirichlet problems of singular nonlinear fractional differential equations. Zbl 1206.34009Agarwal, Ravi P.; O’Regan, Donal; Staněk, Svatoslav 136 2010 Infinite interval problems for differential, difference and integral equations. Zbl 0988.34002Agarwal, Ravi P.; O’Regan, Donal 129 2001 Multiple positive solutions of singular and nonsingular discrete problems via variational methods. Zbl 1070.39005Agarwal, Ravi P.; Perera, Kanishka; O’Regan, Donal 123 2004 On a new class of abstract impulsive differential equations. Zbl 1266.34101Hernández, Eduardo; O’Regan, Donal 119 2013 Fixed point theory for Lipschitzian-type mappings with applications. Zbl 1176.47037Agarwal, Ravi P.; O’Regan, Donal; Sahu, D. R. 110 2009 Positive solutions to certain classes of singular nonlinear second order boundary value problems. Zbl 0808.34022O’Regan, D. 109 1994 On recent developments in the theory of abstract differential equations with fractional derivatives. Zbl 1229.34004Hernández, Eduardo; O’Regan, Donal; Balachandran, Krishnan 106 2010 Oscillation theory for second order linear, half-linear, superlinear and sublinear dynamic equations. Zbl 1073.34002Agarwal, Ravi P.; Grace, Said R.; O’Regan, Donal 106 2002 Multiple positive solutions of singular discrete \(p\)-Laplacian problems via variational methods. Zbl 1098.39001Agarwal, Ravi P.; Perera, Kanishka; O’Regan, Donal 104 2005 Existence of solutions for semi-linear abstract differential equations with not instantaneous impulses. Zbl 1293.34019Pierri, Michelle; O’Regan, Donal; Rolnik, Vanessa 88 2013 Nonlinear boundary value problems on time scales. Zbl 0995.34016Agarwal, Ravi P.; O’Regan, Donal 82 2001 Some general existence principles and results for \((\varphi(y'))=qf(t,y,y'),0<t<1\). Zbl 0778.34013O’Regan, Donal 78 1993 Oscillation criteria for second-order nonlinear neutral delay dynamic equations. Zbl 1062.34068Agarwal, Ravi P.; O’Regan, Donal; Saker, S. H. 77 2004 Existence theory for nonlinear ordinary differential equations. Zbl 1077.34505O’Regan, Donal 75 1997 Multiple nonnegative solutions for second order impulsive differential equations. Zbl 1047.34008Agarwal, Ravi P.; O’Regan, Donal 74 2000 Nonlinear superlinear singular and nonsingular second order boundary value problems. Zbl 0902.34015Agarwal, Ravi P.; O’Regan, Donal 73 1998 Solvability of some fourth (and higher) order singular boundary value problems. Zbl 0795.34018O’Regan, Donal 73 1991 Eigenvalues and the one-dimensional \(p\)-Laplacian. Zbl 1002.34019Agarwal, Ravi P.; Lü, Haishen; O’Regan, Donal 72 2002 Anti-periodic solutions for fully nonlinear first-order differential equations. Zbl 1142.34313Chen, Yuqing; Nieto, Juan J.; O’Regan, Donal 67 2007 Discrete oscillation theory. Zbl 1084.39001Agarwal, Ravi P.; Bohner, Martin; Grace, Said R.; O’Regan, Donal 67 2005 Existence principles for nonlinear resonant operator and integral equations. Zbl 0932.45010Meehan, M.; O’Regan, D. 65 1998 Nonlinear Urysohn discrete equations on the infinite interval: a fixed-point approach. Zbl 1003.39017Agarwal, R. P.; O’Regan, D. 60 2001 Singular boundary value problems for superlinear second order ordinary and delay differential equations. Zbl 0863.34022Agarwal, Ravi P.; O’Regan, Donal 58 1996 Singular boundary value problems for first and second order impulsive differential equations. Zbl 1073.34025Agarwal, Ravi P.; Franco, Daniel; O’Regan, Donal 57 2005 Oscillation theory for second order dynamic equations. Zbl 1043.34032Agarwal, Ravi P.; Grace, Said R.; O’Regan, Donal 55 2003 Morse theoretic aspects of \(p\)-Laplacian type operators. Zbl 1192.58007Perera, Kanishka; Agarwal, Ravi P.; O’Regan, Donal 54 2010 Solvability of some nonlinear boundary value problems. Zbl 0653.34015Bobisud, L. E.; O’Regan, D.; Royalty, W. D. 52 1988 Fractional boundary value problems with singularities in space variables. Zbl 1268.34023O’Regan, Donal; Staněk, Svatoslav 48 2013 Analysis of autonomous Lotka-Volterra competition systems with random perturbation. Zbl 1258.34099Jiang, Daqing; Ji, Chunyan; Li, Xiaoyue; O’Regan, Donal 47 2012 Oscillation criteria for certain \(n\)th order differential equations with deviating arguments. Zbl 0997.34060Agarwal, Ravi P.; Grace, Said R.; O’Regan, Donal 47 2001 Existence theory for single and multiple solutions to singular positone boundary value problems. Zbl 0999.34018Agarwal, Ravi P.; O’Regan, Donal 47 2001 The extinction and persistence of the stochastic SIS epidemic model with vaccination. Zbl 1395.92180Zhao, Yanan; Jiang, Daqing; O’Regan, Donal 46 2013 Fixed-point theory for the sum of two operators. Zbl 0858.34049O’Regan, D. 46 1996 Multiplicity results for singular conjugate, focal, and \((N,P)\) problems. Zbl 0978.34018Agarwal, Ravi P.; O’Regan, Donal 45 2001 Positive solutions for mixed problems of singular fractional differential equations. Zbl 1232.26005Agarwal, Ravi P.; O’Regan, Donal; Staněk, Svatoslav 44 2012 A multiplicity result for second order impulsive differential equations via the Leggett Williams fixed point theorem. Zbl 1070.34042Agarwal, Ravi P.; O’Regan, Donal 43 2005 Twin solutions to singular Dirichlet problems. Zbl 0946.34022Agarwal, Ravi P.; O’Regan, Donal 41 1999 Boundary value problems for discrete equations. Zbl 0890.39001Agarwal, R. P.; O’Regan, D. 41 1997 Multiple positive solutions to superlinear periodic boundary value problems with repulsive singular forces. Zbl 1042.34047Jiang, Daqing; Chu, Jifeng; O’Regan, Donal; Agarwal, Ravi P. 40 2003 Initial and boundary value problems for fuzzy differential equations. Zbl 1048.34015O’Regan, Donal; Lakshmikantham, V.; Nieto, Juan J. 40 2003 Nonlinear contraction theorems in probabilistic spaces. Zbl 1135.54315O’Regan, Donal; Saadati, Reza 39 2008 The oscillation of certain higher-order functional differential equations. Zbl 1070.34083Agarwal, R. P.; Grace, S. R.; O’Regan, D. 39 2003 Strong convergence theorems for relatively nonexpansive mappings in Banach spaces with applications. Zbl 1201.65091Li, Xi; Huang, Nan-Jing; O’Regan, Donal 38 2010 Singular Dirichlet boundary value problems. I: Superlinear and nonresonant case. Zbl 0884.34028O’Regan, Donal 38 1997 Theory of singular boundary value problems. Zbl 0807.34028O’Regan, Donal 38 1994 First order impulsive initial and periodic problems with variable moments. Zbl 0930.34016Frigon, M.; O’Regan, D. 37 1999 A survey of Lyapunov functions, stability and impulsive Caputo fractional differential equations. Zbl 1343.34006Agarwal, Ravi; Hristova, Snezhana; O’Regan, Donal 36 2016 A fixed-point approach for nonlinear discrete boundary value problems. Zbl 0933.39004Agarwal, R. P.; O’Regan, D. 36 1998 Existence of solutions for first order ordinary differential equations with nonlinear boundary conditions. Zbl 1058.34015Franco, Daniel; Nieto, Juan J.; O’Regan, Donal 35 2004 A note on existence of nonnegative solutions to singular semi-positone problems. Zbl 0921.34027Agarwal, Ravi P.; O’Regan, Donal 35 1999 Impulsive differential equations with variable times. Zbl 0863.34015Frigon, Marlène; O’Regan, Donal 35 1996 Fixed-point theory for weakly sequentially continuous mappings. Zbl 1185.34026O’Regan, D. 34 1998 Positive solutions for \((p,n-p)\) conjugate boundary value problems. Zbl 0920.34027Agarwal, Ravi P.; O’Regan, Donal 34 1998 Existence theory for nonlinear integral and integrodifferential equations. Zbl 0905.45003O’Regan, Donal; Meehan, Maria 34 1998 Fixed point theorems for singlevalued and multivalued generalized contractions in metric spaces endowed with a graph. Zbl 1227.54053Nicolae, Adriana; O’Regan, Donal; Petruşel, Adrian 33 2011 Oscillation of second-order strongly superlinear and strongly sublinear dynamic equations. Zbl 1221.34083Grace, Said R.; Agarwal, Ravi P.; Bohner, Martin; O’Regan, Donal 33 2009 On existence and local attractivity of solutions of a quadratic Volterra integral equation of fractional order. Zbl 1147.45003Banaś, Józef; O’Regan, Donal 33 2008 Fourth-order problems with nonlinear boundary conditions. Zbl 1068.34013Franco, Daniel; O’Regan, Donal; Perán, Juan 33 2005 Anti-periodic boundary value problem for nonlinear first order ordinary differential equations. Zbl 1097.34015Franco, Daniel; Nieto, Juan J.; O’Regan, Donal 33 2003 Singular differential and integral equations with applications. Zbl 1055.34001Agarwal, Ravi P.; O’Regan, Donal 33 2003 Unbounded solutions for singular boundary value problems on the semi-infinite interval: upper and lower solutions and multiplicity. Zbl 1116.34016Yan, Baoqiang; O’Regan, Donal; Agarwal, Ravi P. 32 2006 Integral inclusions of upper semi-continuous or lower semi-continuous type. Zbl 0860.45007O’Regan, Donal 32 1996 Multiple positive solutions to systems of nonlinear semipositone fractional differential equations with coupled boundary conditions. Zbl 1340.34041Yuan, Chengjun; Jiang, Daqing; O’Regan, D.; Agarwal, Ravi 31 2012 Fuzzy fractional integral equations under compactness type condition. Zbl 1312.45009Agarwal, Ravi; Arshad, Sadia; O’Regan, Donal; Lupulescu, Vasile 31 2012 New oscillation criteria for second-order neutral functional dynamic equations via the generalized Riccati substitution. Zbl 1221.34245Saker, S. H.; O’Regan, Donal 31 2011 Differential mixed variational inequalities in finite dimensional spaces. Zbl 1186.49006Li, Xue-Song; Huang, Nan-Jing; O’Regan, Donal 31 2010 Multiple positive solutions for the one-dimensional singular \(p\)-Laplacian. Zbl 1048.34047Lü, Haishen; O’Regan, Donal; Zhong, Chengkui 31 2002 Triple solutions to boundary value problems on time scales. Zbl 0958.34021Agarwal, R. P.; O’Regan, D. 30 2000 A coupled system of boundary value problems. Zbl 0919.34022Agarwal, Ravi P.; O’Regan, Donal 30 1998 Boundary value problems on infinite intervals and semiconductor devices. Zbl 0594.34019Granas, A.; Guenther, R. B.; Lee, J. W.; O’Regan, D. 30 1986 Nodal solutions for second-order \(m\)-point boundary value problems with nonlinearities across several eigenvalues. Zbl 1101.34006Ma, Ruyun; O’Regan, Donal 29 2006 Controllability of Volterra-Fredholm type systems in Banach spaces. Zbl 1160.93005Hernández M., Eduardo; O’Regan, Donal 28 2009 Oscillation results for second-order nonlinear neutral delay dynamic equations on time scales. Zbl 1128.34042Saker, Samir H.; Agarwal, Ravi P.; O’Regan, Donal 28 2007 Existence theorems for the one-dimensional singular \(p\)-Laplacian equation with sign changing nonlinearities. Zbl 1031.34023Agarwal, Ravi P.; Lü, Haishen; O’Regan, Donal 28 2003 Theorems of Leray-Schauder type and applications. Zbl 1045.47002O’Regan, Donal; Precup, Radu 28 2001 Fixed point theorems for set-valued maps and existence principles for integral inclusions. Zbl 0956.47026O’Regan, Donal; Precup, Radu 28 2000 Existence results for nonlinear integral equations. Zbl 0851.45003O’Regan, Donal 28 1995 Lyapunov-type inequalities for a class of fractional differential equations. Zbl 1338.34023O’Regan, Donal; Samet, Bessem 27 2015 Stochastically asymptotically stability of the multi-group SEIR and SIR models with random perturbation. Zbl 1243.92047Yuan, Chengjun; Jiang, Daqing; O’Regan, Donal; Agarwal, Ravi P. 26 2012 Multiplicity results using bifurcation techniques for a class of boundary value problems of impulsive differential equations. Zbl 1221.34072Liu, Yansheng; O’Regan, Donal 26 2011 A stacking theorem approach for fuzzy differential equations. Zbl 1042.34027Agarwal, Ravi P.; O’Regan, Donal; Lakshmikantham, V. 26 2003 Existence theory for nonlinear Fredholm and Volterra integral equations on half-open intervals. Zbl 0920.45006Meehan, Maria; O’Regan, Donal 26 1999 Existence results for differential delay equations. I. Zbl 0782.34070Lee, John W.; O’Regan, Donal 26 1993 Topological transversality: applications to third order boundary value problems. Zbl 0628.34017O’Regan, Daniel J. 26 1987 Singular boundary value problems. Zbl 0584.34012Bobisud, L. E.; O’Regan, D.; Royalty, W. D. 26 1986 On abstract differential equations with non-instantaneous impulses. Zbl 1360.34131Hernández, Eduardo; Pierri, Michelle; O’Regan, Donal 25 2015 Periodic solution for a non-autonomous Lotka-Volterra predator-prey model with random perturbation. Zbl 1326.34091Zu, Li; Jiang, Daqing; O’Regan, Donal; Ge, Bin 25 2015 Existence and asymptotic stability of solutions of a perturbed fractional functional-integral equation with linear modification of the argument. Zbl 1220.45011Darwish, Mohamed Abdalla; Henderson, Johnny; O’Regan, Donal 25 2011 Oscillation of second-order damped dynamic equations on time scales. Zbl 1128.34022Saker, Samir H.; Agarwal, Ravi P.; O’Regan, Donal 25 2007 Positive solutions to singular and non-singular second-order boundary value problems. Zbl 0689.34015O’Regan, D. 25 1989 Existence of solutions to some singular initial value problems. Zbl 0646.34003Bobisud, L. E.; O’Regan, D. 25 1988 Nodal solutions for \(m\)-point boundary value problems using bifurcation methods. Zbl 1141.34009Sun, Jingxian; Xu, Xian; O’Regan, Donal 24 2008 Convergence analysis of solution sets for fuzzy optimization problems. Zbl 07163150Hung, Nguyen Van; Tam, Vo Minh; Tuan, Nguyen Huy; O’Regan, Donal 4 2020 Positive solutions for a system of Hadamard-type fractional differential equations with semipositone nonlinearities. Zbl 1432.34010Ding, Youzheng; Jiang, Jiqiang; O’Regan, Donal; Xu, Jiafa 4 2020 Hyers-Ulam stability and existence of solutions for fractional differential equations with Mittag-Leffler kernel. Zbl 1434.34014Liu, Kui; Wang, JinRong; Zhou, Yong; O’Regan, Donal 3 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 1458.91054Hung, Nguyen Van; Tam, Vo Minh; O’Regan, Donal; Cho, Yeol Je 2 2020 Finite approximate controllability of Hilfer fractional semilinear differential equations. Zbl 07254913Wang, JinRong; Ibrahim, A. G.; O’Regan, Donal 1 2020 Approximate solution of the backward problem for Kirchhoff’s model of parabolic type with discrete random noise. Zbl 1451.65135Triet, Nguyen Anh; Phuong, Nguyen Duc; O’Regan, Donal; Tuan, Nguyen Huy 1 2020 Periodicity of non-homogeneous trajectories for non-instantaneous impulsive heat equations. Zbl 1430.34021Yang, Peng; Wang, Jinrong; O’Regan, Donal 1 2020 Coincidence theory for multivalued maps satisfying compactness conditions on countable sets. Zbl 1432.54016O’Regan, Donal 1 2020 Bilevel equilibrium problems with lower and upper bounds in locally convex Hausdorff topological vector spaces. Zbl 1427.90249Hung, Nguyen Van; O’Regan, Donal 1 2020 Ulam-Hyers-Mittag-Leffler stability for \(\psi\)-Hilfer fractional-order delay differential equations. Zbl 1458.34128Liu, Kui; Wang, JinRong; O’Regan, Donal 9 2019 Existence and Ulam’s stability for conformable fractional differential equations with constant coefficients. Zbl 1422.34047Li, Mengmeng; Wang, JinRong; O’Regan, D. 7 2019 Iterative learning control for differential inclusions of parabolic type with noninstantaneous impulses. Zbl 1428.93052Liu, Shengda; Wang, JinRong; Shen, Dong; O’Regan, Donal 4 2019 Nonemptyness and compactness of the solution set for fractional evolution inclusions with non-instantaneous impulses. Zbl 1411.34022Wang, Jinrong; Ibrahim, Ahmed G.; O’Regan, Donal 4 2019 Relative controllability of delay differential systems with impulses and linear parts defined by permutable matrices. Zbl 1410.34235You, Zhongli; Wang, Jinrong; O’Regan, Donal; Zhou, Yong 4 2019 Hyers-Ulam stability for linear differences with time dependent and periodic coefficients. Zbl 1425.39015Buşe, Constantin; O’Regan, Donal; Saierli, Olivia 3 2019 Global attracting solutions to hilfer fractional differential inclusions of Sobolev type with noninstantaneous impulses and nonlocal conditions. Zbl 07114670Wang, Jinrong; Ibrahim, Ahmed Gamal; O’Regan, Donal 3 2019 Nontrivial solutions for a higher order nonlinear fractional boundary value problem involving Riemann-Liouville fractional derivatives. Zbl 1425.34031Zhang, Keyu; O’Regan, Donal; Xu, Jiafa; Fu, Zhengqing 3 2019 A higher integrability theorem from a reverse weighted inequality. Zbl 1441.26010Saker, Samir; O’Regan, Donal; Agarwal, Ravi 2 2019 Calculus of fuzzy vector-valued functions and almost periodic fuzzy vector-valued functions on time scales. Zbl 1423.26059Wang, Chao; Agarwal, Ravi P.; O’Regan, Donal 2 2019 A new method to prove the nonuniform dichotomy spectrum theorem in \(\mathbb{R}^n\). Zbl 1432.34074Xia, Yonghui; Bai, Yuzhen; O’Regan, Donal 2 2019 Abstract Leray-Schauder type alternatives and extensions. Zbl 1436.54037O’Regan, Donal 2 2019 Exponential stability and relative controllability of nonsingular delay systems. Zbl 1416.93173You, Zhongli; Wang, JinRong; O’Regan, D. 2 2019 On the approximate controllability for Hilfer fractional evolution hemivariational inequalities. Zbl 1412.34193Wang, JinRong; Liu, Xianghu; O’Regan, D. 2 2019 Levinson type inequalities and their extensions via convexity on time scales. Zbl 1409.26016Saker, S. H.; Osman, M. M.; O’Regan, D.; Agarwal, R. P. 2 2019 Stable manifolds for non-instantaneous impulsive nonautonomous differential equations. Zbl 1449.34128Li, Mengmeng; Wang, JinRong; O’Regan, Donal 1 2019 Asymptotical consensus of fractional-order multi-agent systems with current and delay states. Zbl 1430.34072Wang, Xuhui; Li, Xuesong; Huang, Nanjing; O’Regan, D. 1 2019 Controllability of Hilfer fractional noninstantaneous impulsive semilinear differential inclusions with nonlocal conditions. Zbl 1439.34015Wang, JinRong; Ibrahim, Gamal; O’Regan, Donal 1 2019 Basic concepts of Riemann-Liouville fractional differential equations with non-instantaneous impulses. Zbl 1425.34003Agarwal, Ravi; Hristova, Snezhana; O’Regan, Donal 1 2019 Hyers-Ulam stability for linear differences with time dependent and periodic coefficients: the case when the monodromy matrix has simple eigenvalues. Zbl 1423.34070Buşe, Constantin; O’Regan, Donal; Saierli, Olivia 1 2019 A surjectivity problem for 3 by 3 matrices. Zbl 1422.30012Buşe, Constantin; O’Regan, Donal; Saierli, Olivia 1 2019 Asymptotically periodic behavior of solutions of fractional evolution equations of order \(1<\alpha <2\). Zbl 07093133Ren, Lulu; Wang, Jinrong; O’Regan, Donal 1 2019 Mittag-Leffler stability for non-instantaneous impulsive Caputo fractional differential equations with delays. Zbl 07093132Agarwal, Ravi; Hristova, Snezhana; O’Regan, Donal 1 2019 Lyapunov-type inequalities for coupled systems of nonlinear fractional differential equations via a fixed point approach. Zbl 1453.26015Jleli, Mohamed; O’Regan, Donal; Samet, Bessem 1 2019 Fixed point theory for countably weakly condensing maps and multimaps in non-separable Banach spaces. Zbl 07008100Ben Amar, Afif; Derbel, Saoussen; O’Regan, Donal; Xiang, Tian 1 2019 A note on general coincidence theory for set-valued maps in topological vector spaces. Zbl 1396.54042O’Regan, Donal 1 2019 On the orbital Hausdorff dependence of differential equations with non-instantaneous impulses. Zbl 1384.34023Yang, Dan; Wang, JinRong; O’Regan, Donal 13 2018 Topological structure of the solution set for fractional non-instantaneous impulsive evolution inclusions. Zbl 1398.34088Wang, JinRong; Ibrahim, A. G.; O’Regan, D. 11 2018 Positive solutions for a system of nonlinear semipositone boundary value problems with Riemann-Liouville fractional derivatives. Zbl 1393.34018Qiu, Xiaowei; Xu, Jiafa; O’Regan, Donal; Cui, Yujun 11 2018 Some comments and notes on almost periodic functions and changing-periodic time scales. Zbl 1371.26044Agarwal, Ravi P.; O’Regan, Donal 9 2018 Nontrivial solutions for boundary value problems of a fourth order difference equation with sign-changing nonlinearity. Zbl 1448.39023Zhang, Keyu; O’Regan, Donal; Fu, Zhengqing 7 2018 A note on initial value problems for fractional fuzzy differential equations. Zbl 1397.34013Ngo, Hoa Van; Lupulescu, Vasile; O’Regan, Donal 7 2018 Controllability for noninstantaneous impulsive semilinear functional differential inclusions without compactness. Zbl 1401.26018Wang, JinRong; Ibrahim, A. G.; O’Regan, D.; Zhou, Yong 7 2018 A class of nonlinear non-instantaneous impulsive differential equations involving parameters and fractional order. Zbl 1426.34021Yang, Dan; Wang, JinRong; O’Regan, D. 6 2018 Positive solutions for a system of semipositone fractional difference boundary value problems. Zbl 1400.39006Chen, Cheng; Xu, Jiafa; O’Regan, Donal; Fu, Zhengqing 6 2018 Representation of a solution for a fractional linear system with pure delay. Zbl 06826037Liang, Chengbin; Wang, JinRong; O’Regan, D. 6 2018 Iterative learning control for noninstantaneous impulsive fractional-order systems with varying trial lengths. Zbl 1405.93116Liu, Shengda; Wang, JinRong; Shen, Dong; O’Regan, D. 5 2018 Stationary points of set-valued contractive and nonexpansive mappings on ultrametric spaces. Zbl 1460.54044Hosseini, Meraj; Nourouzi, Kourosh; O’Regan, Donal 4 2018 Some stability properties related to initial time difference for Caputo fractional differential equations. Zbl 1393.34011Agarwal, Ravi; Hristova, Snezhana; O’Regan, Donal 4 2018 Hilfer-type fractional differential switched inclusions with noninstantaneous impulsive and nonlocal conditions. Zbl 1421.34043Wang, JinRong; Ibrahim, Ahmed Gamal; O’Regan, Donal 3 2018 On the solutions of certain fractional kinetic equations involving \(k\)-Mittag-Leffler function. Zbl 1446.35243Agarwal, P.; Chand, M.; Baleanu, D.; O’Regan, D.; Jain, Shilpi 3 2018 Existence and uniqueness of solutions for a first-order discrete fractional boundary value problem. Zbl 1401.39008Xu, Jiafa; O’Regan, Donal 3 2018 \(n_0\)-order \(\Delta\)-almost periodic functions and dynamic equations. Zbl 1402.26017Wang, Chao; Agarwal, Ravi P.; O’Regan, Donal 3 2018 A note on asymptotic behaviour of Mittag-Leffler functions. Zbl 1384.33036Wang, JinRong; Zhou, Yong; O’Regan, D. 3 2018 Ergodic property of a Lotka-Volterra predator-prey model with white noise higher order perturbation under regime switching. Zbl 1427.37070Zu, Li; Jiang, Daqing; O’Regan, Donal; Hayat, Tasawar; Ahmad, Bashir 2 2018 Coincidence for morphisms based on compactness principles. Zbl 1438.54146O’Regan, Donal 2 2018 \(F(\psi,\phi)\)-contractions for \(\alpha\)-admissible mappings on \(M\)-metric spaces. Zbl 06968543Monfared, Hossein; Asadi, Mehdi; Azhini, Mahdi; O’Regan, Donal 2 2018 On the class of relatively weakly demicompact nonlinear operators. Zbl 1455.58005Krichen, Bilel; O’Regan, Donal 2 2018 Coincidence for morphisms based on compactness conditions on countable sets. Zbl 1428.54016O’Regan, Donal 1 2018 Iterative techniques for the initial value problem for Caputo fractional differential equations with non-instantaneous impulses. Zbl 1427.34027Agarwal, Ravi; Hristova, S.; O’Regan, D. 1 2018 Existence and controllability for nonlinear fractional differential inclusions with nonlocal boundary conditions and time-varying delay. Zbl 1420.93008Cheng, Yi; Agarwal, Ravi P.; O’Regan, Donal 1 2018 A note on coincidence theory for noncompact morphisms. Zbl 1414.54026O’Regan, Donal 1 2018 Regularization and error estimates for an inverse heat problem under the conformable derivative. Zbl 1411.35286Vu, Ho; O’Regan, Donal; Hoa, Ngo Van 1 2018 Multiple solutions for fractional boundary value problems. Zbl 1409.34007Averna, Diego; O’Regan, Donal; Tornatore, Elisabetta 1 2018 Intersection theorems with applications in optimization. Zbl 1440.47045Agarwal, Ravi P.; Balaj, Mircea; O’Regan, Donal 1 2018 Coincidence point theorems on quasi-metric spaces via simulation functions and applications to \(G\)-metric spaces. Zbl 06969103Roldán López de Hierro, A. F.; Karapınar, E.; O’Regan, D. 1 2018 Some dynamic inequalities involving Hilbert and Hardy-Hilbert operators with kernels. Zbl 1401.26034O’Regan, Donal; Rezk, Haytham M.; Saker, Samir H. 1 2018 On second order differential equations with state-dependent delay. Zbl 06959358Hernández, Eduardo; Azevedo, Katia A. G.; O’Regan, Donal 1 2018 Controllability of fractional evolution inclusions with noninstantaneous impulses. Zbl 1401.34027Wang, JinRong; Ibrahim, A. G.; O’Regan, D. 1 2018 Positive solutions for a system of \(p\)-Laplacian boundary value problems. Zbl 1400.34039Xu, Jiafa; O’Regan, Donal; Zhang, Keyu 1 2018 Hölder regularity of Grobman-Hartman theorem for dynamic equations on measure chains. Zbl 1400.34139Xia, Yonghui; Chen, Lijun; Kou, Kit Ian; O’Regan, Donal 1 2018 On state dependent non-local conditions. Zbl 06892565Hernández, Eduardo; O’Regan, Donal 1 2018 Asymptotic behavior of discrete evolution families in Banach spaces. Zbl 1408.39010Buşe, Constantin; Khan, Aftab; Nguyen, Lan T.; O’Regan, Donal; Rahmat, Gul 1 2018 Inequalities of Hardy type and generalizations on time scales. Zbl 1384.26046Saker, Samir H.; Osman, Mahmoud M.; O’Regan, Donal; Agarwal, Ravi P. 1 2018 Stability by Lyapunov like functions of nonlinear differential equations with non-instantaneous impulses. Zbl 1361.34064Agarwal, Ravi; O’Regan, D.; Hristova, S. 18 2017 Non-instantaneous impulses in Caputo fractional differential equations. Zbl 1370.34008Agarwal, Ravi; Hristova, Snezhana; O’Regan, Donal 14 2017 Solving interval-valued fractional initial value problems under Caputo gH-fractional differentiability. Zbl 1368.34010Hoa, Ngo Van; Lupulescu, Vasile; O’Regan, Donal 13 2017 Noninstantaneous impulses in Caputo fractional differential equations and practical stability via Lyapunov functions. Zbl 1364.93551Agarwal, Ravi; Hristova, S.; O’Regan, D. 10 2017 Non-instantaneous impulses in differential equations. Zbl 1426.34001Agarwal, Ravi; Hristova, Snezhana; O’Regan, Donal 9 2017 Monotone iterative technique for the initial value problem for differential equations with non-instantaneous impulses. Zbl 1411.34031Agarwal, Ravi; O’Regan, D.; Hristova, S. 8 2017 Controllability of nonlinear delay oscillating systems. Zbl 1413.34256Liang, Chengbin; Wang, JinRong; O’Regan, Donal 8 2017 Asymptotic properties of the solutions of nonlinear non-instantaneous impulsive differential equations. Zbl 1373.93159Yang, Dan; Wang, JinRong; O’Regan, Donal 6 2017 Stability with initial time difference of Caputo fractional differential equations by Lyapunov functions. Zbl 1365.34008Agarwal, Ravi; O’Regan, Donal; Hristova, Snezhana 6 2017 Montone-iterative techniques for mild solutions of the initial value problem Caputo fractional differential equations with non-instantaneous impulses. Zbl 1386.34023Agarwal, Ravi; O’Regan, Donal; Hristova, Snezhana 4 2017 Asymptotic behavior of a stochastic population model with Allee effect by Lévy jumps. Zbl 1377.92076Zhang, Qiumei; Jiang, Daqing; Zhao, Yanan; O’Regan, Donal 4 2017 Some fractional integral inequalities involving \(m\)-convex functions. Zbl 1373.26021Jleli, Mohamed; O’Regan, Donal; Samet, Bessem 4 2017 Fractional semilinear equations with causal operators. Zbl 1358.34087Agarwal, Ravi P.; Asma; Lupulescu, Vasile; O’Regan, Donal 4 2017 New Hilbert dynamic inequalities on time scales. Zbl 1386.26035Saker, S. H.; Ahmed, A. M.; Rezk, H. M.; O’Regan, D.; Agarwal, R. P. 3 2017 P-moment exponential stability of Caputo fractional differential equations with noninstantaneous random impulses. Zbl 1378.34005Agarwal, Ravi; Hristova, Snezhana; O’Regan, Donal 3 2017 A variety of inverse Hilbert type inequalities on time scales. Zbl 1372.34038Saker, S. H.; Rezk, H. M.; O’Regan, D.; Agarwal, R. P. 3 2017 Weighted piecewise pseudo double-almost periodic solution for impulsive evolution equations. Zbl 1412.34246Wang, Chao; Agarwal, Ravi P.; O’Regan, Donal 2 2017 Generalized coincidence theory for set-valued maps. Zbl 1412.47025O’Regan, Donal 2 2017 Local stable manifold of Langevin differential equations with two fractional derivatives. Zbl 1444.34018Wang, JinRong; Peng, Shan; O’Regan, D. 2 2017 Coincidence theory for compact morphisms. Zbl 06830306O’Regan, Donal 2 2017 Essential maps and coincidence theory. Zbl 06816829Jleli, Mohamed; O’Regan, Donal; Samet, Bessem 2 2017 \(L^p\)-solutions for a class of fractional integral equations. Zbl 1370.45007Agarwal, Ravi P.; Asma; Lupulescu, Vasile; O’Regan, Donal 2 2017 Common fixed point theorems in topological vector spaces via intersection theorems. Zbl 1453.47005Agarwal, Ravi P.; Balaj, Mircea; O’Regan, Donal 2 2017 Existence of weak solutions for a fractional \(p\)-Laplacian equation in \(\mathbb R^N\). Zbl 1365.35049Xu, Jiafa; O’Regan, Donal; Dong, Wei 2 2017 Mönch sets and fixed point theorems for multimaps in locally convex topological vector spaces. Zbl 06696980Cardinali, T.; O’Regan, D.; Rubbioni, P. 2 2017 Strict stability with respect to initial time difference for Caputo fractional differential equations by Lyapunov functions. Zbl 1362.34009Agarwal, Ravi P.; O’Regan, Donal; Hristova, Snezhana 2 2017 Triple solutions for quasilinear one-dimensional \(p\)-Laplacian elliptic equations in the whole space. Zbl 1418.34065Bonanno, Gabriele; O’Regan, Donal; Vetro, Francesca 2 2017 ...and 933 more Documents all cited Publications top 5 cited Publications all top 5 Cited by 5,158 Authors 538 O’Regan, Donal 417 Agarwal, Ravi P. 101 Ge, Weigao 95 Wang, Jinrong 88 Ahmad, Bashir 78 Jiang, Daqing 77 Nieto Roig, Juan Jose 74 Ntouyas, Sotiris K. 71 Liu, Lishan 69 Wong, Patricia J. Y. 62 Li, Tongxing 60 Zhou, Yong 59 Al-saedi, Ahmed Eid Salem 56 Graef, John R. 52 Samet, Bessem 51 Benchohra, Mouffak 51 Henderson, Johnny Lee 51 Saker, Samir H. 51 Wu, Yonghong 48 Grace, Said Rezk 47 Ma, Ruyun 42 Kumam, Poom 41 Bohner, Martin J. 41 Liu, Yuji 41 Shi, Haiping 38 Băleanu, Dumitru I. 38 Hussain, Nawab 36 Cabada, Alberto 36 Liu, Wenbin 36 Staněk, Svatoslav 35 Kong, Lingju 35 Sadarangani, Kishin B. 34 Precup, Radu 34 Wei, Zhongli 33 Chen, Haibo 33 Cui, Yujun 32 Abbas, Mujahid 32 Cho, Yeol Je 32 Nashine, Hemant Kumar 31 Banaś, Józef 31 Feng, Meiqiang 31 Zhang, Chenghui 31 Zhang, Xinguang 30 Heidarkhani, Shapour 30 Rachůnková, Irena 30 Tian, Yu 28 Han, Zhenlai 28 Liu, Xia 28 Liu, Yansheng 26 Karapınar, Erdal 26 Khristova, Snezhana G. 26 Tariboon, Jessada 25 Fečkan, Michal 25 Luo, Zhiguo 25 Papageorgiou, Nikolaos S. 25 Yan, Baoqiang 25 Zhang, Xuemei 25 Zhang, Yuanbiao 24 Hernández, Eduardo M. 24 Imdad, Mohammad 24 Lee, Yong-Hoon Lee 24 Liu, Zhenhai 24 Minhós, Feliz Manuel 24 Perera, Kanishka 24 Shahzad, Naseer 24 Sun, Shurong 24 Xu, Jiafa 23 Kang, Shin Min 23 Li, Yongkun 23 Shen, Jianhua 22 Jleli, Mohamed 22 Saadati, Reza 22 Wang, Guotao 21 Chu, Jifeng 21 de la Sen, Manuel 21 Ouahab, Abdelghani 21 Radenovic, Stojan 21 Wang, Chao 21 Wang, Qiru 20 Li, Wan-Tong 20 Ngo Van Hoa 20 Rădulescu, Vicenţiu D. 20 Tang, Xianhua 19 Abbas, Said 19 Pei, Minghe 19 Sahu, Daya Ram 19 Sintunavarat, Wutiphol 19 Sugie, Jitsuro 19 Taoudi, Mohamed Aziz 19 Yao, Jen-Chih 19 Zhang, Jihui 18 Abdeljawad, Thabet 18 Altun, Ishak 18 Jankowski, Tadeusz 18 Kadelburg, Zoran 18 Lupulescu, Vasile 18 Xu, Xian 18 Yan, Zuomao 17 Aydi, Hassen 17 Darwish, Mohamed Abdalla ...and 5,058 more Authors all top 5 Cited in 398 Serials 431 Advances in Difference Equations 421 Nonlinear Analysis. 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