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, Daniel J.; O’regan, Donal 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: 1,581 Publications since 1986, including 29 Books and 6 Additional arXiv Preprints 10 Contributions as Editor Reviewing Activity: 38 Reviews Co-Authors: 467 Co-Authors with 1,323 Joint Publications 12,743 Co-Co-Authors all top 5 Co-Authors 266 single-authored 659 Agarwal, Ravi P. 59 Wang, Jinrong 51 Jiang, Daqing 51 Khristova, Snezhana G. 39 Grace, Said Rezk 31 Xu, Jiafa 29 Lu, Haishen 28 Nguyen Huy Tuan 28 Wong, Patricia J. Y. 27 Saker, Samir H. 27 Yan, Baoqiang 25 Papageorgiou, Nikolaos S. 23 Meehan, Maria 22 Lupulescu, Vasile 22 Staněk, Svatoslav 21 Lakshmikantham, Vangipuram 19 El-Gebeily, Mohamed A. 19 Hernández, Eduardo M. 19 Saadati, Reza 19 Shahzad, Naseer 19 Wang, Chao 18 Huang, Nan-Jing 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 Fečkan, Michal 12 Franco Leis, Daniel 12 Moussaoui, Toufik 12 Zu, Li 11 Băleanu, Dumitru I. 11 Bonanno, Gabriele 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 Soori, Ebrahim 9 Taoudi, Mohamed Aziz 8 Bobisud, Larry E. 8 Can, Nguyen Huu 8 Górniewicz, Lech 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 Banaś, Józef 7 Cheng, Yi 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 5 Aghajani, Asadollah 5 Au, Vo Van 5 Cui, Yujun 5 Heidarkhani, Shapour 5 Kelevedjiev, Petio S. 5 Kopanov, Peter 5 Li, Lin 5 Liu, Rui 5 Luc, Nguyen Hoang 5 Nguyen Van Hung 5 Petruşel, Adrian 5 Rahman, Ghaus Ur 5 Sakthivel, Rathinasamy 5 Shakhmurov, Veli B. 5 Thach, Tran Ngoc 5 Wang, Fulong 5 Yang, Zhilin ...and 367 more Co-Authors all top 5 Serials 72 Applicable Analysis 57 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 28 Dynamics of Continuous, Discrete & Impulsive Systems. Series A. Mathematical Analysis 27 Mathematical and Computer Modelling 27 Fixed Point Theory 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 Nonlinear and Convex Analysis 18 Journal of Inequalities and Applications 18 Nonlinear Analysis Forum 18 Fixed Point Theory and Applications 17 Nonlinear Functional Analysis and Applications 15 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 13 Boundary Value Problems 12 Bulletin of the Australian Mathematical Society 12 Mathematische Nachrichten 12 Acta Applicandae Mathematicae 12 Aequationes Mathematicae 12 Georgian Mathematical Journal 12 Filomat 12 Communications in Nonlinear Science and Numerical Simulation 12 Nonlinear Analysis. Modelling and Control 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 Cubo 10 Differential Equations and Applications 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 9 Nonlinear Analysis. Real World Applications 8 Annales Polonici Mathematici 8 Proceedings of the Edinburgh Mathematical Society. Series 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 Numerical Functional Analysis and Optimization 7 Rendiconti del Circolo Matemàtico di Palermo. Serie II 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 4 Differential Equations ...and 166 more Serials all top 5 Fields 764 Ordinary differential equations (34-XX) 595 Operator theory (47-XX) 220 General topology (54-XX) 163 Integral equations (45-XX) 156 Partial differential equations (35-XX) 112 Real functions (26-XX) 108 Difference and functional equations (39-XX) 61 Calculus of variations and optimal control; optimization (49-XX) 53 Global analysis, analysis on manifolds (58-XX) 50 Systems theory; control (93-XX) 42 Algebraic topology (55-XX) 40 Biology and other natural sciences (92-XX) 39 Functional analysis (46-XX) 36 Probability theory and stochastic processes (60-XX) 24 Numerical analysis (65-XX) 20 Dynamical systems and ergodic theory (37-XX) 17 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) 9 Approximations and expansions (41-XX) 9 Abstract harmonic analysis (43-XX) 8 Functions of a complex variable (30-XX) 8 Fluid mechanics (76-XX) 6 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 Quantum theory (81-XX) 2 Information and communication theory, circuits (94-XX) 1 Mathematical logic and foundations (03-XX) 1 Differential geometry (53-XX) 1 Manifolds and cell complexes (57-XX) 1 Statistics (62-XX) Publications by Year all cited Publications top 5 cited Publications Citations contained in zbMATH Open 1,225 Publications have been cited 14,664 times in 9,258 Documents Cited by ▼ Year ▼ Variational approach to impulsive differential equations. Zbl 1167.34318 Nieto, Juan J.; O’Regan, Donal 306 2009 Dynamic equations on time scales: A survey. Zbl 1020.39008 Agarwal, Ravi; Bohner, Martin; O’Regan, Donal; Peterson, Allan 283 2002 Generalized contractions in partially ordered metric spaces. Zbl 1140.47042 Agarwal, Ravi P.; El-Gebeily, M. A.; O’Regan, Donal 271 2008 Iterative construction of fixed points of nearly asymptotically nonexpansive mappings. Zbl 1134.47047 Agarwal, R. P.; O’Regan, Donal; Sahu, D. R. 262 2007 On a new class of abstract impulsive differential equations. Zbl 1266.34101 Hernández, Eduardo; O’Regan, Donal 250 2013 Fixed point theory and applications. Zbl 0960.54027 Agarwal, Ravi P.; Meehan, Maria; O’Regan, Donal 234 2001 Fixed point theory for Lipschitzian-type mappings with applications. Zbl 1176.47037 Agarwal, Ravi P.; O’Regan, Donal; Sahu, D. R. 230 2009 Fixed point theorems for generalized contractions in ordered metric spaces. Zbl 1142.47033 O’Regan, Donal; Petruşel, Adrian 194 2008 Positive solutions for Dirichlet problems of singular nonlinear fractional differential equations. Zbl 1206.34009 Agarwal, Ravi P.; O’Regan, Donal; Staněk, Svatoslav 167 2010 Oscillation theory for difference and functional differential equations. Zbl 0954.34002 Agarwal, Ravi P.; Grace, Said R.; O’Regan, Donal 155 2000 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 150 2002 Existence of solutions for semi-linear abstract differential equations with not instantaneous impulses. Zbl 1293.34019 Pierri, Michelle; O’Regan, Donal; Rolnik, Vanessa 137 2013 Multiple positive solutions of singular and nonsingular discrete problems via variational methods. Zbl 1070.39005 Agarwal, Ravi P.; Perera, Kanishka; O’Regan, Donal 135 2004 On recent developments in the theory of abstract differential equations with fractional derivatives. Zbl 1229.34004 Hernández, Eduardo; O’Regan, Donal; Balachandran, Krishnan 130 2010 Discrete oscillation theory. Zbl 1084.39001 Agarwal, Ravi P.; Bohner, Martin; Grace, Said R.; O’Regan, Donal 122 2005 Infinite interval problems for differential, difference and integral equations. Zbl 0988.34002 Agarwal, Ravi P.; O’Regan, Donal 118 2001 Multiple positive solutions of singular discrete \(p\)-Laplacian problems via variational methods. Zbl 1098.39001 Agarwal, Ravi P.; Perera, Kanishka; O’Regan, Donal 118 2005 Positive solutions of differential, difference and integral equations. Zbl 1157.34301 Agarwal, Ravi P.; O’Regan, Donal; Wong, Patricia J. Y. 116 1999 Positive solutions to certain classes of singular nonlinear second order boundary value problems. Zbl 0808.34022 O’Regan, D. 109 1994 Existence theory for nonlinear ordinary differential equations. Zbl 1077.34505 O’Regan, Donal 95 1997 Nonlinear boundary value problems on time scales. Zbl 0995.34016 Agarwal, Ravi P.; O’Regan, Donal 86 2001 Some general existence principles and results for \((\varphi(y'))=qf(t,y,y'),0<t<1\). Zbl 0778.34013 O’Regan, Donal 84 1993 Multiple nonnegative solutions for second order impulsive differential equations. Zbl 1047.34008 Agarwal, Ravi P.; O’Regan, Donal 82 2000 Oscillation criteria for second-order nonlinear neutral delay dynamic equations. Zbl 1062.34068 Agarwal, Ravi P.; O’Regan, Donal; Saker, S. H. 82 2004 Morse theoretic aspects of \(p\)-Laplacian type operators. Zbl 1192.58007 Perera, Kanishka; Agarwal, Ravi P.; O’Regan, Donal 81 2010 Eigenvalues and the one-dimensional \(p\)-Laplacian. Zbl 1002.34019 Agarwal, Ravi P.; Lü, Haishen; O’Regan, Donal 78 2002 The extinction and persistence of the stochastic SIS epidemic model with vaccination. Zbl 1395.92180 Zhao, Yanan; Jiang, Daqing; O’Regan, Donal 77 2013 Analysis of autonomous Lotka-Volterra competition systems with random perturbation. Zbl 1258.34099 Jiang, Daqing; Ji, Chunyan; Li, Xiaoyue; O’Regan, Donal 76 2012 Nonlinear superlinear singular and nonsingular second order boundary value problems. Zbl 0902.34015 Agarwal, Ravi P.; O’Regan, Donal 75 1998 Solvability of some fourth (and higher) order singular boundary value problems. Zbl 0795.34018 O’Regan, Donal 75 1991 Anti-periodic solutions for fully nonlinear first-order differential equations. Zbl 1142.34313 Chen, Yuqing; Nieto, Juan J.; O’Regan, Donal 73 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 65 2001 Singular boundary value problems for first and second order impulsive differential equations. Zbl 1073.34025 Agarwal, Ravi P.; Franco, Daniel; O’Regan, Donal 64 2005 Existence principles for nonlinear resonant operator and integral equations. Zbl 0932.45010 Meehan, M.; O’Regan, D. 63 1998 Nonlinear Urysohn discrete equations on the infinite interval: a fixed-point approach. Zbl 1003.39017 Agarwal, R. P.; O’Regan, D. 63 2001 Singular boundary value problems for superlinear second order ordinary and delay differential equations. Zbl 0863.34022 Agarwal, Ravi P.; O’Regan, Donal 59 1996 A survey of Lyapunov functions, stability and impulsive Caputo fractional differential equations. Zbl 1343.34006 Agarwal, Ravi; Hristova, Snezhana; O’Regan, Donal 59 2016 Fixed-point theory for the sum of two operators. Zbl 0858.34049 O’Regan, D. 58 1996 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 57 2009 Fixed point theory in metric type spaces. Zbl 1347.54001 Agarwal, Ravi P.; Karapınar, Erdal; O’Regan, Donal; Roldán-López-de-Hierro, Antonio Francisco 57 2015 Positive solutions for mixed problems of singular fractional differential equations. Zbl 1232.26005 Agarwal, Ravi P.; O’Regan, Donal; Staněk, Svatoslav 56 2012 Fractional boundary value problems with singularities in space variables. Zbl 1268.34023 O’Regan, Donal; Staněk, Svatoslav 55 2013 Existence theory for single and multiple solutions to singular positone boundary value problems. Zbl 0999.34018 Agarwal, Ravi P.; O’Regan, Donal 54 2001 Solvability of some nonlinear boundary value problems. Zbl 0653.34015 Bobisud, L. E.; O’Regan, D.; Royalty, W. D. 52 1988 Differential mixed variational inequalities in finite dimensional spaces. Zbl 1186.49006 Li, Xue-Song; Huang, Nan-Jing; O’Regan, Donal 52 2010 Multiplicity results for singular conjugate, focal, and \((N,P)\) problems. Zbl 0978.34018 Agarwal, Ravi P.; O’Regan, Donal 52 2001 Topological degree theory and applications. Zbl 1095.47001 O’Regan, Donal; Cho, Yeol Je; Chen, Yu-Qing 51 2006 Oscillation theory for second order dynamic equations. Zbl 1043.34032 Agarwal, Ravi P.; Grace, Said R.; O’Regan, Donal 51 2003 Fixed-point theory for weakly sequentially continuous mappings. Zbl 1185.34026 O’Regan, D. 50 1998 The oscillation of certain higher-order functional differential equations. Zbl 1070.34083 Agarwal, R. P.; Grace, S. R.; O’Regan, D. 50 2003 Global exponential stabilization of impulsive neural networks with unbounded continuously distributed delays. Zbl 1316.34079 Li, Xiaodi; O’Regan, Donal; Akca, Haydar 50 2015 Fuzzy fractional integral equations under compactness type condition. Zbl 1312.45009 Agarwal, Ravi; Arshad, Sadia; O’Regan, Donal; Lupulescu, Vasile 50 2012 Dynamic inequalities on time scales. Zbl 1318.26002 Agarwal, Ravi; O’Regan, Donal; Saker, Samir 49 2014 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 48 2015 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 45 2005 Boundary value problems for discrete equations. Zbl 0890.39001 Agarwal, R. P.; O’Regan, D. 45 1997 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 45 2015 Stability of Caputo fractional differential equations by Lyapunov functions. Zbl 1374.34005 Agarwal, Ravi; O’Regan, Donal; Hristova, Snezhana 44 2015 Lyapunov-type inequalities for a class of fractional differential equations. Zbl 1338.34023 O’Regan, Donal; Samet, Bessem 44 2015 Initial and boundary value problems for fuzzy differential equations. Zbl 1048.34015 O’Regan, Donal; Lakshmikantham, V.; Nieto, Juan J. 44 2003 On abstract differential equations with non-instantaneous impulses. Zbl 1360.34131 Hernández, Eduardo; Pierri, Michelle; O’Regan, Donal 44 2015 On existence and local attractivity of solutions of a quadratic Volterra integral equation of fractional order. Zbl 1147.45003 Banaś, Józef; O’Regan, Donal 43 2008 Existence theory for nonlinear integral and integrodifferential equations. Zbl 0905.45003 O’Regan, Donal; Meehan, Maria 43 1998 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 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 42 2011 Twin solutions to singular Dirichlet problems. Zbl 0946.34022 Agarwal, Ravi P.; O’Regan, Donal 42 1999 Theorems of Leray-Schauder type and applications. Zbl 1045.47002 O’Regan, Donal; Precup, Radu 42 2001 Nonlinear contraction theorems in probabilistic spaces. Zbl 1135.54315 O’Regan, Donal; Saadati, Reza 41 2008 Impulsive differential equations with variable times. Zbl 0863.34015 Frigon, Marlène; O’Regan, Donal 40 1996 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 Controllability of Volterra-Fredholm type systems in Banach spaces. Zbl 1160.93005 Hernández M., Eduardo; O’Regan, Donal 39 2009 Hardy type inequalities on time scales. Zbl 1359.26002 Agarwal, Ravi P.; O’Regan, Donal; Saker, Samir H. 39 2016 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. 38 2006 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 Generalized Hardy, Copson, Leindler and Bennett inequalities on time scales. Zbl 1309.26018 Saker, S. H.; O’Regan, D.; Agarwal, R. 38 2014 Anti-periodic boundary value problem for nonlinear first order ordinary differential equations. Zbl 1097.34015 Franco, Daniel; Nieto, Juan J.; O’Regan, Donal 37 2003 Fourth-order problems with nonlinear boundary conditions. Zbl 1068.34013 Franco, Daniel; O’Regan, Donal; Perán, Juan 37 2005 Ulam-Hyers-Mittag-Leffler stability for \(\psi\)-Hilfer fractional-order delay differential equations. Zbl 1458.34128 Liu, Kui; Wang, JinRong; O’Regan, Donal 37 2019 A fixed-point approach for nonlinear discrete boundary value problems. Zbl 0933.39004 Agarwal, R. P.; O’Regan, D. 36 1998 Fixed point theorems for set-valued maps and existence principles for integral inclusions. Zbl 0956.47026 O’Regan, Donal; Precup, Radu 36 2000 Existence results for nonlinear integral equations. Zbl 0851.45003 O’Regan, Donal 36 1995 New oscillation criteria for second-order neutral functional dynamic equations via the generalized Riccati substitution. Zbl 1221.34245 Saker, S. H.; O’Regan, Donal 36 2011 Positive solutions for \((p,n-p)\) conjugate boundary value problems. Zbl 0920.34027 Agarwal, Ravi P.; O’Regan, Donal 36 1998 First order impulsive initial and periodic problems with variable moments. Zbl 0930.34016 Frigon, M.; O’Regan, D. 36 1999 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. 36 2012 A note on existence of nonnegative solutions to singular semi-positone problems. Zbl 0921.34027 Agarwal, Ravi P.; O’Regan, Donal 35 1999 Integral inclusions of upper semi-continuous or lower semi-continuous type. Zbl 0860.45007 O’Regan, Donal 35 1996 Extremal solutions for nonlinear fractional boundary value problems with \(p\)-Laplacian. Zbl 1323.34004 Ding, Youzheng; Wei, Zhongli; Xu, Jiafa; O’Regan, Donal 35 2015 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 35 2012 Singular differential and integral equations with applications. Zbl 1055.34001 Agarwal, Ravi P.; O’Regan, Donal 34 2003 A note on initial value problems for fractional fuzzy differential equations. Zbl 1397.34013 Ngo, Hoa Van; Lupulescu, Vasile; O’Regan, Donal 34 2018 Weak solutions of ordinary differential equations in Banach spaces. Zbl 0933.34068 O’Regan, D. 33 1999 An introduction to ordinary differential equations. Zbl 1158.34001 Agarwal, Ravi P.; O’Regan, Donal 32 2008 Oscillation results for second-order nonlinear neutral delay dynamic equations on time scales. Zbl 1128.34042 Saker, Samir H.; Agarwal, Ravi P.; O’Regan, Donal 32 2007 Multiplicity results using bifurcation techniques for a class of boundary value problems of impulsive differential equations. Zbl 1221.34072 Liu, Yansheng; O’Regan, Donal 32 2011 Triple solutions to boundary value problems on time scales. Zbl 0958.34021 Agarwal, R. P.; O’Regan, D. 32 2000 Nodal solutions for second-order \(m\)-point boundary value problems with nonlinearities across several eigenvalues. Zbl 1101.34006 Ma, Ruyun; O’Regan, Donal 32 2006 Boundary value problems on infinite intervals and semiconductor devices. Zbl 0594.34019 Granas, A.; Guenther, R. B.; Lee, J. W.; O’Regan, D. 32 1986 Solving interval-valued fractional initial value problems under Caputo gH-fractional differentiability. Zbl 1368.34010 Hoa, Ngo Van; Lupulescu, Vasile; O’Regan, Donal 32 2017 Collectively coincidence-type results and applications. Zbl 1514.47084 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 A note on noncompact collectively coincidence point theory. Zbl 07773831 O’Regan, Donal 1 2023 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 1 2023 Maximal elements and equilibria for generalized majorized maps. Zbl 07640681 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 07697394 O’Regan, Donal 1 2023 Mixed vector equilibrium-like problems on Hadamard manifolds: error bound analysis. Zbl 1518.47095 Nguyen Van Hung; Vo Minh Tam; 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 15 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. 8 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 Almost periodic fuzzy multidimensional dynamic systems and applications on time scales. Zbl 1506.34010 Wang, Chao; Agarwal, Ravi P.; O’Regan, Donal 4 2022 Convergence analysis for iterative learning control of conformable impulsive differential equations. Zbl 1483.34025 Qiu, Wanzheng; Fečkan, Michal; O’Regan, Donal; Wang, JinRong 4 2022 Collectively fixed point theory in the compact and coercive cases. Zbl 1516.54044 O’Regan, Donal 4 2022 Lyapunov functions and stability of Caputo fractional differential equations with delays. Zbl 1503.34138 Agarwal, Ravi; Hristova, Snezhana; O’Regan, Donal 3 2022 Relative controllability of impulsive multi-delay differential systems. Zbl 1494.34170 You, Zhongli; Fečkan, Michal; Wang, JinRong; O’Regan, Donal 3 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 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 2 2022 \(\lozenge_\alpha \)-measurability and combined measure theory on time scales. Zbl 1502.26029 Wang, Chao; Qin, Guangzhou; Agarwal, Ravi P.; O’Regan, Donal 2 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 2 2022 Stability analysis of second order impulsive differential equations. Zbl 1501.34052 Wen, Qian; Wang, JinRong; 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 Existence and stability of solutions to neutral conformable stochastic functional differential equations. Zbl 1483.34113 Xiao, Guanli; Wang, JinRong; O’Regan, D. 1 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 1 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 1 2022 A strong convergence theorem for solving an equilibrium problem and a fixed point problem using the Bregman distance. Zbl 07618994 Ghadampour, Mostafa; Soori, Ebrahim; Agarwal, Ravi P.; O’Regan, Donal 1 2022 Coincidence and maximal type results for set valued maps. Zbl 07640271 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 Stability analysis for conformable non-instantaneous impulsive differential equations. Zbl 1493.34047 Ding, Yuanlin; O’Regan, Donal; Wang, JinRong 1 2022 Equilibria for abstract economies in Hausdorff topological vector spaces. Zbl 1497.91171 O’Regan, Donal 1 2022 Integral representations of scalar delay non-instantaneous impulsive Riemann-Liouville fractional differential equations. Zbl 1507.34074 Agarwal, Ravi; Hristova, S.; O’Regan, D. 1 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 1 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 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 13 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 Controllability of stochastic nonlinear oscillating delay systems driven by the Rosenblatt distribution. Zbl 1462.34104 Sathiyaraj, T.; Wang, JinRong; O’Regan, D. 11 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 8 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 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. 6 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 5 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 5 2021 Relative controllability of delay multi-agent systems. Zbl 1525.93024 Si, Yuanchao; Fečkan, Michal; Wang, JinRong; O’Regan, Donal 4 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 4 2021 Relative controllability of a stochastic system using fractional delayed sine and cosine matrices. Zbl 1485.93081 Wang, JinRong; Sathiyaraj, T.; O’Regan, Donal 4 2021 Self-improving properties of discrete Muckenhoupt weights. Zbl 1512.40003 Saker, Samir H.; O’Regan, Donal; Agarwal, Ravi P. 4 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 Weighted pseudo \(\delta\)-almost automorphic functions and abstract dynamic equations. Zbl 1470.26051 Wang, Chao; Agarwal, Ravi P.; O’Regan, Donal 3 2021 Continuation theorems for Mönch countable compactness-type set-valued maps. Zbl 1462.54019 O’Regan, Donal 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 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 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 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 2 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 Unique solvability of fractional quadratic nonlinear integral equations. Zbl 1488.45016 Darwish, Mohamed Abdalla; Metwali, Mohamed M. A.; O’Regan, Donal 2 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. 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 Maps with weakly sequentially closed graphs satisfying compactness conditions on countable sets. Zbl 1479.47053 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 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 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 Trajectory approximately controllability and optimal control for noninstantaneous impulsive inclusions without compactness. Zbl 1497.34091 Liu, Shengda; Wang, Jinrong; 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 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 1 2021 Essential weakly Mönch type maps and continuation theory. Zbl 1516.54043 O’Regan, Donal 1 2021 Mittag-Leffler stability for impulsive Caputo fractional differential equations. Zbl 1483.34010 Agarwal, R.; Hristova, S.; O’Regan, D. 1 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 1 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 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. 1 2021 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 25 2020 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 23 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 19 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 18 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 17 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 13 2020 Well-posedness results for a class of semilinear time-fractional diffusion equations. Zbl 1462.35435 de Andrade, Bruno; Van Au, Vo; O’Regan, Donal; Tuan, Nguyen Huy 12 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 12 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 12 2020 Continuity with respect to fractional order of the time fractional diffusion-wave equation. Zbl 1455.35295 Tuan, Nguyen Huy; O’Regan, Donal; Ngoc, Tran Bao 11 2020 On a terminal value problem for pseudoparabolic equations involving Riemann-Liouville fractional derivatives. Zbl 1442.35235 Ngoc, Tran Bao; Zhou, Yong; O’Regan, Donal; Tuan, Nguyen Huy 11 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 11 2020 A new class of \((\omega,c)\)-periodic non-instantaneous impulsive differential equations. Zbl 1452.34027 Liu, Kui; Wang, JinRong; O’Regan, Donal; Fečkan, Michal 10 2020 On existence and regularity of a terminal value problem for the time fractional diffusion equation. Zbl 1469.35233 Tuan, Nguyen Huy; Ngoc, Tran Bao; Zhou, Yong; O’Regan, Donal 8 2020 Bilevel equilibrium problems with lower and upper bounds in locally convex Hausdorff topological vector spaces. Zbl 1427.90249 Hung, Nguyen Van; O’Regan, Donal 7 2020 Exact solutions of linear Riemann-Liouville fractional differential equations with impulses. Zbl 1448.34008 Agarwal, Ravi P.; Hristova, Snezhana; O’Regan, Donal 7 2020 Existence and uniqueness and first order approximation of solutions to atmospheric Ekman flows. Zbl 1453.34027 Fečkan, Michal; Guan, Yi; O’Regan, Donal; Wang, JinRong 7 2020 Robustness for linear evolution equations with non-instantaneous impulsive effects. Zbl 1436.34058 Wang, JinRong; Li, Mengmeng; O’Regan, Donal; Fečkan, Michal 7 2020 Approximate solution for a 2-D fractional differential equation with discrete random noise. Zbl 1483.35331 Tuan, Nguyen Huy; Baleanu, Dumitru; Thach, Tran Ngoc; O’Regan, Donal; Can, Nguyen Huu 6 2020 Explicit solutions of initial value problems for systems of linear Riemann-Liouville fractional differential equations with constant delay. Zbl 1482.34188 Hristova, S.; Agarwal, Ravi; O’Regan, D. 5 2020 On the well-posedness of a nonlinear pseudo-parabolic equation. Zbl 1460.35212 Tuan, Nguyen Huy; Au, Vo Van; Tri, Vo Viet; O’Regan, Donal 5 2020 On the solutions of first-order linear impulsive fuzzy differential equations. Zbl 1464.34012 Liu, Rui; Wang, JinRong; O’Regan, Donal 5 2020 Existence of solutions for a new class of fuzzy differential inclusions with resolvent operators in Banach spaces. Zbl 1449.34007 Nguyen Van Hung; Vo Minh Tam; O’Regan, Donal 5 2020 Harnack type inequalities and multiple solutions in cones of nonlinear problems. Zbl 1444.47065 Herlea, Diana-Raluca; O’Regan, Donal; Precup, Radu 5 2020 Existence, uniqueness and continuous dependence of solutions to conformable stochastic differential equations. Zbl 1490.35529 Xiao, Guanli; Wang, JinRong; O’Regan, Donal 5 2020 Regularization of the fractional Rayleigh-Stokes equation using a fractional Landweber method. Zbl 1486.65055 Luc, Nguyen Hoang; Huynh, Le Nhat; O’Regan, Donal; Can, Nguyen Huu 5 2020 Approximation of mild solutions of a semilinear fractional differential equation with random noise. Zbl 1443.35176 Tuan, Nguyen Huy; Nane, Erkan; O’Regan, Donal; Phuong, Nguyen Duc 5 2020 Ulam type stability of first-order linear impulsive fuzzy differential equations. Zbl 1464.34013 Liu, Rui; Wang, JinRong; O’Regan, Donal 4 2020 \(C^\ast\)-algebra valued fuzzy normed spaces with application of Hyers-Ulam stability of a random integral equation. Zbl 1485.45013 Chaharpashlou, R.; O’Regan, Donal; Park, Choonkil; Saadati, Reza 4 2020 Coincidence results and Leray-Schauder alternatives between multivalued maps with continuous selections and admissible maps. Zbl 07286527 O’Regan, Donal 3 2020 Existence and Ulam stability of solutions for conformable impulsive differential equations. Zbl 1458.34028 Qiu, Wanzheng; Wang, JinRong; O’Regan, Donal 3 2020 Positive almost periodic solution for a noninstantaneous impulsive Lasota-Wazewska model. Zbl 1451.34104 Li, Mengmeng; Wang, JinRong; O’Regan, Donal 3 2020 ...and 1125 more Documents all cited Publications top 5 cited Publications all top 5 Cited by 7,294 Authors 635 O’Regan, Donal 472 Agarwal, Ravi P. 146 Wang, Jinrong 126 Jiang, Daqing 118 Ahmad, Bashir 93 Nieto Roig, Juan Jose 90 Ge, Weigao 90 Ntouyas, Sotiris K. 87 Benchohra, Mouffak 85 Al-saedi, Ahmed Eid Salem 78 Grace, Said Rezk 78 Graef, John R. 76 Zhou, Yong 75 Liu, Lishan 74 Băleanu, Dumitru I. 67 Li, Tongxing 65 Wong, Patricia J. 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Terceira Série 17 Journal of Mathematical Extension 16 Journal of Mathematical Physics ...and 430 more Serials all top 5 Cited in 62 Fields 5,177 Ordinary differential equations (34-XX) 2,999 Operator theory (47-XX) 937 Real functions (26-XX) 935 General topology (54-XX) 909 Difference and functional equations (39-XX) 901 Partial differential equations (35-XX) 769 Integral equations (45-XX) 511 Biology and other natural sciences (92-XX) 493 Systems theory; control (93-XX) 455 Numerical analysis (65-XX) 365 Probability theory and stochastic processes (60-XX) 346 Calculus of variations and optimal control; optimization (49-XX) 323 Global analysis, analysis on manifolds (58-XX) 268 Dynamical systems and ergodic theory (37-XX) 173 Functional analysis (46-XX) 138 Operations research, mathematical programming (90-XX) 77 Special functions (33-XX) 66 Game theory, economics, finance, and other social and behavioral sciences (91-XX) 64 Approximations and expansions (41-XX) 59 Mechanics of deformable solids (74-XX) 46 Integral transforms, operational calculus (44-XX) 45 Fluid mechanics (76-XX) 42 Measure and integration (28-XX) 38 Combinatorics (05-XX) 38 Statistical mechanics, structure of matter (82-XX) 36 Computer science (68-XX) 33 Algebraic topology (55-XX) 30 Harmonic analysis on Euclidean spaces (42-XX) 29 Abstract harmonic analysis (43-XX) 29 Mechanics of particles and systems (70-XX) 25 Sequences, series, summability (40-XX) 23 Linear and multilinear algebra; matrix theory (15-XX) 18 Quantum theory (81-XX) 16 Mathematical logic and foundations (03-XX) 16 Convex and discrete geometry (52-XX) 15 Information and communication theory, circuits (94-XX) 14 Statistics (62-XX) 13 Order, lattices, ordered algebraic structures (06-XX) 11 Number theory (11-XX) 11 Functions of a complex variable (30-XX) 9 Differential geometry (53-XX) 9 Geophysics (86-XX) 7 General and overarching topics; collections (00-XX) 6 Potential theory (31-XX) 6 Relativity and gravitational theory (83-XX) 5 Group theory and generalizations (20-XX) 5 Manifolds and cell complexes (57-XX) 5 Classical thermodynamics, heat transfer (80-XX) 4 Algebraic geometry (14-XX) 4 Associative rings and algebras (16-XX) 4 Several complex variables and analytic spaces (32-XX) 3 Optics, electromagnetic theory (78-XX) 2 Geometry (51-XX) 2 Astronomy and astrophysics (85-XX) 1 History and biography (01-XX) 1 General algebraic systems (08-XX) 1 Field theory and polynomials (12-XX) 1 Commutative algebra (13-XX) 1 Nonassociative rings and algebras (17-XX) 1 \(K\)-theory (19-XX) 1 Topological groups, Lie groups (22-XX) 1 Mathematics education (97-XX) Citations by Year Wikidata Timeline The data are displayed as stored in Wikidata under a Creative Commons CC0 License. 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