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Author: O'Regan, Donal

• Bouafia, Dahmane; Moussaoui, Toufik; O'Regan, Donal: Multiplicity of positive solutions for second order quasilinear equations. (English). Mathematica Bohemica, vol. 145 (2020), issue 1, pp. 93-112
• Zu, Li; Jiang, Daqing; O'Regan, Donal: Population dynamical behavior of a single-species nonlinear diffusion system with random perturbation. (English). Czechoslovak Mathematical Journal, vol. 67 (2017), issue 4, pp. 867-890
• Agarwal, Ravi; O'Regan, Donal; Hristova, Snezhana: Stability of Caputo fractional differential equations by Lyapunov functions. (English). Applications of Mathematics, vol. 60 (2015), issue 6, pp. 653-676
• Agarwal, Ravi P.; Balaj, Mircea; O'Regan, Donal: An intersection theorem for set-valued mappings. (English). Applications of Mathematics, vol. 58 (2013), issue 3, pp. 269-278
• Galewski, Marek; O'Regan, Donal: Impulsive boundary value problems for $p(t)$-Laplacian's via critical point theory. (English). Czechoslovak Mathematical Journal, vol. 62 (2012), issue 4, pp. 951-967
• Hernández, Eduardo M.; O'Regan, Donal: Existence of solutions for abstract neutral integro-differential equations with unbounded delay. (English). Czechoslovak Mathematical Journal, vol. 61 (2011), issue 3, pp. 691-706
• Agarwal, Ravi P.; O'Regan, Donal; Staněk, Svatoslav: Dead cores of singular Dirichlet boundary value problems with $\phi $-Laplacian. (English). Applications of Mathematics, vol. 53 (2008), issue 4, pp. 381-399
• Lü, Haishen; O'Regan, Donal; Agarwal, Ravi P.: Existence to singular boundary value problems with sign changing nonlinearities using an approximation method approach. (English). Applications of Mathematics, vol. 52 (2007), issue 2, pp. 117-135
• Lü, Haishen; O'Regan, Donal; Agarwal, Ravi P.: On the existence of multiple periodic solutions for the vector $p$-Laplacian via critical point theory. (English). Applications of Mathematics, vol. 50 (2005), issue 6, pp. 555-568
• Jiang, Daqing; Xu, Xiaojie; O'Regan, Donal; Agarwal, Ravi P.: Singular positone and semipositone boundary value problems of second order delay differential equations. (English). Czechoslovak Mathematical Journal, vol. 55 (2005), issue 2, pp. 483-498
• Jiang, Daqing; Zhang, Lili; O'Regan, Donal; Agarwal, Ravi P.: Existence theory for single and multiple solutions to singular positone discrete Dirichlet boundary value problems to the one-dimension $p$-Laplacian. (English). Archivum Mathematicum, vol. 40 (2004), issue 4, pp. 367-381
• O'Regan, Donal: Fixed point theorems for weakly sequentially closed maps. (English). Archivum Mathematicum, vol. 36 (2000), issue 1, pp. 61-70
• O'Regan, Donal: Generalized quasivariational inequalities on Fréchet spaces. (English). Archivum Mathematicum, vol. 35 (1999), issue 3, pp. 245-254
• O'Regan, Donal: Fixed point theory for closed multifunctions. (English). Archivum Mathematicum, vol. 34 (1998), issue 1, pp. 191-197
• O'Regan, Donal: Fixed point theory for compact perturbations of pseudocontractive maps. (English). Archivum Mathematicum, vol. 34 (1998), issue 3, pp. 401-415
• O'Regan, Donal: Singular Dirichlet boundary value problems. II: Resonance case. (English). Czechoslovak Mathematical Journal, vol. 48 (1998), issue 2, pp. 269-289
• O'Regan, Donal: Landesman Lazer type results for first order periodic problems. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 38 (1997), issue 2, pp. 297-308
• O'Regan, Donal: Differential equations at resonance. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 36 (1995), issue 4, pp. 673-694
• Lee, John W.; O'Regan, Donal: Existence results for differential equations in Banach spaces. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 34 (1993), issue 2, pp. 239-251