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    Author
    O'Regan, Donal (69)
    Agarwal, Ravi P. (38)Agarwal, Ravi P (6)Bohner, Martin (3)Grace, Said R. (3)... View MoreSubjectexistence (11)positive solutions (10)boundary-value-problems (9)differential-equations (7)fixed point (5)... View MoreDate Issued2009 (6)2008 (8)2006 (11)2005 (9)2004 (3)TypeArticle (69)

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    Multiple positive solutions to superlinear periodic boundary value problems with repulsive singular forces 

    Jiang, Daqing; Chu, Jifeng; O'Regan, Donal; Agarwal, Ravi P. (Elsevier BV, 2003-10-01)
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    Agarwal, Ravi P.; Perera, Kanishka; O'Regan, Donal (American Mathematical Society (AMS), 2006-03-01)
    The purpose of this paper is to use an appropriate variational framework to obtain positive solutions of some singular boundary value problems.
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    General existence principles for nonlocal boundary value problems withφ-laplacian and their applications 

    Agarwal, Ravi P.; O'Regan, Donal; Stanek, Svatoslav (Hindawi Limited, 2006-01-01)
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    On constant-sign periodic solutions in modelling the spread of interdependent epidemics 

    Agarwal, Ravi P.; O'Regan, Donal; Wong, Patricia J. Y. (Cambridge University Press (CUP), 2006-01-01)
    We consider the following model that describes the spread of n types of epidemics which are interdependent on each other: u(i)(t) = integral(t)(t-r) g(i)(t, s) f(i) (s, u(1)(s), u(2)(s),..., u(n)(s))ds, t is an element of ...
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    Positive solvability of systems of nonlinear hammerstein integral equations 

    Yang, Zhilin; O'Regan, Donal (Elsevier BV, 2005-11-01)
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    Multiple positive solutions of singular discrete p-laplacian problems via variational methods 

    Agarwal, Ravi P; Perera, Kanishka; O'Regan, Donal (Springer Nature, 2005-01-01)
    We obtain multiple positive solutions of singular discrete p-Laplacian problems using variational methods.
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    Construction of upper and lower solutions for singular discrete initial and boundary value problems via inequality theory 

    Lü, Haishen; O'Regan, Donal (Springer Nature, 2005-01-01)
    We present new existence results for singular discrete initial and boundary value problems. In particular our nonlinearity may be singular in its dependent variable and is allowed to change sign.
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    Solvability of singular second order m-point boundary value problems 

    Ma, Ruyun; O'Regan, Donal (Elsevier BV, 2005-01-01)
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    Twin positive periodic solutions of second order singular differential systems 

    Lin, Xiaoning; Jiang, Daqing; O'Regan, Donal; Agarwal, Ravi P. (Uniwersytet Mikolaja Kopernika/Nicolaus Copernicus University, 2005-06-01)
    In this paper, we study positive periodic solutions to singular second order differential systems. It is proved that such a problem has at least two positive periodic solutions. The proof relies on a nonlinear alternative ...
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    Multiplicity of positive periodic solutions to second order differential equations 

    Chu, Jifeng; Lin, Xiaoning; Jiang, Daqing; O'Regan, Donal; Agarwal, R. P. (Cambridge University Press (CUP), 2006-04-01)
    In this paper, we study the existence of positive periodic solutions to the equation x" = f (t, x). It is proved that such a equation has more than one positive periodic solution when the nonlinearity changes sign. ...
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