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General existence principles for nonlocal boundary value problems withφ-laplacian and their applications
(Hindawi Limited, 2006-01-01)
On constant-sign periodic solutions in modelling the spread of interdependent epidemics
(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 ...
Existence criteria for singular boundary value problems with sign changing nonlinearities
(Elsevier BV, 2002-08-01)
Singular problems modelling phenomena in the theory of pseudoplastic fluids
(Cambridge University Press (CUP), 2003-10-01)
Existence criteria are presented for nonlinear singular initial and boundary value problems. In particular our theory includes a problem arising in the theory of pseudoplastic fluids.
Fixed point theory for generalized contractions on spaces with two metrics
(Elsevier BV, 2000-08-01)
Twin positive periodic solutions of second order singular differential systems
(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 ...
Existence criteria for singular initial value problems with sign changing nonlinearities
(Hindawi Limited, 2001-01-01)
A general existence theory is presented for initial value problems where our nonlinearity may be singular in its dependent variable and may also change sign.
Oscillation criteria for second-order nonlinear neutral delay dynamic equations
(Elsevier BV, 2004-12-01)