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A general existence principle for strong solutions to the dirichlet problem for the equation δ u + f(t, u) = 0
(Elsevier BV, 1997-05-01)
An existence principle is established for Delta u + f(t, u) = 0 on Omega, u = 0 on partial derivative Omega. Our theory relies on a fixed point result for weakly sequentially continuous and weakly compact maps.
Nonresonant nonlinear singular problems in the limit circle case
(Elsevier BV, 1996-02-01)
Integral inclusions of upper semi-continuous or lower semi-continuous type
(American Mathematical Society (AMS), 1996-08-01)
Topological results for set valued maps are used to establish existence results for integral inclusions of Volterra or Hammerstein type.
Second-order boundary value problems of singular type
(Elsevier BV, 1998-10-01)
Singular boundary value problems for superlinear second order ordinary and delay differential equations
(Elsevier BV, 1996-09-01)
Nonlinear superlinear singular and nonsingular second order boundary value problems
(Elsevier BV, 1998-02-01)
Positive solutions to singular initial value problems with sign changing nonlinearities
(Elsevier BV, 1998-08-01)
Multiple solutions for the dirichlet second-order boundary value problem of nonsingular type
(Elsevier BV, 1999-04-01)
Positive solutions of singular and nonsingular fredholm integral equations
(Elsevier BV, 1999-12-01)
Periodic solutions for abstract operator equations
(Elsevier BV, 1999-07-01)