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Existence principles for nonresonant operator and integral equations
(Elsevier BV, 1998-05-01)
Existence principles for nonresonant, nonlinear, operator equations are presented in this paper.
Singular differential equations with linear and nonlinear boundary conditions
(Elsevier BV, 1998-02-01)
Existence results are established for the singular equation y " + f(t, y) = 0, where f is not a Caratheodory function. Our nonlinearity f is allowed to change sign.