A theory on perturbations of the Dirac operator.

Existence of nonnegative solutions are established for the periodic problem $y^{'} = f (t, y)$ a.eȯn $[0, T]$ , $y (0) = y (T)$ . Here the nonlinearity $f$ satisfies a Landesman Lazer type condition.

A note on the differential equation $y^{(n)} (x) + f (x) y^{α} (x) = 0,$ $0 < α < 1$

Jozef Eliáš (1984)

Mathematica Slovaca

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Oscillation of a forced nonlinear differential equation

Magdalena Vencková (1984)

Archivum Mathematicum

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