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Periodic parabolic problems with nonlinearities indefinite in sign.

Tomás GodoyUriel Kaufmann — 2007

Publicacions Matemàtiques

Let Ω ⊂ R be a smooth bounded domain. We give sufficient conditions (which are also necessary in many cases) on two nonnegative functions a, b that are possibly discontinuous and unbounded for the existence of nonnegative solutions for semilinear Dirichlet periodic parabolic problems of the form Lu = λa (x, t) u - b (x, t) u in Ω × R, where 0 < p, q < 1 and λ > 0. In some cases we also show the existence of solutions u in the interior of the positive cone and that u can be chosen...

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