Multiple solutions for strongly resonant
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Nikolaos S. Papageorgiou; Vasile Staicu
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Article
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2007
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Elsevier Science
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English
⚖ 268 KB
We considered a semilinear, second order periodic system. We assumed that the differential operator x → -x -Ax has zero as an eigenvalue and has no negative eigenvalues. Also we imposed a strong resonance condition (with respect to the zero eigenvalue) on the potential function F(t, x). Using the se