Multiple nontrivial solutions for resona
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Michael Filippakis; Nikolaos S. Papageorgiou
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Article
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2010
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John Wiley and Sons
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English
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## Abstract We consider semilinear second order elliptic Neumann problems, which are resonant both at infinity (with respect to an eigenvalue __ฮป__~__k__~, __k__ โฅ 1) and at zero (with respect to the principal eigenvalue __ฮป__~0~ = 0). Using techniques from Morse theory, combined with variational m