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  • Multiplicity of solutions for Robin problems with double resonance
    Papageorgiou, Nikolaos, 1958- ; Rǎdulescu, Vicenţiu, 1958-
    We consider Robin boundary value problems with a reaction exhibiting double resonance at ▫$\pm \infty$▫ with respect to any nonprincipal spectral interval. We prove several multiplicity theorems, ... producing nontrivial smooth solutions with sign information. We also prove an exact multiplicity theorem. We employ variational tools from critical point theory, together with truncation-perturbation techniques, flow invariance arguments and Morse theory (critical groups). We produce up to seven nontrivial smooth solutions all with sign information.
    Type of material - article, component part ; adult, serious
    Publish date - 2018
    Language - english
    COBISS.SI-ID - 18330969