Multiple solutions of some nonlinear strongly resonant elliptic equations without the (PS) condition (Q1900381)

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scientific article; zbMATH DE number 811196
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Multiple solutions of some nonlinear strongly resonant elliptic equations without the (PS) condition
scientific article; zbMATH DE number 811196

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    Multiple solutions of some nonlinear strongly resonant elliptic equations without the (PS) condition (English)
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    29 April 1996
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    The author proves several lower bounds for the number of distinct pairs of solutions to the nonlinear resonance problem \(- \Delta u = f(x,u)\) in \(\Omega\), \(u = 0\) on \(\partial \Omega\), where \(f(x,s) = \lambda_ks + p(x,s)\), and \(\lambda_k\) is an eigenvalue of the Laplacian with homogeneous Dirichlet condition.
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    semilinear elliptic problem of resonance
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    number of solutions
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