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Variational Methods for NLEV Approximation Near a Bifurcation Point

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  • Raffaele Chiappinelli

Abstract

We review some more and less recent results concerning bounds on nonlinear eigenvalues (NLEV) for gradient operators. In particular, we discuss the asymptotic behaviour of NLEV (as the norm of the eigenvector tends to zero) in bifurcation problems from the line of trivial solutions, considering perturbations of linear self-adjoint operators in a Hilbert space. The proofs are based on the Lusternik-Schnirelmann theory of critical points on one side and on the Lyapounov-Schmidt reduction to the relevant finite-dimensional kernel on the other side. The results are applied to some semilinear elliptic operators in bounded domains of . A section reviewing some general facts about eigenvalues of linear and nonlinear operators is included.

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  • Raffaele Chiappinelli, 2012. "Variational Methods for NLEV Approximation Near a Bifurcation Point," International Journal of Mathematics and Mathematical Sciences, Hindawi, vol. 2012, pages 1-32, November.
    • Handle: RePEc:hin:jijmms:102489
    DOI: 10.1155/2012/102489
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    1. Elliot Tonkes, 2011. "Bifurcation of Gradient Mappings Possessing the Palais-Smale Condition," International Journal of Mathematics and Mathematical Sciences, Hindawi, vol. 2011, pages 1-14, May.
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