Abstract
An elementary proof of the existence of multiple solutions of nonlinear operator equations is given. We show the existence, depending on a parameter in the equation, of either exactly two or at least four solutions for these equations.
Mathematics Subject Classification (2010). 35J60, (35J25, 47J30, 58E05).
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Lazer, A.C., McKenna, P.J. (2014). An Abstract Theorem in Nonlinear Analysis. In: de Figueiredo, D., do Ó, J., Tomei, C. (eds) Analysis and Topology in Nonlinear Differential Equations. Progress in Nonlinear Differential Equations and Their Applications, vol 85. Birkhäuser, Cham. https://doi.org/10.1007/978-3-319-04214-5_18
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DOI: https://doi.org/10.1007/978-3-319-04214-5_18
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