Abstract
In this chapter we present a second important illustration of the minimax method, the saddle-point theorem of Rabinowitz [64]. Since its proof uses the topological degree of Brouwer, we reserve this section for a brief presentation of this important topological tool and its main properties. The interested reader can see the details in [57].
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© 2007 Birkhäuser Boston
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Costa, D.G. (2007). The Saddle-Point Theorem. In: An Invitation to Variational Methods in Differential Equations. Birkhäuser Boston. https://doi.org/10.1007/978-0-8176-4536-6_5
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DOI: https://doi.org/10.1007/978-0-8176-4536-6_5
Publisher Name: Birkhäuser Boston
Print ISBN: 978-0-8176-4535-9
Online ISBN: 978-0-8176-4536-6
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