Abstract
Many boundary value problems are equivalent to
where A : X → Y is a Mapping between two banach spaces. When the problem is variational, there exists a differentiable functional φ : X → ℝ such that \(A = \varphi ' \), i.e.
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© 1996 Birkhäuser
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Willem, M. (1996). Introduction. In: Minimax Theorems. Progress in Nonlinear Differential Equations and Their Applications, vol 24. Birkhäuser Boston. https://doi.org/10.1007/978-1-4612-4146-1_1
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DOI: https://doi.org/10.1007/978-1-4612-4146-1_1
Publisher Name: Birkhäuser Boston
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Online ISBN: 978-1-4612-4146-1
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