Abstract
When a functional is invariant, we use a more precise version of the quantitative deformation lemma.
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© 1996 Birkhäuser
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Willem, M. (1996). Fountain theorem. 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_4
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DOI: https://doi.org/10.1007/978-1-4612-4146-1_4
Publisher Name: Birkhäuser Boston
Print ISBN: 978-1-4612-8673-8
Online ISBN: 978-1-4612-4146-1
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