Abstract
When a function has some symmetry properties, one can expect to obtain more precise information on the set of critical points by using, in the minimax approach, correspondingly symmetric sets which are distinguished by a measure of their “size” given by an index theory.
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© 1989 Springer Science+Business Media New York
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Mawhin, J., Willem, M. (1989). Lusternik-Schnirelman Theory and Multiple Periodic Solutions with Fixed Energy. In: Critical Point Theory and Hamiltonian Systems. Applied Mathematical Sciences, vol 74. Springer, New York, NY. https://doi.org/10.1007/978-1-4757-2061-7_6
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DOI: https://doi.org/10.1007/978-1-4757-2061-7_6
Publisher Name: Springer, New York, NY
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