Abstract
For proper lower semicontinuous functionals bounded from below which do not increase upon polarization, an improved version of Ekeland’s variational principle can be formulated in Banach spaces, which provides almost symmetric points.
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Squassina, M. On Ekeland’s variational principle. J. Fixed Point Theory Appl. 10, 191–195 (2011). https://doi.org/10.1007/s11784-011-0048-x
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DOI: https://doi.org/10.1007/s11784-011-0048-x