Abstract
We generalize the classical Steiner symmetrization to surfaces with self-intersections. Then we apply the generalized Steiner symmetrization to several isoperimetric problems. For example, let Г⊂ℝ3 be an analytic plane Jordan curve which is symmetric with respect to a plane ϖ (ϖ⊅Г). LetS be a compact immersed surface bounded by Λ which has the smallest area among all compact surfaces bounded by Λ with a fixed volume. In this situation, under some additional assumptions, the wholeS is proved to be symmetric with respect to ϖ. When Λ is a round circle,S is proved to be a spherical cap or the flat disk bounded by Λ without any additional assumptions.
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Dedicated to Professor Hideki Ozeki on his 60th birthday
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Koiso, M. A generalization of Steiner symmetrization for immersed surfaces and its applications. Manuscripta Math 87, 311–325 (1995). https://doi.org/10.1007/BF02570477
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DOI: https://doi.org/10.1007/BF02570477