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Blaschke's problem for timelike surfaces in pseudo-Riemannian space forms
We show that isothermic surfaces and S-Willmore surfaces are also the
solutions to the corresponding Blaschke's problem for both spacelike and
timelike surfaces in pseudo-Riemannian space forms. For timelike surfaces both
Willmore and isothermic, we obtain a description by minimal surfaces similar to
the classical results of Thomsen.Comment: 10 page
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