## On a problem of W. J. Firey in connection with the characterization of spheres.(English)Zbl 0829.53053

Relations between Euclidean curvature functions and the support function on hyperovaloids have been studied for decades, in particular certain monotone relations characterizing spheres. The author studies a new relation and uses methods from evolution theory for his proof. With these methods the author gives an interesting new proof of the Theorem of Blaschke and Deicke, using Tzitzeica’s original (Euclidean) definition for proper affine spheres.
Reviewer: U.Simon (Berlin)

### MSC:

 53C45 Global surface theory (convex surfaces à la A. D. Aleksandrov) 53A07 Higher-dimensional and -codimensional surfaces in Euclidean and related $$n$$-spaces 53A15 Affine differential geometry
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