Mathematics – Metric Geometry
Scientific paper
2003-06-30
Mathematics
Metric Geometry
20 pages
Scientific paper
In 1926 S. Nakajima (= A. Matsumura) showed that any convex body in $\R^3$
with constant width, constant brightness, and boundary of class $C^2$ is a
ball. We show that the regularity assumption on the boundary is unnecessary, so
that balls are the only convex bodies of constant width and brightness.
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