Mathematics – Differential Geometry
Scientific paper
2007-09-12
Mathematics
Differential Geometry
7 pages, 2figures
Scientific paper
It is showed that on a plane with a radial density the Four Vertex Theorem
holds for the class of all simple closed curves if and only if the density is
constant. But for the class of simple closed curves that are invariant under a
rotation about the origin, the Four Vertex Theorem holds for every radial
density.
Hieu Doan The
Nam Tran Le
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