The Four-Vertex Theorem, The Evolute, and The Decomposition of Polygons

Details The Four-Vertex Theorem, The Evolute, and The Decomposition of Polygons The Four-Vertex Theorem, The Evolute, and The Decomposition of Polygons

2009-06-12

arxiv.org/abs/0906.2388v2

Mathematics

Metric Geometry

60 pages, 46 figures

Scientific paper

The Four-Vertex Theorem has been of interest ever since a discrete version appeared in 1813 due to Cauchy. Up until now, there have been many different versions of this theorem, both for discrete cases and smooth cases. In 2004, an approach relating the discrete Four-Vertex Theorem to the evolute was published, and here we will give an overview of this paper. We then will define the notion of the decomposition of polygons, and derive some new results about how this notion affects various types of extremality. We will see that from our fresh results we can easily derive discrete Four-Vertex Theorems.

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