Was ist wirklich die Definition eines konvexen Polygons. (Qual e mesmo a definicao de poligono convexo.) (Portuguese)
Rev. Professor Mat., No. 21, 27-32 (1992).
The author contends that the intuitive notion of convex polygon needs to have precise definition so that it can be used safely and with generality. He then presents three definitions of convex polygon and shows that they are equivalent. Finally, he discusses the relative merits of each one of the given definitions.
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