Triangles on planar Jordan -curves and differential topology
Jean-Claude Hausmann
Université de Genève, Switzerland
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Abstract
We prove that a Jordan -curve in the plane contains the vertices of any non-flat triangle, up to translation and homothety with positive ratio. This is false if the curve is not . The proof makes use of configuration spaces, differential and algebraic topology as well as the smooth Schoenflies theorem. A partial generalization holds true in higher dimensions.