equichordal

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Equichordal point problem — In Euclidean plane geometry, the equichordal point problem is the question whether a closed planar convex body can have two equichordal points.[1] The problem was originally posed in 1916 by Fujiwara and in 1917 by Wilhelm Blaschke, Rothe and… … Wikipedia
Chordal problem — In the book[1] there is a generalization of the equichordal point problem attributed to R. Gardner. A Curve and Its Chord We consider a point O inside a Jordan curve with the property that for any chord [X … Wikipedia

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