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Vol 1 No 3
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On reciprocal curves and surfaces

Ye. S. Fedorov
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By this general name we mean all those curves and surfaces that are represented in the geometry of harmonic segments. Indeed, in this geometry, every midpoint of a segment uniquely corresponds to both end points of this segment; consequently, whatever curve is represented in this geometry as a set of end points of segments, its points are always grouped into pairs that are harmonic with respect to the main orthogonal sphere O, and the end points are located on the radius of this sphere.

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