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Hartshorne ellipse : ウィキペディア英語版 | Hartshorne ellipse In mathematics, a Hartshorne ellipse is an ellipse in the unit ball bounded by the 4-sphere S4 such that the ellipse and the circle given by intersection of its plane with S4 satisfy the Poncelet condition that there is a triangle with vertices on the circle and edges tangent to the ellipse. They were introduced by , who showed that they correspond to ''k'' = 2 instantons on S4. ==References==
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