| 词条 | Hartshorne ellipse |
| 释义 |
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 {{harvs|txt|last=Hartshorne|authorlink=Robin Hartshorne|year=1978}}, who showed that they correspond to k = 2 instantons on S4. References
1 : Algebraic geometry |
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