出典:Wikipedia
出典:『Wikipedia』 (2010/05/25 23:38 UTC 版)
In mathematics, the Clebsch diagonal cubic surface, or Klein's icosahedral cubic surface is a cubic surface studied by and all of whose 27 exceptional lines can be defined over the real numbers. The term Klein's icosahedral surface can refer to either this surface or its blowup at the 10 Eckardt points.