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cubic surface : ウィキペディア英語版 | cubic surface
A cubic surface is a projective variety studied in algebraic geometry. It is an algebraic surface in three-dimensional projective space defined by a single quaternary cubic polynomial which is homogeneous of degree 3 (hence, cubic). Cubic surfaces are del Pezzo surfaces. ==Examples== If has homogeneous co-ordinates , then the set of points where : is a cubic surface called the Fermat cubic surface. The Clebsch surface is the set of points where : Cayley's nodal cubic surface is the set of points where :
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