In mathematics, and especially differential geometry, an affine sphere is a hypersurface for which the affine normals all intersect in a single point.
[1] The term affine sphere is used because they play an analogous role in affine differential geometry to that of ordinary spheres in Euclidean differential geometry.
[1] In that case, the intersection point mentioned above lies on the hyperplane at infinity.
Affine spheres have been the subject of much investigation, with many hundreds of research articles devoted to their study.
This differential geometry-related article is a stub.