Affine minimal surface
A surface whose affine curvature is zero. As distinct from ordinary minimal surfaces, which consist of saddle points only, an affine minimal surface may contain elliptic points as well. Thus, an elliptic paraboloid consists only of elliptic points, and is an affine minimal surface.
Affine minimal surface. Encyclopedia of Mathematics. URL: http://encyclopediaofmath.org/index.php?title=Affine_minimal_surface&oldid=32313