ABSTRACT
Saddle Shape and Minimal Surfaces It is easy to see whether you are dealing with a fl at twodimensional surface: just put this surface on a table and try to fl atten it. If it lies evenly, then it is fl at or, as you now know, it is a surface with zero curvature . But if the surface is not fl at, how can you fi nd out whether it is positively or negatively curved?
