A Geometric Approach to Saddle Points of Surfaces
arXiv:0903.5400
Abstract
We outline an alternative approach to the geometric notion of a saddle point for real-valued functions of two variables. It is argued that this is more natural compared to the usual treatment of this topic in standard texts on Calculus.
9 pages, 4 figures; to appear in Austral. Math. Soc. Gaz. (May 2009)