Saddle Point (Function)
A Point of a Function or Surface which is a Stationary Point but not an Extremum.An example of a 1-D Function with a saddle point is 
, which has
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This function has a saddle point at
by the Extremum Test since 
and 
.An example of a Surface with a saddle point is the Monkey Saddle.- Sondat's Theorem
- Sonine Polynomial
- Sonine-Schafheitlin Formula
- Sonine's Integral
- Sophie Germain Prime
- Sorites Paradox
- Sorting
- Sort-Then-Add Sequence
- Source
- Sous-Double
- Souslin Set
- Souslin's Hypothesis
- Sous-Triple
- Space
- Space Conic
- Space Curve
- Space Diagonal
- Space Distance
- Space Division
- Space-Filling Curve
- Space-Filling Function
- Space-Filling Polyhedron
- Space Groups
- Space of Closed Paths
- Span (Geometry)