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.- Riemann Series Theorem
- Riemann's Formula
- Riemann-Siegel Functions
- Riemann's Integral Theorem
- Riemann's Moduli Problem
- Riemann's Moduli Space
- Riemann Space
- Riemann Sphere
- Riemann-Stieltjes Integral
- Riemann Sum
- Riemann Surface
- Riemann Tensor
- Riemann Theta Function
- Riemann Weighted Prime-Power Counting Function
- Riemann Xi Function
- Riemann Zeta Function
- Riesel Number
- Riesz-Fischer Theorem
- Riesz Representation Theorem
- Riesz's Theorem
- Riffle Shuffle
- Rigby Points
- Right Angle
- Right Conoid
- Right Hyperbola