Principal Vector
A tangent vector 
is a principal vector Iff
where
, 
, and 
are coefficients of the first Fundamental Form and 
, 
,
of the second Fundamental Form.See also Fundamental Forms, Principal Curve
References
Gray, A. Modern Differential Geometry of Curves and Surfaces. Boca Raton, FL: CRC Press, p. 410, 1993.
- Yff Points
- Yff Triangles
- y-Intercept
- Yin-Yang
- Young Diagram
- Young Girl-Old Woman Illusion
- Young Inequality
- Young's Integral
- Young Tableau
- Z
- Z-
- Z+
- Z*
- Zag Number
- Zarankiewicz's Conjecture
- Zariski Topology
- Zaslavskii Map
- Zassenhaus-Berlekamp Algorithm
- z-Axis
- z-Distribution
- Zeckendorf Representation
- Zeckendorf's Theorem
- Zeeman's Paradox
- Zeilberger's Algorithm
- Zeisel Number