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.
- Fermat Pseudoprime
- Fermat Quotient
- Fermat's Algorithm
- Fermat's Congruence
- Fermat's Conjecture
- Fermat's Factorization Method
- Fermat's Last Theorem
- Fermat's Lesser Theorem
- Fermat's Little Theorem
- Fermat's Little Theorem Converse
- Fermat Spiral Inverse Curve
- Fermat's Polygonal Number Theorem
- Fermat's Primality Test
- Fermat's Problem
- Fermat's Right Triangle Theorem
- Fermat's Sigma Problem
- Fermat's Simple Theorem
- Fermat's Spiral
- Fermat's Theorem
- Fermat's Two-Square Theorem
- Fermat Sum Theorem
- Fermi-Dirac Distribution
- Fern
- Ferrari's Identity
- Ferrers Diagram