Line of Curvature
A curve on a surface whose tangents are always in the direction of Principal Curvature. The equation of the lines of curvature can be written
where
and 
are the Coefficients of the first and second Fundamental Forms.See also Dupin's Theorem, Fundamental Forms, Principal Curvatures- van der Waerden Number
- van der Waerden's Theorem
- Vandiver's Criteria
- Vanishing Point
- van Kampen's Theorem
- van Wijngaarden-Deker-Brent Method
- Varga's Constant
- Variance
- Difference of Successes
- Difference Operator
- Difference Quotient
- Difference Set
- Difference Table
- Different
- Differentiable
- Differentiable Manifold
- Differential
- Differential Calculus
- Differential Equation
- Differential Form
- Differential Geometry
- Differential k-Form
- Differential Operator
- Differential Structure
- Differential Topology