Rodrigues's Curvature Formula
where
is the unit Normal Vector and 
is one of the two Principal Curvatures.See also Normal Vector, Principal Curvatures- Discriminant (Binary Quadratic Form)
- Discriminant (Elliptic Curve)
- Discriminant (Metric)
- Discriminant (Module)
- Discriminant (Polynomial)
- Discriminant (Quadratic Curve)
- Discriminant (Quadratic Form)
- Discriminant (Second Derivative Test)
- Disdyakis Dodecahedron
- Disdyakis Triacontahedron
- Disjoint
- Disjunction
- Disjunctive Game
- Disk
- Disk Covering Problem
- Disk Lattice Points
- Dispersion Numbers
- Dispersion Relation
- Dispersion (Sequence)
- Dispersion (Statistics)
- Disphenocingulum
- Disphenoid
- Dissection
- Dissection Puzzles
- Dissipative System