Rodrigues's Curvature Formula
where
is the unit Normal Vector and 
is one of the two Principal Curvatures.See also Normal Vector, Principal Curvatures- Lie Group
- Lie Groupoid
- Lie Product
- Lie-Type Group
- Life
- Life Expectancy
- Lift
- Lifting Problem
- Ligancy
- Likelihood
- Likelihood Ratio
- Limaçon
- Limaçon Evolute
- Limaçon of Pascal
- Limit
- Limit Comparison Test
- Limit Cycle
- Limit Point
- Lindeberg Condition
- Lindeberg-Feller Central Limit Theorem
- Lindelof's Theorem
- Lindemann-Weierstraß Theorem
- Lindenmayer System
- Line
- Linear Algebra