Duality Theorem
Dual pairs of Linear Programs are in ``strong duality'' if both are possible. The theorem wasfirst conceived by John von Neumann. 
The first written proof was an Air Force report byGeorge Dantzig, but credit is usually given to Tucker, Kuhn, and Gale.
- Lukács Theorem
- Lune (Plane)
- Lune (Solid)
- Lune (Surface)
- Lunule
- Lusin's Theorem
- LUX Method
- Lyapunov Characteristic Exponent
- Lyapunov Characteristic Number
- Lyapunov Condition
- Lyapunov Dimension
- Lyapunov Function
- Lyapunov's First Theorem
- Lyapunov's Second Theorem
- Lyndon Word
- Lyons Group
- Léon Anne's Theorem
- Lévy Constant
- Lévy Distribution
- Lévy Flight
- Lévy Fractal
- Lévy Function
- Lévy Tapestry
- Löwenheim-Skolem Theorem
- Lüroth's Theorem