Identity Matrix
The identity matrix is defined as the Matrix 
(or 
) such that
for all Vectors
. The identity matrix is
for
, ..., 
, where 
is the Kronecker Delta. Written explicitly,
- Lucas-Lehmer Test
- Lucas' Married Couples Problem
- Lucas Number
- Lucas Polynomial
- Lucas Polynomial Sequence
- Lucas Pseudoprime
- Lucas Sequence
- Lucas's Theorem
- Lucky Number
- Lucky Number of Euler
- LUCY
- LU Decomposition
- Ludolph's Constant
- Ludwig's Inversion Formula
- Lukács Theorem
- Lune (Plane)
- Lune (Solid)
- Lune (Surface)
- Lunule
- Lusin's Theorem
- LUX Method
- Lyapunov Characteristic Exponent
- Lyapunov Characteristic Number
- Lyapunov Condition
- Lyapunov Dimension