Linear Algebra Review

Here are some useful theorems you'll probably forget.

Matrix Multiplication Properties

Not Commutative: $A\cdot B \neq B\cdot A$

Identity Matrix: $A\cdot I=I\cdot A=A$

Matrix Inverse:

If A is an m x m matrix and A has an inverse, then $A^{-1}A=AA^{-1}=I$