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Real Numbers (R)
All real numbers, also known as scalars.
Membership Symbol (∈)
Indicates membership.
Vector in R^n
A list of n scalars organized vertically into a list (lower-case bold letters).
Matrix
An m x n matrix is an array of scalars with m rows and n columns.
Square Matrix
An n x n matrix is a square.
(i,j) Entry of a Matrix
The scalar in the ith row and jth column of a matrix.
Transposition Property
(A^T)T = A.
Symmetric Matrix
S^T = S.
Trace of a Matrix
The sum of its diagonal elements.
Note 
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