Special Matrices
# Zero matrix
A matrix with zeros instead of all its values:
$$ \begin{bmatrix} 0 & 0 & 0 & 0 \\0 & 0 & 0 & 0 \\0 & 0 & 0 & 0 \end{bmatrix} $$
# Square matrix
A matrix with a square shape, $n \times n$. Subtypes of the square matrix exist, especially defined by their diagonals:
# Diagonal Matrix
Only the entries on the diagonals are not zeros
# Identity matrix
^81da11
Just like a diagonal matrix, but all diagonals are 1
# Lower/Upper triangular matrix
^563d5a
One side of the diagonal must be all zeros