Matrix notation
Double suffix notation:
Each element in a matrix has its own particular ‘address’ or location which can be defined by a system of double suffixes, the first indicating the row, the second the column, thus:
\[\Large
\begin{bmatrix}
a_{11} & a_{12} & a_{13} \\
a_{21} & a_{22} & a_{23}\\
a_{31} & a_{32} & a_{33}
\end{bmatrix}
\]
- Therefore, a 23 indicates the element in the second row and third column.
- Further, a whole matrix can be denoted by a single general element enclosed in brackets, or by a single letter.
- The above matrix can be denoted by (aij) or (a) or by A