Introduction
Matrices
A matrix is a rectangular array or arrangement of entries or elements displayed in rows and columns put within a square bracket [ ].
Matrices are denoted by capital letters [math]A,B,C,...[/math] etc.
General form of a matrix
If a matrix[math]A[/math] has [math]m[/math] rows and [math]n[/math] columns, then it is written as [br][math]A=\left[a_{ij}_{ }\right]_{m\times n},1\le i\le m,1\le j\le n.[/math]
Example of matrices
In a matrix, the horizontal lines of elements are known as rows and the vertical lines of elements are known as columns.
Above matrix [math]A[/math] has [math]2[/math] rows and [math]2[/math] columns, [math]B[/math] has [math]3[/math] rows and [math]3[/math] columns.