انواع المصفوفات

A square matrix is a matrix with the same number of rows and columns.Any two square matrices of the same order can be added and multiplied.
If all entries of A below the main diagonal are zero, A is called an upper triangular matrix. Similarly if all entries of A above the main diagonal are zero, A is called a lower triangular matrix.
The identity matrix In of size n is the n-by-n matrix in which all the elements on the main diagonal are equal to 1 and all other elements are equal to 0.
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