define scalar matrix
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A square matrix in which all the principle diagonal elements are equal (≠0) and rest elements are zero, is known as scalar matrix.
[Example is given in the attachment]
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: A diagonal matrix in which all the diagonal elements are same, is called as a scalar matrix.
A = | 5 0 0 |
⠀ ⠀| 0 5 0 |
⠀⠀ | 0 0 5 | 3 x 3
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