All the diagonal elements are identical since a scalar matrix is the unit matrix multiplied by a scalar (here, of value 7).

Null A matrix, square or rectangular, whose elements are all zero is called a null matrix matrix or zero matrix. It is denoted 0 or [0].

Triangular A square matrix with all elements above (or below) the diagonal being zero is matrix called a lower (or upper) triangular matrix. For example,

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