A square matrix A  is defined as follows.

$$A = (a_{ij})$$
$$a_{ij} = k \ \text{for } i = j$$
$$a_{ij} = 0 \ \text{for } i \neq j$$

Then the matrix is:

Diagonal matrix

Diagonal matrix

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Scalar matrix

Scalar matrix

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Skew symmetric matrix

Skew symmetric matrix

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Triangular matrix

Triangular matrix

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