Can a $1 \times 1$ Matrix be any of these following type? [closed]
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All $1 \times 1$ matrices are square, diagonal, scalar, upper triangular, lower triangular, and symmetric.
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The only $1 \times 1$ matrix which is an identity matrix is $[1]$ .
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The only $1 \times 1$ matrix which is either skew-symmetric or null is $[0]$.