# Why is a zero matrix a reduced row echelon from? [closed]

Why is a zero matrix a reduced row echelon from?

Doesn't a matrix need to have a leading $1$ in order to be a reduced row echelon?

## closed as off-topic by Chappers, Servaes, user91500, Najib Idrissi, colormegoneSep 23 '15 at 14:27

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$$\begin{bmatrix} 1 & 1 \\ 1 & 1 \end{bmatrix}$$