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Is there a name for a matrix that would be the identity matrix, except that it's not square? In other words, it has ones along the main diagonal, and zeroes off of the main diagonal. But as it's not a square matrix, it is not the identity matrix.

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    @BenjaminLim: usually, the set of all entries whose row and column indices are equal. (He's talking about block matrices of the form \begin{pmatrix} I & 0 \end{pmatrix} or $\begin{pmatrix} I \\ 0 \end{pmatrix}$, where $I$ is a square identity matrix and $0$ is a rectangular zero matrix of the appropriate size.)2012-05-27

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