Question about hollow matrix and diagonalization

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Diagonalizing a hollow matrix, defined as a matrix with zero entries along its diagonal, is indeed possible under certain conditions. The discussion highlights the example of the matrix $$\begin{pmatrix} 0 & 1 \\ 1 & 0 \end{pmatrix}$$, which can be diagonalized, while the zero matrix $$\begin{pmatrix} 0 & 0 \\ 0 & 0 \end{pmatrix}$$ is trivially diagonalizable. The ability to diagonalize such matrices depends on their specific properties and eigenvalues.

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Homework Statement
A simple question about the topic diagonal matrix and diagonalization.
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A quick and simple question. I just realized that this has been posted in the wrong section, but ill give it a try anyway. Does anyone know if it's possible to diagonalize a hollow matrix? What i mean by a hollow matrix is a matrix with only zero entries along the diagonal.
 
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Why not? Try diagonalizing$$\begin{pmatrix}
0 & 1 \\
1 & 0
\end{pmatrix}$$and see what you get.
 
Sometimes. It depends on the matrix.
\begin{pmatrix}
0 & 0 \\ 0 & 0
\end{pmatrix}
is obviously diagonalizable.
 

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