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is zero matrix of order 3 is a diagonal matrix

Since, a zero matrix or null matrix is a matrix with all its entries being zero and a diagonal matrix is a matrix in which the entries outside the main diagonal are all zero. The diagonal entries themselves may or may not be zero.
So a zero matrix can be called diagonal matrix as elements outside the diagonal is zero and diagonal entries are also zero

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yes , it tells only about non diagonal elements

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No, the zero matrix is not diagonal matrix , a matrix ia said to be diagonal matrix if all the elements in the diagonal are non zero elements and the remaining elements are zero. But if we consider the diagonal elements of zero matrix they are zeros therefore it is not a diagonal matrix

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noi

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