there is none you weasel. the only good matrix is revolutions. :)
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Yes.
They are the same.
Zero is a number (a scalar quantity without unit) while zero vector (or null vector) is a vector quantity having zero magnitude and arbitrary direction.
A zero matrix is a matrix in which all of the entries are zero.
no,zero cannot be added to a null vector because zero is scalar but null vector is a vector,although null vector has zero magnitude but it has direction due to which it is called a vector.