Is null matrix skew-symmetric My question is:
Is null matrix skew-symmetric?
I think it is true as A'=-A is trivially satisfied for a null matrix. 
Please help.

A skew-symmetric (or antisymmetric) matrix is a square matrix A, whose transpose is also its negative ($A'=-A$).
A null (or zero) matrix is an $m \times n$ matrix with all its entries being zero.
If the zero matrix is a square matrix, it satisfies the properties for skew-symmetricity. (if $m \neq n$, it is not skew-symmetric)
