[old] Skew-symmetric Matrix

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In mathematics, particularly in linear algebra, a skew-symmetric matrix (also known as an antisymmetric or antimetric) is a square matrix A which is transposed and negative. This means that it satisfies the equation A = −A^T. If the entry in the i-th row and j-th column is a_ij, i.e. A = (a_ij) then the symmetric condition becomes a_ij = −a_ji.

You should determine whether the specified square matrix is skew-symmetric or not.

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