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show that the matrix A=[[0,1,-1],[-1,0,1...

show that the matrix A=`[[0,1,-1],[-1,0,1],[1,-1,0]]` is a skew symmetric matrix

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`A^T = [(0,-1,1),(1,0,-1),(-1,1,0)] = -[(0,1,-1),(-1,0,1),(1,-1,0)] = -A therefore A` is skew symmetric
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