skew-symmetric matrix

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symmetric matrix: A(ij)=A(ji),or AT = A
skew symmetric: A(ij)= -A(ji), or AT = -A
Here, A(ij) is the element in ith row and jth column of matrix A.
AT is the transpose of matrix A.

e.g. A= [1 2 3]
[2 9 4]
[3 4 5] is symmetric.
A=[1 2 3]
[-2 9 -4]

[-3 4 5] is skew-symmetric.




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