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References to 'skew-symmetric matrix'
1. Cayley's parameterization of orthogonal matrices by rspuzio
2. dimension of the special orthogonal group by stevecheng
3. Jacobi's theorem by Koro
4. proof of Rodrigues' rotation formula by stevecheng
5. self-dual by rmilson
6. simple and semi-simple Lie algebras by mathcam