I study machine learning.



∇_A tr AB = B^T
∇_A^T f(A) = (∇_A f(A))^T
∇_Atr ABA^TC = CAB + C^TAB^T
∇_A|A| = |A|(A^-1)^T (A non-singular)

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I also collect Free Dictionaries and anything by Richard Francis Burton.

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