A matrix is symmetric if:
AAll diagonal zero
BA = -A
CA = A^T (a_(ij) = a_(ji))
DA^T = -A
Answer & Solution
Correct answer: C. A = A^T (a_(ij) = a_(ji))
Symmetric: A = A^T. Mirror about main diagonal. Important for quadratic forms, real-symmetric have real eigenvalues.
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