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What must be true of the diagonal entries of a skew-symmetric matrix?

  • A.they are the eigenvalues of the matrix
  • B.every one of them is zero
  • C.every one of them equals unity
  • D.they sum to zero but need not be zero individually

Answer: B

Since the transpose is the negative of the matrix, each diagonal entry must equal its own negative, and only zero satisfies that. It follows that the trace of a skew-symmetric matrix is necessarily zero, whatever its off-diagonal entries may be.

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