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What are the eigenvalues of a triangular matrix?

  • A.the sums of its rows
  • B.the products of its columns
  • C.always zero and one only
  • D.its diagonal entries

Answer: D

The characteristic determinant is itself triangular, so it factorises into the diagonal differences directly. It is why reduction to triangular form is so valuable, though the reduction must preserve similarity rather than merely rank.

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