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Comparing the trace and determinant relations as checks on computed eigenvalues, the two together

  • A.apply only when the eigenvalues are distinct
  • B.fix both the sum and the product of the roots
  • C.fix the roots uniquely for any order of matrix
  • D.apply only to symmetric matrices

Answer: B

For a two by two matrix the pair of relations determines the roots completely, and for larger matrices they still provide two independent arithmetic checks. Both hold whatever the symmetry or the multiplicity of the eigenvalues.

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