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Just one of these quantities is unchanged when a matrix is replaced by a similar matrix. Which?

  • A.its being upper triangular
  • B.the basis in which it is expressed
  • C.its characteristic polynomial
  • D.its individual entries

Answer: C

Similar matrices represent the same map in different bases, so the characteristic polynomial and with it the eigenvalues, trace and determinant all survive. The entries, the triangular form and the basis itself all change.

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