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What relation defines two matrices as similar?

  • A.one equals a scalar multiple of the other
  • B.both have the same order and the same trace
  • C.one equals an invertible matrix times the other times its inverse
  • D.one equals the transpose of the other

Answer: C

Similar matrices represent the same linear map in different bases, so they share their characteristic polynomial and hence their eigenvalues, trace and determinant. Diagonalisation is the search for a similar matrix that happens to be diagonal.

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