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What is required for a matrix of order n to be diagonalisable?

  • A.it must possess n distinct eigenvalues
  • B.it must be symmetric
  • C.its determinant must be non-zero
  • D.it must possess n linearly independent eigenvectors

Answer: D

Distinct eigenvalues guarantee independence and so suffice, but they are not necessary, since a repeated eigenvalue may still furnish enough independent vectors. A matrix falling short of n independent eigenvectors is called defective and cannot be diagonalised.

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