Seema posted an Question
April 05, 2020 • 19:08 pm 50 points
  • CSIR NET
  • Mathematical Sciences

Plz solve it

. 77. Let N be a non-zero 3 x 3 matrix with the property N = 0. Which of the following is/are true.? (A) N is not similar to a diagonal matrix. (B) Nis similar to a diagonal matrix. (C) Nhas one non-zero eigenvector. (D) N has three linearly independent eigen- vectorS.

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    Ujjawal vishal best-answer

    If A is a non zero matrix and A^k =0 then A is called nilpotent matrix. And, remember only nilpotent matrix which is diagonalizable, is null matrix. but here N is non zero ,so it is not diagonalizable. so, option a is correct and b is not correct. Clealry, N can't have 3 linearly independent eigen vectors otherwise it would make it diagonalizable which is not true in case of non zero nilpotent matrix. An example attached which shows it can have non zero eigen vectors. we have find eigen vectors at eigen values 0. So, option C ia correct and D is false.

    cropped107657442223751223.jpg
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