- #1
rbpl
- 28
- 0
Suppose the characteristic polynomial of a matrix A is [tex]\lambda[/tex]^3([tex]\lambda[/tex]-1)([tex]\lambda[/tex]-2). If the nullity of A is two, what are the possible Jordan normal forms of A up to conjugation?I think that an example of a matrix with such characteristic polynomial is:
0 0 0 0 0
0 0 0 0 0
0 0 0 0 0
0 0 0 1 0
0 0 0 0 2
But then isn't the nullity 1 in this case?
Otherwise, the possibilities for the above matrix are:
0 1 0 0 0
0 0 0 0 0
0 0 0 0 0
0 0 0 1 0
0 0 0 0 2
0 1 0 0 0
0 0 1 0 0
0 0 0 0 0
0 0 0 1 0
0 0 0 0 2
0 1 0 0 0
0 0 1 0 0
0 0 0 1 0
0 0 0 1 0
0 0 0 0 2
Am I correct?
What should I do about the nullity which is 2?
0 0 0 0 0
0 0 0 0 0
0 0 0 0 0
0 0 0 1 0
0 0 0 0 2
But then isn't the nullity 1 in this case?
Otherwise, the possibilities for the above matrix are:
0 1 0 0 0
0 0 0 0 0
0 0 0 0 0
0 0 0 1 0
0 0 0 0 2
0 1 0 0 0
0 0 1 0 0
0 0 0 0 0
0 0 0 1 0
0 0 0 0 2
0 1 0 0 0
0 0 1 0 0
0 0 0 1 0
0 0 0 1 0
0 0 0 0 2
Am I correct?
What should I do about the nullity which is 2?
Last edited: