Let V be a finite dimensional vector spaces over the filed R and
T:V-->V be a linear operator such that T3=T. Is T
triangulable ? Justify your answer.
What if V=R3 then if the linear operator
T:R3-->R3 is not triangulable over R
then T is diagonalizable over C.
I have already got many wrong answer. I finals are coming. Please
help me with this homework.