LeanBack

yeah i know... and i tried, and i failed.. that's why i'm asking. anyway, let's see... a matrix is said to be nilpotent if there is some 'k' such that A^k = 0. diagonalizable matrix is such one that is similar to a diagonal matrix. and i can't get anything helpful from the rank 1 thing...

Hey guys I have this question i've been trying to solve for too long: Let A be an nxn matrix, rankA=1 , and n>1 . Prove that A is either nilpotent or diagonalizable. I have no clue how to even get started with that... though i attempted too much... Anyone can help? Thanks a lot