Mathematics Asked on November 14, 2021
I had a problem: let $x=begin{bmatrix}3cr4end{bmatrix}$ and $A=begin{bmatrix}0&x^Tcr x&0end{bmatrix}$ is A diagonizable?
But when I plug in the matrix x and its transpose into A the dimensions don’t work out and we have empty slots where there should be elements and I was wondering if I’m just tripping or if this problem is unsolvable?
Presumably the bottom right $0$ is actually a $2 times 2$ matrix of $0$, i.e. $$A = left[matrix{0 & 3 & 4cr 3 & 0 & 0cr 4 & 0 & 0cr} right]$$
Answered by Robert Israel on November 14, 2021
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