grandes-ecoles 2019 Q4

grandes-ecoles · France · centrale-maths2__psi Matrices Linear Transformation and Endomorphism Properties
We assume that $n = 2$. Let $u$ be an endomorphism of $E$ nilpotent of index $p \geqslant 2$.
Show that $\operatorname{Ker} u = \operatorname{Im} u$.
We assume that $n = 2$. Let $u$ be an endomorphism of $E$ nilpotent of index $p \geqslant 2$.

Show that $\operatorname{Ker} u = \operatorname{Im} u$.