grandes-ecoles 2018 Q34

grandes-ecoles · France · centrale-maths1__psi Matrices Matrix Algebra and Product Properties
Deduce that if $A \in H_i$ and $B \in H_j$, then $AB \in H_{i+j}$.
Deduce that if $A \in H_i$ and $B \in H_j$, then $AB \in H_{i+j}$.