Given a set of matrices
$M = \left\{\begin{bmatrix}1&a\\0&3\end{bmatrix} \mid a \in \mathbb R\right\},$
what does the notation $A_a^n, n \in \mathbb N$ mean?
Given a set of matrices
$M = \left\{\begin{bmatrix}1&a\\0&3\end{bmatrix} \mid a \in \mathbb R\right\},$
what does the notation $A_a^n, n \in \mathbb N$ mean?
$A_a$ seems to be a shorthand for a typical matrix in $M$. Then $A_a^n$ is the $n$-th power of $A_a$.