Apologies if this is a very basic question, but I came across a somewhat confusing notation and am not familiar with it. I am reading an article that contains the following notation in some of its equations:
$\sum_n a_n Q(x)^n $
where $Q(x)$ are the elements of a matrix.
My question: What does $Q(x)^n$ here mean? If we know the numerical value of $Q(x)$, then does $Q(x)^n$ simply mean "the value of $Q(x)$ raised to the power $n$"? [If it were indeed the $n$-th power, I personally would have expected it to be written as $Q^n(x)$.] Or could there be some other meaning to this?
I do note, there are similar questions answered on StackExchange, such as Conventions for function notation and Notation of a function raised to a power , but they do not refer to matrix elements; hence this post.