I request some help, please, but only from those who are good at maths.
You are given the above matrix, and the "crowd"(really, have no idea what's the term in english) "M" composed from A to the k matrix(es?).
The problem asks how many elements M has.
I don't know how to solve the problem, so I was just guessing it might be infinity, since dividing pi with a value that gets higher and higher, you'll only get values that get closer and closer to 0( this is not a limit so I'm not discussing about dividing a value to infinity, which is 0). That means that every number is valid. Whatever, not that I am so sure about this part anyway.
Things get complicated when I see that k belongs to Z, and when trying to visualize matrix(es?) raised to a negative power(sincerely I think I am awfully failing at math at this point) it makes my mind explode.
But the problem correct answer is 2n, and I don't know why :.
Can someone explain to me ?