Homework Statement
If m\inZ and 2\leq n\in Z, then |[m]_n|=\frac{n}{(m,n)}
Homework Equations
Lagrange's Theorem
The Attempt at a Solution
I am confused simply because it seems like the problem might be missing something. We are asked to find the order of the congruence class m modulo n...
Yes, after thinking about it I came to the same conclusion. You can't put them in bijective correspondence because if you wanted to map the union onto X^\omega you could do so injectively by adding 0s but there's no way to make this mapping surjective.
I know that a countable union of countable sets is countable, and that a finite product of countable sets is countable, but even a countably infinite product of countable sets may not be countable.
Let X be a countable set. Then X^{n} is countable for each n \in N.
Now it should also be true...
Homework Statement
The problem is much bigger, but part of the proof I've written hinges on the assumption that for a \in \mathbb{R}, x_n converging to x, a^{x_n} converges to a^x
Homework Equations
n/a
The Attempt at a Solution
I have tried taking $\log_a$ of both sides but that only...