Both your methods are incorrect!
We need to prove:
, which is true (given).
, is given, along with the fact that m and n are natural numbers.
I have to prove:
Here's what I have:
what!? I proved the opposite of what I needed to.
I see that I can do:
which is the desired result, but what am I missing in the first part? why can I prove it is both greater than and less than 2?