Is there a proof out there that states that this is true?
Sorry, I should have worded my question more specifically.
I know that there is a proof (as seen by the hint), but I'm having difficulty solving it on my own. I'm trying to review for a test, so I'm wondering if this is a popular enough proof that I can just study it on the internet.
By the way, thanks for replying to my last two threads. I'm in dire need of help.