After a day, I made a parallel thread at mathhelpforum.com,
http://mathhelpforum.com/advanced-math-topics/212270-my-difficulties-text-_how-prove-structured-approach-2-ed_.html.
I eventually found a solution while interacting with that thread, but since Physics Forums is broader in scope and...
I'm creating this thread for any major difficulties I come across in How to Prove It: A Structured Approach, 2nd edition by Daniel J. Velleman. This is a self-study (with any assistance if I can get it).
Homework Statement
The problem is to analyze the logical form of the given statement...