If you are studying Intermediate Logic, Unit Two, and you are having trouble writing formal proofs of validity (especially if you are in either Lesson 15 or 17), here are my last two suggestions (after reading THIS and THIS):
- Work together with someone who can help you. If you do not have a study partner, shoot me a question on my Facebook logic page. I would be happy to answer specific questions about solving any of the proofs. Or give me a call during work hours. My phone number is on my personal Facebook page. I’m serious.
- If you and a friend finally get through the proofs in the exercise after a lot of struggle and effort together, then do this. Take a break, go have lunch. Then return to the exercise, and re-do it, looking back at the answers if you need to. Repeat until you can complete all of the proofs without looking at the answers.
Logicians hate this trick because it lets you solve proofs without effort!
Sorry. No magic pill. No “Logicians hate this trick because it lets you solve proofs without effort!” Just hard work and practice.