It is easy to get confused by the terminology. Part of the problem is that the subject is very dense and not the usual way of thinking. It uses the minimal amount of language to make the point and avoids the opposite problem of being verbose but therefore isn't too helpful if you don't understand the explanation the way it is written. It works best with someone to lead you through. In my personal opinion it could have used a larger example section and does not do a good job of teaching how to interpret from English language sentences into a symbolized logic statements. It covers truth-functional, quantificational, modal, truth tables and trees, direct proofs, indirect proofs, and conditional proofs. Budget lots of time; at least 1hr class to 3hr study. Pound yourself to get the truth-functional rock solid or you will lose it further on.
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