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Georgio on February 14, 2020

Sufficient & Necessary setup

Hi, this might be stupid or obvious but for the S&A questions do we setup the conditions and the contrapositive condition only when we see the terminology as shown in the video? Is there also any strategy to memorizing these words with what condition goes to each one?

1 Reply

Shunhe on February 14, 2020

Hi @Georgio1997,

Thanks for the question! It’s definitely not a stupid or obvious question; knowing when and when not to diagram is always a tough question. I would definitely say that the logical terminology is a huge indication that one should diagram, though you won’t be diagramming every time you see the word “if.” It’s really up to you—I like to diagram when those words are present, and when there are definitely logical connections being made between sentences. In general, the more complex a stimulus is, the more likely I am to diagram it to help myself keep track of the argument. The contrapositive you don’t always need to write out as much, though it is helpful for more complicated ones. Definitely at least keep it in the back of your mind, though. If you’re given A —> B, just watch out for ~B anywhere because that would trigger the contrapositive. There’s not really a strategy, though some of them are intuitive—“if” is pretty intuitive, and “only if” requires more thought but makes more sense. Just remember that those are the opposite. “Unless” is a bit harder, so I’ve just memorized that X unless Y means ~Y —> X. Hope this helps! Feel free to ask any other questions you might have.