Difficult: The thing I found most difficult were compound statements. There are a lot of theorems to memorize, and it's sometimes difficult to remember what is legal and what is not. But, I guess it all comes back to definitions of the statements. For example, I know it's proven, but it doesn't just "click" to instantly say that P => Q and (~P) V Q are logically equivalent. I have to stop, use a truth table, and then use examples to help more fully understand the concept. However, truth tables seem to save the day every time!! They are so handy and make a lot of sense! So hopefully we can keep using those.
Interesting: This unit is all together really interesting, I love studying logic, it's so applicable to anything! We were talking in my Honors class about great questions, and with great questions requires great logic. You have to make sure that any argument you make, especially in rhetoric or persuasive writing, is logically solid to avoid fallacies.
We discussed some of these concepts in geometry, but not as in depth. All I remember from then is that if the statement is true, than so is it's contrapositive. In addition, if it's converse is true, then so is it's inverse (or visa versa).
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