Logic
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Some people “get” analogies easily; others don’t–and the people who “get” them often don’t know where to start in explaining them to the others. So here’s a basic explanation of analogies: why we use them, how they work, and how they sometimes fail.
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I generalize a lot, and so do most people I know. Probably everyone generalizes a lot. So it makes sense for us to examine generalizations in some detail.
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Most of our attention so far has been on deductive reasoning. It’s time now to learn about inductive reasoning, which is indispensable for sound thinking generally and is especially important in the field of science.
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Many people call any hard practical question a dilemma, but actually a dilemma is a very well-defined type of advanced deductive argument. Here’s what you need to know about them.
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Now that we know about enthymemes–arguments with fewer than two lines–let’s learn how to string many syllogisms together into polysyllogisms.
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Time to leave the shallow end of the pool! With enthymemes–one of the most effective forms of argument, according to Aristotle–we begin our study of advanced deductive arguments.
Logic Lectures 