Categorical Syllogisms
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Here’s the exciting conclusion of section 7.3, covering the final two rules of validity and two handy corollaries that make it easier (and faster) to recognize the validity (or invalidity) of syllogisms that rely on particular premises.
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In this lecture, I tacitly acknowledge that it was insane for the author of our text, whoever he was, to put all five rules of validity into a single section of the text. We’ll take section 7.3 in two parts, and in this part I cover the first three rules of validity, which all deal
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We’ve learned the parts of the syllogism, but how do they work together to help us expand our knowledge?
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We have covered the first act of the mind (simple apprehension) and the second act of the mind (judgment). With chapter 7, we begin to study the third act of the mind: inference. And we begin with the classic form of deductive argument, the categorical syllogism.
Logic Lectures 