PHIL-125 Lecture 13: Major, Minor, Middle Terms

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The first contains the major and middle terms, so the final predicate in the conclusion. The second premise contains the minor and middle term, so the subject in the conclusion. You can find these, obviously, by looking at the conclusion. Four possible figures of order for the terms are as follows. The premises both have a letter from the mood, and as does the conclusion. So aoe, aio, etc, are all various forms of mood. Taking the above four figures of forms and combining them with the various kinds of mood (aeio) gives us 256 possibilities categorical syllogisms. If valid in the boolean interpretation, they are unconditionally valid. If valid in aristotelian interpretation only, subjected to a condition of existence, are invalid through the. Invalid for boolean and aristotelian because of existential fallacies or illicit logic vastly outnumber the valid forms. To identify the form, there are 4 steps.

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