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categorical propositions universal affirmative universal negative particular affirmative particular negative syllogism references external likns general philosophy sources credits logic is the study of correct, or valid inferences. aristotle 's logical system is based upon a form of argument called
"all," "some," "is," and "is not," to link "terms," which refer to some set, class or kind. this reference to categories, sets, or classes, is why they are called categorical propositions. an example of a categorical proposition is "all whales are mammals." aristotelian logic regards four basic types...
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