12.5: Glossary
- Page ID
- 22038
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- class logic
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The logic developed by Aristotle that turns on the relationships among classes of things, especially the classes referred to by the subjects and predicates of sentences whose verb is a form of "to be."
- complement
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The complement of a class is all the things not in the class.
- counterexample to an argument
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A state of affairs, real or imagined, in which the premises of the argument turn out to be true and the conclusion turns out to be false. Valid arguments have no counterexamples.
- formally valid
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Deductively valid because of its logical form.
- Venn-Euler diagram
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Diagram representing class inclusion and class membership relationships.
- Venn-Euler diagram method
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A method of determining the validity of arguments in class logic by using diagrams in order to produce a counterexample to the argument, if one exists.