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The Categorical Converter The Categorial Converter is a visual representation of all possible logical relationships between individual categorical propositions. It may be used to test the validity of an inference from one proposition to another. In other words, the Categorical Converter represents all possible inferences using the rules of: Contradiction Contrary Subcontrary Subalternation Superalternation Obversion Conversion Transposition From here, you may view the Categorical Converter. You may also learn how to use it, and finally, learn how it was constructed. 10 August 1996 For Educators Stephen Downes Guide to the Logical Fallacies Copyright © Stephen Downes, 1995-2001 stephen.downes@ualberta.ca