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1RUNNING HEAD: OPPOSITIONSSquare of OppositionJulia SteuerWest Coast University
2OPPOSITIONS Square of Oppositions Categorical logic is the part of logic that is applied to classes of things. Logic is “the study and application of the rules of reasoning” (Moore & Parker, 2017). That would mean the categorical logic is the study and application of the rules of reasoning when dealing with classes of things. In categorical logic there are categorical propositions which is how we categorize claims made about relationships between two classes. The square of opposition makes clear the relationship these propositions have with each other. It shows very clearly in a visual geometric way which of the propositions contradict each other. It also shows contrary (A and E) claims and subcontrary (I and O) claims. Contrary claims are when “both can be false, but they cannot both be true” (Moore & Parker, 2017, p. 252). Subcontrary claims are when “they can both be true, but they cannot both be false” (Moore & Parker, 2017, p. 252). The square of opposition helps