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Homepage > Logic > Categorical Propositions > Square of Opposition |
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The Square of Opposition
Contraries (A and E): cannot both be true but could both be false. Subcontraries (I and O): cannot both be false but could both be true. Contradictories (A and O; E and I): have opposite truth values. Subalternation (A and I; E and O): the superaltern implies the subaltern.
Details of the Square of Opposition are provided in the lecture notes.
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