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### 28 Cards in this Set

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 A proposition - All subject is predicate. - "Universal Affirmative" E proposition - No subject is predicate. - "Universal Negative" I proposition - Some subject is predicate. - "Particular Affirmative" O proposition - Some subject is not predicate. - "Particular Negative" Categorical Propositions Affirm or deny that some class "S" is included, in whole or part, in some other class "P". Distribution Table for Categorical Forms A - DU E - DD I - UU O - UD Contrary Propositions - Two universal propositions (with same subject & same predicate) that have different quality. - A and E Subcontrary Propositions - Two particular propositions (with same subject & same predicate) that have different quality (same quantity). - I and O Subaltern Propositions - A universal and particular proposition (with same subject & same predicate) that have different quantity (same quality). - A and I or E and O Contradictory Propositions - Two propositions (with same subject & same predicate) that have different quality AND different quantity. - A and O or E & I Square of Opposition: If A is true, then ... E - false I - true O - false Square of Opposition: If E is true, then ... A: false I: false O: true Square of Opposition: If I is true, then ... E: false A: undetermined O: undetermined Square of Opposition: If O is true, then ... A: false E: undetermined I: undetermined Square of Opposition: If A is false, then ... O: true E: undetermined I: undetermined Square of Opposition: If E is false, then ... I: true A: undetermined O: undetermined Square of Opposition: If I is false, then ... A: false E: true O: true Square of Opposition: If O is false, then ... A: true E: false I: true Given: A Form Contrary: ? E Form Given: A Form Contradictory: ? O Form Given: A Form Subaltern: ? I Form Given: A Form Subcontrary: ? Invalid Given: A Form Superaltern: ? Invalid Given: E Form Contrary: ? A Form Given: E Form Subaltern: ? O Form Given: E Form Contradictory: ? I Form Given: E Form Superaltern: ? Invalid Given: E Form Subcontrary: ? Invalid