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