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28 Cards in this Set

  • Front
  • Back
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