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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
