Categorical Argument Patterns Flashcards
(11 cards)
1
Q
A statement
A
All S are P
2
Q
E statement
A
No S are P
3
Q
I statement
A
Some S are P
4
Q
O statement
A
Some S are not P
5
Q
Contrary
A
At least one of A and E must be false
6
Q
Contradictory
A
One must be true, one false (between A and O, and E and I)
7
Q
Subalternation
A
If a universal claim is true, its corresponding particular must also be true
8
Q
Subcontrary
A
At least one of I and O must be true
9
Q
Conversion
A
Switch subject and predicate of E and I statements
10
Q
Obversion
A
Replace predicate with its complement and switch claim quality
11
Q
Contraposition
A
Switch subject and predicate of A and O statement and replace subject and predicate with their complements
