Lesson 13-18

Question 1

Square of opposition

Answer 1

Diagram of the basic relationships between categorical statements with the same subject and predicate

Question 2

A* statement

Answer 2

Universal affirmative statement
All S is P
(top left corner of the square of opposition)

Question 3

E* statements

Answer 3

Universal negatives
No S is P
(Top left of the square of opposition)

Question 4

I* statement

Answer 4

Particular affirmative
Some S is P
(Bottom left corner of the square of opposition)

Question 5

O* statement

Answer 5

Particular negative
Some S is not P
(Bottom right hand corner of the square opposition)

Question 6

Contradiction

Answer 6

The relationship between A* and O* statements, and I* and E* statements
(if one is true the other must be false)

Question 7

Contrariety (contrary relationship)

Answer 7

They can both be false but not both be true
(Exists between universal statement)

Question 8

Subcontrariety

Answer 8

Both statements can be true but both can’t both be false
(Particular statements)

Question 9

Subimplication

Answer 9

The relationship that exists from universal statements, (A or E) to the particular statements(I or O)of the same quality
(If the universal is true, then the particular statement must also be true)

Question 10

Superimplication

Answer 10

The relationship that exists from particular statements, (I or O) to the universal statements (A or E) of the same quality