Subcontraries and Subalterns

Question 1

What’s the Rule of Subcontraries?

Answer 1

Two statements are subcontrary of they are both particular and differ in quality. I and O are subcontrary.

Question 2

What’s the Third Law of Opposition?

Answer 2

Subcontraries can be true at the same time but not false at the same time.

Question 3

What’s the Rule of Subalterns?

Answer 3

Two statements are subalternate if they have the same quality but differ in quantity.

Question 4

What’s the Fourth Law of Opposition?

Answer 4

With subalterns, if the particular is false the universal is false and if the universal is true than the particular is true.

Question 5

What’s the Square of Opposition?

Answer 5

It is a drawn square with one of the four categorical statements in each corner, and it is used to represent what is contradictory/subalternate/etc…