square of opposition

Question 1

A statement

Answer 1

Universal affirmative

Question 2

E statement

Answer 2

Universal negative

Question 3

I statement

Answer 3

Particular affirmative

Question 4

O statement

Answer 4

Particular negative

Question 5

Contradiction

Answer 5

Both cannot be T or F; one is T and one is For

Question 6

Contrariety

Answer 6

Both cannot be T, but both can be false

Question 7

Subcontrariety

Answer 7

Both can be T, but both cannot be F

Question 8

Subimplication

Answer 8

I is implied by A

Question 9

Superimplication

Answer 9

Falsity of A is inferred from falsity of I