An Online Resource for Logic Teachers and Students of Logic

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Square of Opposition Relations

Select from the options the change from the original statement that uses the relation and assumes the truth value indicated, and then then check the box that indicates whether the new statement is true (T), false (F), or undetermined (U).
Example: All D are G (T, contradiction)
Answer: Some D are not G (F)

Choose two answers

1 / 20

No Z are W (F, subimplication)

2 / 20

All M are N (F, subimplication)

3 / 20

Some C are not W (F, subcontrariety)

4 / 20

All O are I (T, contrariety)

5 / 20

Some R are not U (T, contradiction)

6 / 20

Some Y are W (T, superimplication)

7 / 20

Some J are E (T, subcontrariety)

8 / 20

No A are B (F, contrariety)

9 / 20

Some L are not M (F, contradiction)

10 / 20

All N are G (T, contradiction)

11 / 20

Some Z are V (F, subcontrariety)

12 / 20

All M are D (F, contrariety)

13 / 20

Some N are not M (T, superimplication)

14 / 20

No L are F (T, subimplication)

15 / 20

Some R are E (F, superimplication)

16 / 20

All K are J (T, subimplication)

17 / 20

All P are Y (F, subimplication)

18 / 20

Some J are not U (T, subcontrariety)

19 / 20

No H are C (T, contrariety)

Choose 2 answers.

20 / 20

Some A are B (F, contradiction)

Your score is

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