Lotic notes 4.4

EXERCISE 4.4

I

1. No non-B are A --T

4. All non-B are A--F

7. Contraposition--U

10. Obversion--F

 

III

1. Invalid--illicit conversion

4. Invalid--illicit contraposition

7. Valid

10. Valid

13. Invalid--illicit conversion

16. Invalid--illicit contraposition

19. Valid

 

EXERCISE 4.5

 

III

1. All non-B are A--T

4. Some non-A are B--U

7. No non-A are B--F

10. Some non-A are not non-B -- T

14. Subalternation--U

16. Contradition--T

19. Contrary--U

 

IV

1. Valid

4. Invalid--illict contropostion

7. Valid

10. Invalid--illict contrary

13. Invalid--illicit subcontrary

 

EXERCISE 4.6

(use square, not Venn Diagram)

1. Valid, unsound

4. Valid, sound

7. Invalid, existential fallacy

10. Invalid, illicit subalternation

13. Valid, sound