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Philosophy 103:Introduction to Logic
Test on Categorical Propositions
Part I: The Square of Opposition

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RETURN TO CONTENTS OF TEST ON CATEGORICAL PROPOSITIONS

Part I: The Square of Opposition (30 points). For all the problems in this section. assume that the given proposition is true, perform the required inference, and state the resultant proposition and its truth value.). 

Example: What is the subaltern of "All stoics are pawns"?
Answer:  Some stoics are pawns. True.


1. What is the contrary of "All joggers are escapists"?

 

2. What is the contradictory of "Some tillers are not Snappers"?

 

3. What is the subaltern of "No logic teachers are exciting persons"?

 

4. What is the subaltern of "No disco music is acid rock"?

 

5. What is the superaltern of "Some funny cars are dragsters"?

 

6. What is the subcontrary of "Some soft drinks are not nutritional goods"?

 

7. What is the contrary of "No joggers are depressed persons"?

 

8. What is the subaltern of "All stereos are hi-fi's"?

 

9. What is the superaltern of "Some balloons are not high-fliers"?

 

10. What is the subcontrary of "Some fruits are not foods"

Be sure you have given the truth values for the above questions.


CONTINUE TO PART II: FURTHER IMMEDIATE INFERENCES

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09.25.09        2001-9   OPL


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