HOMEWORK for Unit i, Lesson 4: The Square of Opposition

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Assessing Categorical Arguments for Validity: Immediate Inferences Edition

Directions: Use the Traditional Square of Opposition to check if the following one-premise arguments are valid or invalid.

1. Some cookie-eaters are cookie monsters. So it is false, that no cookie-eaters are cookie monsters.

2. It is false that some cookies are turnips. So, no cookies are turnips.

3. It is false that some cookies are not delicious. So, it is false that no cookies are delicious.

4. It is false that all cookies are metallic. So, it is true that some cookies are metallic.

5. Some cookies are not splurps. So, no cookies are splurps.

6. Some cookie monsters are cookie lovers. So, all cookie monsters are cookie lovers.

7. It is false that no dogs are cookie eaters; hence, it is false that all dogs are cookie eaters.