Logic: A Complete Introduction: Teach Yourself (Complete Introductions) by Siu-Fan Lee

Author:Siu-Fan Lee [Lee, Siu-Fan]
Language: eng
Format: azw3, epub, pdf
Tags: A Complete Introduction
Publisher: Hodder & Stoughton
Published: 2017-01-11T16:00:00+00:00

Spotlight: Only 15 valid argument forms of categorical syllogism!

Exercise 4.5: Testing validity using the rule method

Rewrite the following argument forms in standard forms. Identify the distributed terms. Then determine their validity by explaining which rules are broken, if any.

1 All A is B. All A is C. Therefore, all B is C.

2 Some A is not C. Some C is not B. Therefore, some A is not B.

3 No B is C. All A is B. Therefore, some C is not A.

4 All B is C. No A is C. Therefore, no B is A.

5 Some A is C. All B is C. Therefore, some A is B.

6 All A is C. All B is C. Therefore, some A is B.

7 All C is B. Some A is C. Therefore, no A is B.

8 All C is A. All B is A. Therefore, some C is not B.

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