exercise17answers - Exercise 17 Answers Philosophy...

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Exercise 17 Answers Philosophy 102 (Maher) Spring 2009 1. There is more than one way of putting these into standard form, and different ways of doing it can change the fallacies committed by invalid arguments; however, this cannot change whether the argument is valid or not. (a) All non- S are non- W . All V are W . All V are S . All W are S . All V are W . All V are S . (contraposition) Valid (AAA–1). (b) Some I are C . All C are non- P . Some non- I are not P . Some I are C . All C are non- P . Some non- P are not I . (contraposition) (Since subject and predicate can be interchanged, as here, you can’t be sure in advance which premise should be listed first; you will sometimes need to change the order of the premises after you reduce the number of terms.) (c) All W are R . All non- R are non- S . No non- W are S . All W are R . All S are R . All S are W . (contraposition)
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exercise17answers - Exercise 17 Answers Philosophy...

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