252.Validity+and+Soundness+PS.2011.01.26

252.Validity+and+Soundness+PS.2011.01.26 - Validity and...

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Validity and Soundness Phil 252 Validity and Soundness: Definitions Validity: An argument is valid if and only if it’s impossible for the argument’s premises to be true while its conclusion is false. (iff the truth of the premises guarantee the truth of the conclusion) Soundness: An argument is sound if and only if (a) it’s valid, and (b) its premises are all true. Some important things to notice: There are a lot of valid arguments for false conclusions. There are a lot of valid arguments with wildly false premises. There are a lot of invalid arguments with true premises and true conclusions. There are a lot of unsound arguments with true conclusions. There are a lot of valid (and even sound) arguments that aren’t any good for convincing people of the conclusion. If an argument is sound, then its conclusion is true. Exercises: I. Consider the following arguments: A. 1. All bears live in Wisconsin. 2. All bears are mammals.
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252.Validity+and+Soundness+PS.2011.01.26 - Validity and...

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