validity

# validity - Testing Arguments for Validity and Soundness...

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Testing Arguments for Validity and Soundness Philosophy 12A August 27, 2008 1 Visualizing the Procedure for Validity/Soundness Testing Figure 1 provides a series of questions (and their possible answers), which will help us to determine whether an argument is valid (or sound). In the next section, I will apply this method to several arguments from our ±rst (8/27) lecture. Is it possible that both ( i ) all of A ’s premises are true, and ( ii ) A ’s conclusion is false? YES A is in valid (absolutely). A is un sound. NO A is valid (absolutely). Are all of A ’s premises actually true ? YES A is sound . NO A is un sound (but valid). Figure 1: Testing an argument A for (absolute) validity and soundness. 2 Applying the Test to Some Examples 2.1 Example #1 — An “Easy” Valid Argument Recall our ±rst example from last time: A 1 : Dr. Ruth is a man. If Dr. Ruth is a man, then Dr. Ruth is 10 feet tall. Dr. Ruth is 10 feet tall. The method depicted visually in Figure 1 leads to the following sequence of questions (and answers) about argument A 1 . Q

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## This note was uploaded on 09/23/2009 for the course PHIL 12A taught by Professor Fitelson during the Spring '08 term at Berkeley.

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validity - Testing Arguments for Validity and Soundness...

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