Philosophy_110_Chp10[1]

Philosophy_110_Chp10[1] - Counterexamples to Statements...

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4/9/2009 1 Chapter 10 More on Evaluating Premises Counterexamples to Statements Often, sweeping statements are made in the course of debates and poorly constructed arguments. For example, “All Roman Catholics are against abortion.” All we need to do to discredit such a statement is to think of an instance that is not true. Example: “No women are lawyers.” Gloria Allred is a woman and a lawyer. “No men have walked on the moon.” Neil Armstrong is a man and has walked on the moon. A priori versus A posteriori A priori We know the truth of a premise through the meanings of the words involved. These statements are true or false before any empirical investigation. Ex: “All bachelors are unmarried men.” A priori true Ex:“There are at least ten atheists who believe in God.” A priori false A posteriori The truth of such statements is known only after investigation “Nixon is younger than Clinton.” A posteriori false “75% of the U.S. population is Christian.” A posteriori true “75% of automobile drivers are better than average automobile drivers.” A priori false
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Philosophy_110_Chp10[1] - Counterexamples to Statements...

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