30 - IMPOSSIBLE iv. True premises & logically true yet...

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Tricks to Validity 9/30/10 I. Review a. An argument is valid if and only is it is impossible for the premises to be true and the conclusion false. b. A test for validity: if the premises were true, would the conclusion have to be true as well? II. Logically True Propositions a. A proposition is logically true if and only is it is impossible for the proposition to be false i. Example: either Cynthia will get a job or she will not get a job III. Validity and Logically True Conclusion a. Arguments can have logically true conclusion i. Porky pig is a flamboyant nudist, therefore either Obama will win the election or he wont. THIS IS VALID b. Any argument with a logically true conclusion is valid c. Examples: i. iii. False premise & logically true yet False Conclusion-
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Unformatted text preview: IMPOSSIBLE iv. True premises & logically true yet false conclusion-IMPOSSIBLE IV. Logically Inconsistent Propositions a. A set of propositions is logically inconsistent if and only is it is impossible for all the member of the set to be true at the same time V. Validity and Logically Inconsistent Premises a. A set of premises can be logically inconsistent b. Any argument with inconsistent premises is valid c. Examples: i. Inconsistent yet all true premises & true conclusion- IMPOSSIBLE ii. Inconsistent premises & true conclusion- VALID iii. Inconsistent premises & false conclusion- VALID iv. Inconsistent yet all true premises & false conclusion- IMPOSSIBLE MAIN POINTS • Any argument with a logically true conclusion is valid • Any argument with logically inconsistent premises is valid...
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This note was uploaded on 03/03/2011 for the course PHIL 100 taught by Professor Forte during the Fall '08 term at Bridgewater State University.

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30 - IMPOSSIBLE iv. True premises & logically true yet...

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