Philosophy 1230A/B Lecture 23: Lecture 23 DeductionInduction
25 Dec 2016
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Audio recording started: 9:31 am tuesday, november 15, 2016. Ask if there is a possibility that all premises are true and conclusion is false. If there is one such situation, the argument is invalid. Ex. if it"s raining there is such thing as santa clause, it is raining, therefore, there is such thing as santa clause. Every member of the tiny tin fan cub plays ukulele. Therefore: lorraine belongs to the tiny tim fan club. Therefore: fraiser must be taller than mr. crane2. Listening to loud music always ruins your hearing. Joe must have been listenining to loud music. Intuitive method is very limited as a way of establishing validity or invalidity. If you cook up counter example: shows invalidity. If you can"t counter: still could be invalid, you just can"t think of a counter. Solution: resort to the truth tables method ( and the short method) of searching for counterexamples. Truth tables: to check for validity or invalidity.
