Lecture Notes - 061906 - Ex. The instructor is tall. The...

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Katie Kerr PHL 304 June 19, 2006 An argument that is valid does not necessarily have true premises. Arguments that are sound are both valid and have the same premises. Contraries and Contradictions Contraries cannot be true at the same time.  When talking about contraries, we  can always find a third alterative. Two propositions are contradictory , if when one is true, the other one must be  false. Two propositions are contrary  if they cannot be true at the same time.  
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Unformatted text preview: Ex. The instructor is tall. The instructor is not tall. (Contradiction) Ex. The instructor is tall. The instructor is short. (Contraries) Counterexamples p. 112-119 Propositional Ex. All Fs are G. There is something that is F but not G. P1 What is repulsive is morally wrong. P2 Homosexual sex is repulsive. C Homosexual sex is morally wrong. Counterexample: Throwing up is repulsive, but not morally wrong....
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Lecture Notes - 061906 - Ex. The instructor is tall. The...

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