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Unformatted text preview: All men are mortal. All pigs are men. So, all men are pigs. o Notice that in the 1st argument, although it is not a good argument because it has a false premise, it is a valid argument. The conclusion does logically follow from those premises. That is, if someone believed the premises were true then, logically, they ought to accept the conclusion. o Notice that the 2nd argument is not a good argument because the conclusion does not follow from the premises. That is, it is not valid. However, the premises are true. o A good (sound) argument must have both true premises and be valid. R An argument that is valid & has true premises must have a true conclusion. This is because the conclusion logically follows from other ideas (the premises) which are true. R True Premises + Validity = True Conclusion...
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- Spring '11
- Logic, premises, Robert Redford