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Unformatted text preview: Can you think of a case that would demonstrate that the second argument is invalid? Sound and Unsound arguments: An argument is said to be sound if it is valid and all of its premises are true . Consider the following arguments: (1) All men are mortal. Socrates is a man. So, Socrates is mortal. (2) All rich actors are good actors. Brad Pitt is a rich actor. So, Brad Pitt must be a good actor. What about this one: (3) All rich actors are good actors. Brad Pitt is a good actor. So, Brad Pitt is a rich actor. Regardless of the truth value of the premises and conclusion, all invalid arguments are automatically unsound . A note about Fitch format for arguments All men are mortal. Socrates is a man. So, Socrates is mortal. When we begin to analyze arguments we will use the Fitch format to display each argument. In Fitch format, the premises are listed before the horizontal line (called the Fitch bar) and the conclusion is listed below the line....
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- Fall '06