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inclassassign - I n- class Exercise: Formal Validity...

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Unformatted text preview: I n- class Exercise: Formal Validity 4/17/2009 Phil. 110 - Olsen For each of the following arguments, provide substitutions for the statements to render each argument in standard form, and then name the argument form. Argument All Americans are honest. Bernard Madoff is an American. Standard Form All S are P. Argument Name VF3 X is an S. Therefore, Bernard Madoff is honest. Therefore, X is P. If Tuesday is the 14th, then Friday must be the 17th. Tuesday is the 14th. If P, then Q. MP P. Therefore, Friday is the 17th. Therefore, Q. If it had rained this morning, then the grass would still be wet. If P, then Q. But the grass is not wet. MT Not-Q. Therefore, it did not rain this morning. Therefore, not-P. If an act is done out of self-interest, then it cannot be praiseworthy. If P, then Q. If it cannot be praiseworthy, then it is not moral. HS If Q, then R. Therefore, if P then R. Thus, if an act is done out of selfinterest it is not moral. All P are S. All professors wear sweater vests. X is not-S. Mike does not wear sweater vests. Thus, X is not-P. Therefore, Mike is not a professor. VF4 I n- class Exercise: Formal Validity 4/17/2009 P. Murder is wrong. If murder is wrong, then abortion is wrong. Phil. 110 - Olsen MP If P, then Q. Q. Abortion is wrong. CP If an object is red, then it has color. If it does not have color, then it is not red. If P, then Q. Thus, if not-Q, then not-P. If an object is not red, then it does not have color. CP If it does have color, then it is red. If there is no God or moral laws to live by, then there is no use for ethics. (A or not B) Not C There is no God or moral laws to live by. MP Therefore, not-C. A or not B Therefore, there is no use for ethics. MT If God is good, then if bad things happen in the world, then they must not come from God. It is not the case that if bad things happen in the world, then they must not come from God. Therefore, God is not good. C (A B) Not (A B) Therefore, not C. ...
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This note was uploaded on 09/16/2011 for the course PHIL 110 taught by Professor Kay during the Spring '07 term at S.F. State.

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inclassassign - I n- class Exercise: Formal Validity...

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