Intro to Logic HW1

# Intro to Logic HW1 - HW#1 Tuesday, July 10, 2007 2:33 PM 1....

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True i. Every sound argument has true premises. a. False i. Every valid argument has a true conclusion. b. False i. If an argument is unsound then it must have a false conclusion. c. True i. If a valid argument has a false conclusion, then at least one of the premises must be false. d. True i. If a valid argument has at least one false premise, then the conclusion must be false. e. For each of the following statements say whether it is true or false: 1. Is the argument factually correct ? Is the argument valid ? Is the argument sound ? Some lizards are reptiles F a. Some reptiles are cold blooded F / Some lizards are cold blooded F Not factually correct (All lizards are reptiles and all reptiles are cold blooded). Not valid (see diagram). Not sound (not valid and not factually correct). All cats are pets F b. All pets are animals F (Pet rock) / All cats are animals T Not factually correct. Valid. Not sound. All men are bachelors F c. No bachelors are fathers F / Some men are fathers T Not factually correct.

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## This homework help was uploaded on 04/07/2008 for the course PHILOSOPHY 201 taught by Professor Morgan during the Spring '08 term at Rutgers.

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Intro to Logic HW1 - HW#1 Tuesday, July 10, 2007 2:33 PM 1....

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