Thinking Mathematically (6th Edition)

Published by Pearson
ISBN 10: 0321867327
ISBN 13: 978-0-32186-732-2

Chapter 3 - Logic - 3.7 Arguments and Truth Tables - Concept and Vocabulary Check - Page 190: 9

Answer

The statement: “The conclusion of a sound argument is true relative to the premises, but it is also true as a separate statement removed from the premises” is true.

Work Step by Step

A valid argument with true premises is called a sound argument. The conclusion of a sound argument is true relative to the premises, but it is also true as a separate statement removed from the premises. For example – The argument is If I’m tired, I’m edgy. If I’m edgy, I’m nasty. \[\therefore \]If I’m tired, I’m nasty. Use a letter to represent each simple statement in the argument. p: I’m tired. q: I’m edgy. r: I’m nasty. Express the premises and conclusion symbolically as, \[\frac{\begin{align} & p\to q \\ & q\to r \\ \end{align}}{\therefore p\to r}\ \ \ \ \ \frac{\begin{align} & \text{If Im tired, Im edgy}\text{.} \\ & \text{If Im edgy, Im nasty}\text{.} \\ \end{align}}{\therefore \text{If Im tired, Im nasty}\text{.}}\] This symbolic form of argument follows the standard form, valid argument, and Transitive Reasoning. \[\frac{\begin{align} & p\to q \\ & q\to r \\ \end{align}}{\therefore p\to r}\]
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