Thinking Mathematically (6th Edition)

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

Chapter 3 - Logic - 3.4 Truth Tables for the Conditional and the Biconditional - Exercise Set 3.4 - Page 160: 79

Answer

The truth table is as follows: And the given compound statement is false when is false and is true

Work Step by Step

The given compound statement can be written in simple statements as\[p,q\]. Here, \[p,q\]represent two simple statements. \[\begin{align} & p:\ \text{Loving}\ \text{a}\ \text{person}\text{.} \\ & q:\ \text{Marrying}\ \text{a}\ \text{person}\text{.} \\ \end{align}\] The given statement can be written in the symbolic form as \[\left( q\to p \right)\wedge \left( \sim p\to \sim q \right)\]. The truth table for \[\left( q\to p \right)\wedge \left( \sim p\to \sim q \right)\] can be deduced by first finding the negation of \[p,q\]as\[\sim p,\sim q\].Now find the following conditional\[\left( q\to p \right)\], it is true when the former statement is true and the latter is false. In rest, all other cases it is true. Similarly, find\[\left( \sim p\to \sim q \right)\].Now, as these statements\[\left( q\to p \right)\], \[\left( \sim p\to \sim q \right)\] are joined by conjunction \[\wedge \] which is true only when both simple statements are true. To construct the truth table draw the table having \[5\ \text{rows}\ \text{and}\ 7\ \text{columns}\] in which the elements of the first row are\[p,q,\sim p,\sim q,\left( q\to p \right),\left( \sim p\to \sim q \right),\left( q\to p \right)\wedge \left( \sim p\to \sim q \right)\].
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