Question

Find what $p \to \sim q$ can also be written as:
A. $p \to q$
B. $\left( { \sim p} \right) \vee \left( { \sim q} \right)$
C. $q \to q$
D. $\sim q \to \sim p$

Answer 1

Hint- Here, we will be using the theorem of propositional logic because of the given statement.

According to the theorem of propositional logic, $p$ implies $q$ is equivalent to not $p$ or q
i.e., $p \to q \equiv \left( { \sim p} \right) \vee q$
Now let us replace $q$ by not $q$ ($\sim q$) then the above compound statement becomes
$p \to \sim q \equiv \left( { \sim p} \right) \vee \left( { \sim q} \right)$
From the above compound statement, we can say that $p$ implies not $q$ ($\sim q$) is equivalent to not $p$ ($\sim p$) or not $q$ ($\sim q$).
Therefore, option B is correct.

Note- In these types of problems, the given statement is observed and an appropriate theorem is used which will give a compound statement where the given statement is equivalent to another statement.