Thinking Mathematically (6th Edition)

RECALL: The negation of $p \longrightarrow q$ is $p \wedge \neg q$. The given statement has: $p$: It is cold. $q$: We do not use the pool. Thus, $\neg q$: We use the pool. Therefore, the negation of the given conditional statement is: "It is cold and we are using the pool."