Below is a question comes from the book How to Prove It written by Daniel J. Velleman.
Let $P$ stand for the statement, “I will buy the pants” and $S$ for the statement “I will buy the shirt.” What English sentences are represented by the following expressions?
$\lnot(P \land \lnot S)$
The given answer is, “I won't buy the pants without the shirt.“ I don't understand the answer. Can someone explain? Or maybe the answer is wrong?