Find the difference between two sets, namely ${\frac{7}{\sqrt{2}}, -4, \frac{16}{\sqrt{5}}, -\frac{11}{2}, -1} \setminus {9, \frac{16}{\sqrt{5}}, -\frac{11}{2}, \frac{7}{\sqrt{2}}, -1}$.
Answer:
${-4}$
{'source': 'AMPS', 'file': 'amps/mathematica/counting_and_statistics/set_difference/49319.txt'}