Exercise 4.2 (page 59) is unclear: Prove De Morgans law for sets (A∩B)^C ? A^C∪B^C. "C" is never defined, and as the preceding exercise is on power sets, this suggests that "x^C" should be read as a power set with the set C, not as the set complement.
Exercise 4.2 (page 59) is unclear: Prove De Morgans law for sets (A∩B)^C ? A^C∪B^C. "C" is never defined, and as the preceding exercise is on power sets, this suggests that "x^C" should be read as a power set with the set C, not as the set complement.