Show that Theorem 8.37 is best possible in the following sense. a) There exist sets A, B
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a) There exist sets A, B in R such that (A U B)° ± A° ‹ƒ B".
c) There exist sets A, B in R such that Ï‘(A U B) ‰ Ï‘A U Ï‘B and Ï‘(A ˆ© B) ‰ Ï‘A U Ï‘B.
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ANB+ANB.
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