The answers to exercises marked [BB] can he found in the Back of the Book.
Which of the following conditions imply that B = Cl In each case, either prove or give a counterexample.
(a) [BB] A∪B = A∪C
(b) A∩B = A∩C
(c) A ⊞ B = A ⊞ C
(d) A× B = A×C
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