Use the element method for proving a set equals the empty set to prove the statement. Assume all sets are subsets of a universal set U.
1. For all sets A and B, if B C Aͨthen A ∩ B = Ø.
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Well, if crocodiles are not mammals, then there are no animal that is both a crocodile and a mammal. This is just to give an intuition. You can imagine that B is the set of crocodiles, A is the set of mammals, and start reasoning.
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