Prove { {a}, {a,b} } = { {c}, {c,d} } if and only if a=b and c=d. I'm wondering how to proceed. I'm not even sure what exactly am I trying to prove
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Originally Posted by TitaniumX Prove { {a}, {a,b} } = { {c}, {c,d} } if and only if a=b and c=d. I'm wondering how to proceed. I'm not even sure what exactly am I trying to prove For sets A,B the definition tells us that , so: , and so . But contains one single element so this set cannot be equal to a set containing two elements, and thus . Take it from here. Tonio
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