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Math Help - please help..

  1. #1
    Newbie
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    Aug 2006
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    please help..

    Prove each of the following statements about sets A,B and C.
    (i)AnB=BnA
    (ii)(AnB)nC=An(BnC)
    etc
    Do you use venndiagrams to prove?
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  2. #2
    Senior Member OReilly's Avatar
    Joined
    Mar 2006
    Posts
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    Quote Originally Posted by kodirl
    Prove each of the following statements about sets A,B and C.
    (i)AnB=BnA
    (ii)(AnB)nC=An(BnC)
    etc
    Do you use venndiagrams to prove?
    You can use tautology to prove it.

    For example for (i):

    A \cap B = B \cap A if and only if x \in A \wedge x \in B \Leftrightarrow x \in B \wedge x \in A
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