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Math Help - Please tell me why?

  1. #1
    Newbie
    Joined
    May 2007
    Posts
    21

    Please tell me why?

    The following is the question, working and answer, but could you tell me the reason of the lines with *??

    ((BA) A)
    =(BA) A
    *=(AB)(AA)
    *=(AB)U
    *=AB


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  2. #2
    Member
    Joined
    Jan 2009
    Posts
    94
    =(B∩A) ∪A
    Distributive property, similar to 4 * (6 + 3) = 4*6 + 4*3
    *=(A∪B)∩(A∪A)

    (A∪A) is the universal set: U

    *=(A∪B)∩U

    C∩U = C is true for any set C.

    *=A∪B


    -O
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