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Math Help - Discrete Math Help

  1. #1
    Newbie
    Joined
    Oct 2009
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    21

    Discrete Math Help

    here is another homework problem I am stuck on...
    Let P(x.y) stand for the proposition that person x plays sport y. For example, P(babe Ruth, Baseball) is true.

    Express symbolically, using P and the descriptor notation the set of sports exactly one of you and me plays (i.e., either you play it and I don't or I play it and you don't). Use my initials (JG) and your initials where needed in your expression.
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  2. #2
    Super Member Deadstar's Avatar
    Joined
    Oct 2007
    Posts
    722
    This may not be what your after but I'll give it a hoof.

    (A \ B) is defined as A not B.

    I.e. IF A was the set {1,2,3,4,5} and B was the set {2,3,4} then (A \ B) would be {1,5} since neither are in B.

    So if we do this with your problem we get...

    (Deadstar \ JG) means Deadstar but not JG...

    So ((Deadstar \ JG), Football) means...Deadstar likes Football and JG doesn't.
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