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Math Help - conditional proof

  1. #1
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    conditional proof

    Use a conditional proof to prove the following argument:

    Only a fool would lie about one of Elaine's sorority sisters to her. A classmate of
    Elaine's lied about Joanne to her. Therefore, if none of Elaine's classmates are fools, then Joanne is not a sorority sister of Elaine. (F(x) = x is a fool; L(x,y,z) = x lies
    about y to z ; C(x,y) = x is a classmate of y; S(x,y) = x is a sorority sister of y;
    e = Elaine ; j = Joanne)


    Any help? Thanks!
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  2. #2
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    Quote Originally Posted by LCopper2010 View Post
    Use a conditional proof to prove the following argument:

    Only a fool would lie about one of Elaine's sorority sisters to her. A classmate of
    Elaine's lied about Joanne to her. Therefore, if none of Elaine's classmates are fools, then Joanne is not a sorority sister of Elaine. (F(x) = x is a fool; L(x,y,z) = x lies
    about y to z ; C(x,y) = x is a classmate of y; S(x,y) = x is a sorority sister of y;
    e = Elaine ; j = Joanne)


    Any help? Thanks!
    Have you tried anything for that problem??
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