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Math Help - i am stuck

  1. #1
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    i am stuck

    The following logical statement I need help proving (with a formal proof), WITHOUT using DeMorgan's. For some reason, I am unable to do so, and any help would be greatly appreciated!

    ~(P.Q) = (~P.~Q)
    and
    ~(PvQ) = (~P.~Q)
    (= is the tribar and . is the dot)

    (the sooner the better! thanks for any help at all!)
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