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Homework Help: Proving DeMorgan's Second Rule

  1. Jan 11, 2012 #1
    1. The problem statement, all variables and given/known data
    Hello, i proved the first demorgan's rule and using that i can easily proof the second one, but i tried to prove it as how i proved the first one. I would like to know what i did is correct, i feel i what i did might not be correct.

    2. Relevant equations

    (A [itex]\cap[/itex] B)c = Ac [itex]\cup[/itex] Bc

    proving through the fact that if;

    then following two should be satisfiable:
    A[itex]\subset[/itex]B and B[itex]\subset[/itex]A

    3. The attempt at a solution
  2. jcsd
  3. Jan 12, 2012 #2
    Seems correct!!
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