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Math Help - Negation of x in A or B

  1. #1
    Junior Member
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    Sep 2009
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    Negation of x in A or B

    Hi all,

    if no means the negation of a condition.

    no(  x \in ( \mathbf{A} \cup \mathbf{B})) \Longleftrightarrow (x \not \in \mathbf{A}) \cap (x \not \in \mathbf{B})

    this is right, right?

    But
    no(  x \in ( \mathbf{A} \cup \mathbf{B})) \Longleftrightarrow x \not \in (\mathbf{A} \cap \mathbf{B})

    is wrong, right?
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