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jstarks4444
 Post subject: De Morgan's Laws proof
PostPosted: Mon, 17 Oct 2011 00:42:06 UTC 
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Hey all, needed some help with the following proof about De Morgan's laws:

Given two subsets A, B ⊆ X,
not (A ∩ B) = (not A) ∪ (not B)
and
not (A ∪ B) = (not A) ∩ (not B)

How would we go about proving this? Thanks for the help!
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 Post subject: Re: De Morgan's Laws proof
PostPosted: Mon, 17 Oct 2011 00:55:04 UTC 
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This belongs in foundations. Topic moved.

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 Post subject: Re: De Morgan's Laws proof
PostPosted: Mon, 17 Oct 2011 00:55:50 UTC 
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jstarks4444 wrote:
Hey all, needed some help with the following proof about De Morgan's laws:

Given two subsets A, B ⊆ X,
not (A ∩ B) = (not A) ∪ (not B)
and
not (A ∪ B) = (not A) ∩ (not B)

How would we go about proving this? Thanks for the help!


Draw a Venn Diagram.

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