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Home -> Community -> Usenet -> comp.databases.theory -> Re: So what's null then if it's not nothing?
Jon Heggland wrote:
> ...
> No. He doesn't define equivalence; AND, OR and NOT is not sufficient. He
> could very well have envisioned an equivalence truth table where w<->w
> is w, not T.
> ...
Just interloping here, so I don't really know the thrust of the conversation, but the above caught my eye. If w<->w is meant as 'w if and only if w', surely <AND> is equivalent?
p Received on Mon Dec 05 2005 - 11:52:25 CST
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