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Home -> Community -> Usenet -> comp.databases.theory -> Re: Is {{}} a valid construct?
> {} would be the nullary relation called DUM
> having cardinality and degree zero
> {{}} would be the nullary relation called DEE
> having cardinality one and degree zero
> DEE and DUM are the relational analogs of true and false.
According to my understanding, it seems {} and {{}} are invalid constructs. How can I empirically verify they are valid? I can't see how nothing means something. Received on Fri Feb 02 2007 - 23:54:47 CST
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