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Home -> Community -> Usenet -> comp.databases.theory -> Re: constraints in algebra instead of calculus
paul c wrote:
> paul c wrote:
>
>> paul c wrote:
>>
[snip]
> Apart from trying to answer your original question, the exercise
> interests me mainly as a way to possibly understand equivalence of two
> relations one of which 'contains' rva's and one which doesn't.
If one contains rva's and the other doesn't, they have different types and cannot possibly be equivalent. One might have a simple expression to construct one from the other and vice versa, but that is a different thing entirely. Received on Fri Jun 15 2007 - 09:01:11 CDT
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