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Re: Notions of Type

From: paul c <toledobythesea_at_oohay.ac>
Date: Thu, 17 Aug 2006 23:59:32 GMT
Message-ID: <Ep7Fg.426352$IK3.188701@pd7tw1no> 





Aloha Kakuikanu wrote:


> Keith H Duggar wrote:


>> Marshall wrote:
>>> Very true. Of the various relational operators that have
>>> been identified over the years, only a few, like union,
>>> are really algebraic.




> 

> Except that union applies to relations of the same arity only. 




I thought that was only a practical restriction, ie., in theory, any 
relations can be unioned?



p
Received on Thu Aug 17 2006 - 18:59:32 CDT












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