Re: A Simple Notation
Date: Sat, 07 Jul 2007 15:30:32 GMT
Brian Selzer wrote:
> "paul c" <toledobythesea_at_oohay.ac> wrote in message
>>Brian Selzer wrote: >> >>>"David Cressey" <cressey73_at_verizon.net> wrote in message >>>news:eirji.2$475.1_at_trndny04... >>>
>>I wonder when, in the course of the usual human affairs as they involve >>the basic relational dbms op's, does it make sense to think of infinite >>domains? Isn't it usually sufficient, as far as algebra is concerned, to >>pretend they are finite? >>
> Why limit yourself to what can be represented in a computer? An algebra
> that supports relations with infinite cardinality or degree can certainly
> support any relation that can be represented in a computer.
As somebody here said (perhaps it was you, I forget), it seems important to separate relational operators from the rest of a language where we can do non-relational things, such as arithmetic addition. As far as a dbms that stores extensions/propositions is concerned, I don't see that it is possible to store infinite sets of values, so I wouldn't know how to implement that.
p Received on Sat Jul 07 2007 - 17:30:32 CEST