Re: Is a function a relation?
Date: Sat, 27 Jun 2009 02:10:02 GMT
Message-ID: <op.uv5uy0e4q7k8pw_at_imac.local>
On Sat, 27 Jun 2009 09:35:36 +1000, David BL <davidbl_at_iinet.net.au> wrote:
> On Jun 25, 12:26 pm, David BL <davi..._at_iinet.net.au> wrote:
There may be some talking at cross purposes here.
I had assumed that when database theoreticians talked about
interpretations they were talking about something similar to what
logicians call an interpretation (or interpretation function, depending on
what you're reading). In logic, an interpretation is very much a
mathematical construct (c.f. model theory).
(I've just received my mail-order of Date's Logic and Databases, so
>>
>> I agree that the topic of interpretation is relevant to database
>> theory.
>
> I'll take that back. I would rather narrow the term "database theory"
> to a pure mathematical discipline, and therefore instead say that
> interpretation is only relevant to the practical application of
> database theory.
>