Re: Is a function a relation?

From: David BL <>
Date: Mon, 29 Jun 2009 18:51:53 -0700 (PDT)
Message-ID: <>

On Jun 29, 11:01 pm, Cimode <> wrote:

> <<
> Given a relation type (i.e. schema), there are a number (possibly
> infinite) of relation values that conform to that type. The type and
> the values of that type are all abstract and carry almost no
> information. >>

> The cardinality of un-ary relation subtype can *not* exceed the
> cardinality of the relation supertype. That is a constraint imposed
> by how a relation is defined.

Sure. Why did you say that? Received on Tue Jun 30 2009 - 03:51:53 CEST

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