Re: NULLs: theoretical problems?

From: Jon Heggland <>
Date: Mon, 03 Sep 2007 08:21:02 +0200
Message-ID: <fbg94r$7rd$>

Quoth Keith H Duggar:
> Jon Heggland wrote:

>> In this system, how can you check whether a given variable actually is
>> NULL or not?

> I'm not so sure what you mean by "check". Any proposition in
> IMPS is FALSE if any of its arguments is undefined. So as an
> example (x OR TRUE) is false if x is NULL. Does this suffice
> for what you mean by "check"?

Yes, thank you.

Received on Mon Sep 03 2007 - 08:21:02 CEST

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