Re: Thinking about MINUS
From: Marshall <marshall.spight_at_gmail.com>
Date: 7 Jan 2007 11:46:32 -0800
Message-ID: <1168199192.024527.223910_at_i15g2000cwa.googlegroups.com>
Date: 7 Jan 2007 11:46:32 -0800
Message-ID: <1168199192.024527.223910_at_i15g2000cwa.googlegroups.com>
On Jan 7, 7:36 am, J M Davitt <jdav..._at_aeneas.net> wrote:
> All this "boolean operations on sets" has me scratching my head. There
> is, underneath it all, the presumption that one really means "is an
> element of," right?
If we're talking about plain sets, then yes. If we're talking about relations, it gets more interesting.
Marshall Received on Sun Jan 07 2007 - 20:46:32 CET