armstrong's axioms: augmentation - help pls
From: loveboat <l0veb0at_at_gmx.de>
Date: Thu, 2 Dec 2004 13:05:09 +0100
Message-ID: <con0pi$c5c$1_at_svr7.m-online.net>
hi,
Date: Thu, 2 Dec 2004 13:05:09 +0100
Message-ID: <con0pi$c5c$1_at_svr7.m-online.net>
hi,
in armstrongs axioms, i don't get the augmentation, which is: (X -> Y) => (XZ -> YZ)
why is that? i mean when Y is functional depending from X, i can't just add
another set of attributes and make them dependent as well? (at least that's
what i think)
why can i do that?
thx for help,
toni
Received on Thu Dec 02 2004 - 13:05:09 CET