Re: A Topological Relational Algebra in Lisp
From: Norbert_Paul <norbertpauls_spambin_at_yahoo.com>
Date: Sun, 18 Jan 2015 10:24:10 +0100
Message-ID: <m9fu2t$vs6$1_at_dont-email.me>
Date: Sun, 18 Jan 2015 10:24:10 +0100
Message-ID: <m9fu2t$vs6$1_at_dont-email.me>
OOPS!!!
Norbert_Paul wrote:
> A topology could be
>
> T = { {}, {bathroom}, {hallway}, X}.
>
This is wrong. The topology looks like
T = { {}, {bathroom}, {hallway}, {bathroom, hallway}, X}.
> This gives a topology
>
> { {}, {bdoor}, X}
>
> the so-called "dual topology".
Also wrong. The dual topology looks like
{ {}, {bdoor}, {bdoor, bathroom}, {bdoor, hallway}, X }.
Seems, I am a bit out of practice. Received on Sun Jan 18 2015 - 10:24:10 CET