Date: Mar 21, 2013 3:57 AM
Author: William Hughes
Subject: Re: Matheology § 224
On Mar 21, 8:46 am, WM <mueck...@rz.fh-augsburg.de> wrote:

> My question remains: What is the subset of necessary lines?

There is no such thing as a necessary line.

There is such a thing as a sufficient set of

lines (all sufficient sets are composed

entirely of unnecessary lines, which means

that you can remove any finite set of lines

from a sufficient set and get a different sufficient

set of lines). The intersection of all sufficient

sets is empty.