Date: Apr 5, 2013 3:03 PM
Author: William Hughes
Subject: Re: Matheology § 224
On Apr 5, 6:04 pm, WM <mueck...@rz.fh-augsburg.de> wrote:
> On 5 Apr., 12:08, William Hughes <wpihug...@gmail.com> wrote:
> > There is an infinite set of lines D
> > such that any finite subset of D can be removed.
> What has to remain?
This depends on the finite subset removed.
If the finite set removed is E then
D\E has to remain. Note that whatever
subset E is chosen the number of lines
in D\E is infinite (but of course we
do not know which lines are in D\E).
However, D cannot be removed without
changing the union of the remaining lines.