Date: Dec 9, 2012 11:34 AM
Author: fom
Subject: Re: Mathematics in brief
On 12/9/2012 2:49 AM, Virgil wrote:

> In article

> <3d8719ec-bdc5-4d42-92f4-059598a76e95@8g2000yqp.googlegroups.com>,

> WM <mueckenh@rz.fh-augsburg.de> wrote:

>

>> On 9 Dez., 00:58, Virgil <vir...@ligriv.com> wrote:

>>

>>> A mathematical set only has to distinguish between elements and

>>> non-elements, never between one of its element and another.

>>

>> A real number in mathematics has to be an individual that is distinct

>> from every other real number.

>

> But no criterion for being in, or not in, the set of reals distinguishes

> between any one real and any another real.

>

> So however relevant such differences may be for other purposes, as far

> as any set containing them is concerned differences between members is

> totally irrelevant.

>

> "Is x a member of y?" is a purely yes or no question.

>

Only with respect to a well-construed universe of discourse.