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Re: Mathematics in brief
Posted:
Dec 9, 2012 12:50 PM
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On Dec 9, 7:34 pm, fom <fomJ...@nyms.net> wrote:
> On 12/9/2012 2:49 AM, Virgil wrote:
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> > In article
> > <3d8719ec-bdc5-4d42-92f4-059598a76...@8g2000yqp.googlegroups.com>,
> > WM <mueck...@rz.fh-augsburg.de> wrote:
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> >> On 9 Dez., 00:58, Virgil <vir...@ligriv.com> wrote:
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> >>> A mathematical set only has to distinguish between elements and
> >>> non-elements, never between one of its element and another.
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> >> A real number in mathematics has to be an individual that is distinct
> >> from every other real number.
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> > But no criterion for being in, or not in, the set of reals distinguishes
> > between any one real and any another real.
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> > 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.
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> > "Is x a member of y?" is a purely yes or no question.
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> Only with respect to a well-construed universe of discourse.
WRONG, a "consistent" theory in classical logic is just enough.
Zuhair
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