On 19 Aug, 01:29, David Nyman <david.ny...@gmail.com> wrote:
> Bruno's position is that only one of the above can be true (i.e. CTM
> and PM are incompatible) as shown by UDA-8 (MGA/Olympia). I've also
> argued this, in a somewhat different form. Peter's position I think
> is that 1) and 2) are both false (or in any case that CTM and PM are
> compatible). Hence the validity of UDA-8 - in its strongest form -
> seems central to the current dispute, since it is essentially this
> argument that motivates the appeal to arithmetical realism, the topic
> currently generating so much heat. UDA-8 sets out to be provable or
> disprovable on purely logical grounds.
>I for one am unclear on what
> basis it could be attacked as invalid. Can anyone show strong grounds
> for this?
Of course, no argument can validly come to a metaphysical conclusion--
in this
case, that matter does not exist --without making a single
metaphysical assumption.
The argument is therefore invalid, or not purely logical
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