On 17 December 2013 13:07, meekerdb <meeke...@verizon.net> wrote:

> In a sense, one can be more certain about arithmetical reality than the
> physical reality. An evil demon could be responsible for our belief in
> atoms, and stars, and photons, etc., but it is may be impossible for that
> same demon to give us the experience of factoring 7 in to two integers
> besides 1 and 7.
> But that's because we made up 1 and 7 and the defintion of factoring.
> They're our language and that's why we have control of them.
> If it's just something we made up, where does the "unreasonable
effectiveness" come from? (Bearing in mind that most of the non-elementary
maths that has been found to apply to physics was "made up" with no idea
that it mighe turn out to have physical applications.)

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