On 17 December 2013 13:07, meekerdb <[email protected]> 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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