Bruno:
 That is a good enough explanation for me not to read the paper.
                             Ronald

On Dec 1, 10:55 am, Bruno Marchal <marc...@ulb.ac.be> wrote:
> I have read it quickly. You can use that paper as an introduction to  
> the use of ultrafilters in Model theory. The application in physics  
> are not precisely justified, and the paper does not address any  
> fundamental questions, so I am not sure it is relevant here.
> It is also pretty much technical. I don't use much "model theory" in  
> this list, because it is too much technical, but if you go through all  
> the book of Mendelson, I think you could intuit by yourself if it is  
> relevant for the question you are interested in.
> I have no doubt that some "ultrafilter" construction of non standard  
> infinitesimal numbers can have some use in physics, if only to redeem  
> Newton and Leibniz form of infinitesimal analysis. But it is a  
> technical issue, and I am agnostic on the question if such  numbers  
> could play a conceptual role in physics.
> Technically I would opt for synthetic toposes, or things like that,  
> which seems more promising, but I can hardly say that I have any  
> conviction there.
> I tend to think that real numbers (standard or not) are really  
> construction of the mind (of the universal machine), like comp invites  
> to consider (with Occam).
>
> Best,
>
> Bruno
>
> On 30 Nov 2009, at 19:18, ronaldheld wrote:
>
> >http://arxiv.org/PS_cache/arxiv/pdf/0911/0911.4824v1.pdf
> >  Can someone read this and explain any relevance it may have?
> >                               Ronald
>
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