A brief comment: a few weeks ago, I found myself doing a difficult epsilon/delta proof, invoking limit theorems using e/2^N and summing them up to get e, when I suddenly remembered non-standard analysis and how it could eliminate those horrible proofs. Only, by that time, I had nearly finished this proof; moreover, its argument (involving a bijection between N x N and N) might have been difficult to formalise using non-standard analysis.
However, I hope that non-standard analysis doesn't get overlooked in our developments; I recall once thinking that it was worth any number of decision procedures. Larry On 26 Oct 2009, at 08:17, Florian Haftmann wrote: > Hi Brian, > > I would like to come back to the matter of the non-standard transfer > method in theory src/HOL/NSA/StarDef.thy, or more exactly its name. > > With the perspective that in future the generic transfer facilities > (src/HOL/Tools/transfer.ML) could also provide a method "transfer", > both > methods have to be distinguished somehow. > > What comes to my mind are three options: > > a) rename non-standard transfer method to hyper_transfer > b) rename non-standard transfer method to star_transfer > c) or join theories src/HOL/NSA/StarDef.thy and src/HOL/NSA/Star.thy, > such that the resulting full method name is Star.transfer > > What's you opinion about this? > > Currently, the need is not urgent, but perhaps the upcoming release > is a > good opportunity. > > Cheers > Florian > > -- > > Home: > http://www.in.tum.de/~haftmann > > PGP available: > http://home.informatik.tu-muenchen.de/haftmann/pgp/florian_haftmann_at_informatik_tu_muenchen_de > > _______________________________________________ > Isabelle-dev mailing list > Isabelle-dev at mailbroy.informatik.tu-muenchen.de > https://mailmanbroy.informatik.tu-muenchen.de/mailman/listinfo/isabelle-dev
