Re: [isabelle-dev] Future of Nat_Transfer
I have never understood it and generally feel terror at the sight of any transfer operation. So I would be happy to get rid of it. Larry > On 19 Oct 2017, at 12:56, Florian Haftmann > wrote: > > My suggestion would be to remove it completely. > > Any opinions on that? ___ isabelle-dev mailing list isabelle-...@in.tum.de https://mailmanbroy.informatik.tu-muenchen.de/mailman/listinfo/isabelle-dev
Re: [isabelle-dev] Future of Nat_Transfer
See now http://isabelle.in.tum.de/repos/isabelle/rev/0230af0f3c59. Florian Am 19.10.2017 um 13:56 schrieb Florian Haftmann: > Dear all, > > the nowadays ancient theory Nat_Transfer (essentially providing an > attribute to transfer ad-hoc between theorems on nat vs. int) is almost > obsolete: > > * »almost« since I haven't figured out how relevant it is still for > HOL-Number_Theory > > * Conversion between nat and int is rarely needed since most common > lemmas are provided by type classes anyway nowadays. > > See also > http://isabelle.in.tum.de/repos/isabelle/file/ee874941dfb8/src/HOL/Nat_Transfer.thy > for the current state of affairs. > > My suggestion would be to remove it completely. > > Any opinions on that? > > Cheers, > Florian > > > > ___ > isabelle-dev mailing list > isabelle-...@in.tum.de > https://mailmanbroy.informatik.tu-muenchen.de/mailman/listinfo/isabelle-dev > -- PGP available: http://isabelle.in.tum.de/~haftmann/pgp/florian_haftmann_at_informatik_tu_muenchen_de signature.asc Description: OpenPGP digital signature ___ isabelle-dev mailing list isabelle-...@in.tum.de https://mailmanbroy.informatik.tu-muenchen.de/mailman/listinfo/isabelle-dev