*To*: Gottfried Barrow <gottfried.barrow at gmx.com>*Subject*: Re: [isabelle] Want to use Rep_Integ or lifting after [quot_del] in Int.thy*From*: Makarius <makarius at sketis.net>*Date*: Thu, 23 May 2013 13:05:04 +0200 (CEST)*Cc*: cl-isabelle-users at lists.cam.ac.uk*In-reply-to*: <519C3A46.3080901@gmx.com>*References*: <519AE86B.2030208@gmx.com> <3E3AEE15-2181-46D1-A676-85F7EC6FE1A4@cam.ac.uk> <519C3A46.3080901@gmx.com>*User-agent*: Alpine 2.00 (LNX 1167 2008-08-23)

On Tue, 21 May 2013, Gottfried Barrow wrote:

It'd be interesting to know if it's common these days for other languages touse the classic definition of the integers as equivalence classes like youdid with Int.thy:https://en.wikipedia.org/wiki/Integer#ConstructionIt seems it's common for the natural numbers to be built using thesuccessor function, but I'm guessing it's not so common for the integersto be equivalence classes.

http://cstheory.stackexchange.com/questions/3772/why-naturals-instead-of-integers http://mathoverflow.net/questions/29090/direct-construction-of-the-integers Makarius

**References**:**[isabelle] Want to use Rep_Integ or lifting after [quot_del] in Int.thy***From:*Gottfried Barrow

**Re: [isabelle] Want to use Rep_Integ or lifting after [quot_del] in Int.thy***From:*Lawrence Paulson

**Re: [isabelle] Want to use Rep_Integ or lifting after [quot_del] in Int.thy***From:*Gottfried Barrow

- Previous by Date: Re: [isabelle] I/O error after "Isabelle build -o browser_info -v -c -a"
- Next by Date: Re: [isabelle] Want to use Rep_Integ or lifting after [quot_del] in Int.thy
- Previous by Thread: Re: [isabelle] Want to use Rep_Integ or lifting after [quot_del] in Int.thy
- Next by Thread: Re: [isabelle] Want to use Rep_Integ or lifting after [quot_del] in Int.thy
- Cl-isabelle-users May 2013 archives indexes sorted by: [ thread ] [ subject ] [ author ] [ date ]
- Cl-isabelle-users list archive Table of Contents
- More information about the Cl-isabelle-users mailing list