*To*: debian-curiosa@lists.debian.org*Subject*: Re: smaller than 0 but not negative (Re: question about "Conflicts:"*From*: Giovanni Mascellani <gio@debian.org>*Date*: Thu, 03 May 2012 08:46:08 +0200*Message-id*: <[🔎] 4FA229B0.1000902@debian.org>*In-reply-to*: <[🔎] 201205021928.39275.holger@layer-acht.org>*References*: <4F950206.8080306@aixigo.de> <87hawaze8b.fsf@qurzaw.varnish-software.com> <20120430165756.GA13974@free.fr> <[🔎] 201205021928.39275.holger@layer-acht.org>

Hi. Il 03/05/2012 03:28, Holger Levsen ha scritto: > On Montag, 30. April 2012, Ralf Treinen wrote: >> Conflicts: foo (>= 0), foo (<< 0) >> to be exact, since versions smaller than 0 are possible. > > *grin* > > btw, is the concept of numbers smaller than zero but not negative known/used > anywhere outside of debian/dpkg? In maths we have quite a few ways to define number greater than zero, but less than any other positive (real) number: https://en.wikipedia.org/wiki/Infinitesimal The most widespread is probably the concept of hyperreal number. They don't strictly speaking fall into your definition, since "smaller than zero" is usually defined to be exactly the opposite of "negative" (in particular, if Debian used hyperreal numbers for package versions, no foo hyperversion would never be installable with the requirements above), but is probably the mathematical answer which fits more with your question. Giovanni. -- Giovanni Mascellani <mascellani@poisson.phc.unipi.it> Pisa, Italy Web: http://poisson.phc.unipi.it/~mascellani Jabber: g.mascellani@jabber.org / giovanni@elabor.homelinux.org

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**References**:**smaller than 0 but not negative (Re: question about "Conflicts:"***From:*Holger Levsen <holger@layer-acht.org>

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