Re: Relational operators on intervals: bug?

*To*: mathgroup at smc.vnet.net*Subject*: [mg128645] Re: Relational operators on intervals: bug?*From*: Bob Hanlon <hanlonr357 at gmail.com>*Date*: Tue, 13 Nov 2012 00:03:58 -0500 (EST)*Delivered-to*: l-mathgroup@mail-archive0.wolfram.com*Delivered-to*: l-mathgroup@wolfram.com*Delivered-to*: mathgroup-newout@smc.vnet.net*Delivered-to*: mathgroup-newsend@smc.vnet.net*References*: <k7p3j3$ca3$1@smc.vnet.net>

$Version "8.0 for Mac OS X x86 (64-bit) (October 5, 2011)" IntervalIntersection[Interval[{0, 2}], Interval[{6, 8}]] Interval[] Min[Interval[]] Infinity Max[Interval[]] -Infinity IntervalMemberQ[ Interval[], #] & /@ {-Infinity, -$MaxNumber, -1, -$MinNumber, 0, $MinNumber, 1, $MaxNumber, Infinity} {False, False, False, False, False, False, False, False, False} So Interval[] is the range of all values Greater than Infinity and less than -Infinity, appears to be "empty." Bob Hanlon On Mon, Nov 12, 2012 at 3:07 AM, Richard Fateman <fateman at cs.berkeley.edu> wrote: > On 11/11/2012 12:59 PM, bertiiiiiiiiiiiiiiiiiiiiiiiiii at gmail.com wrote: > >> 1. Comparision of any Interval[___] to the empty interval Interval[]: >> > > What makes you think that this is a notation for an empty Interval, > whatever that is? > > >