Re: Relational operators on intervals: bug?
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- Subject: [mg128664] Re: Relational operators on intervals: bug?
- From: Murray Eisenberg <murray at math.umass.edu>
- Date: Thu, 15 Nov 2012 03:57:15 -0500 (EST)
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On Nov 14, 2012, at 5:39 AM, Andrzej Kozlowski <akozlowski at gmail.com> wrote:
>
> On 14 Nov 2012, at 07:28, Richard Fateman <fateman at cs.berkeley.edu> wrote:
>
>> On 11/12/2012 9:13 PM, Murray Eisenberg wrote:
>>
>>>
>>> Here is the empty interval in Mathematica:
>>>
>>> Interval[{1, 0}]
>>>
>>> Indeed:
>>>
>>> Resolve[Exists[x, IntervalMemberQ[Interval[{1, 0}], x]]]
>>> False
>>>
>> Apparently this doesn't mean what you think it does. It gives the same
>> answer for Interval[{0,1}].
>
> Of course that is because
>
> IntervalMemberQ[Interval[{0, 1}], x]
>
> False
What remains surprising to me is:
Resolve[Exists[x, x \[Element] Reals, IntervalMemberQ[Interval[{0, 1}], x]]]
False
---
Murray Eisenberg murray at math.umass.edu
Mathematics & Statistics Dept.
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University of Massachusetts 413 545-2838 (W)
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Amherst, MA 01003-9305
- References:
- Re: Relational operators on intervals: bug?
- From: Richard Fateman <fateman@cs.berkeley.edu>
- Re: Relational operators on intervals: bug?
- From: Richard Fateman <fateman@cs.berkeley.edu>
- Re: Relational operators on intervals: bug?