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MathGroup Archive 2007

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Re: Inequalities

  • To: mathgroup at smc.vnet.net
  • Subject: [mg78082] Re: [mg77978] Inequalities
  • From: Murray Eisenberg <murray at math.umass.edu>
  • Date: Fri, 22 Jun 2007 06:46:31 -0400 (EDT)
  • Organization: Mathematics & Statistics, Univ. of Mass./Amherst
  • References: <200706210929.FAA24243@smc.vnet.net>
  • Reply-to: murray at math.umass.edu

Exactly what did you type, and with which version of Mathematica?  Did 
you remember to include the x as 2nd argument?

In Mathematica 6.0:

   Reduce[-10<=3x+2<=10,x]
-4 <= x <= 8/3

   FindInstance[-10<=3x+2<=10,x]
{{x -> 0}}


Bruno Campanini wrote:
> -10 <= 3x+2 <= 10
> 
> I tried with FindInstance and Reduce but was unable to
> get the right range solution  -4 <= x <= 8/3
> 
> Any suggestions.
> 
> Bruno
> 

-- 
Murray Eisenberg                     murray at math.umass.edu
Mathematics & Statistics Dept.
Lederle Graduate Research Tower      phone 413 549-1020 (H)
University of Massachusetts                413 545-2859 (W)
710 North Pleasant Street            fax   413 545-1801
Amherst, MA 01003-9305


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