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Re: Question: inequalities


  • To: mathgroup@smc.vnet.net
  • Subject: [mg11682] Re: Question: inequalities
  • From: Daniel Lichtblau <danl@wolfram.com>
  • Date: Sat, 21 Mar 1998 18:35:17 -0500
  • Organization: Wolfram Research, Inc.
  • References: <6eslt3$61t@smc.vnet.net>

Mike & Lizette Sullivan wrote:
> 
> Hello everyone, I am using Mathematica 2.2:
> 
> I'm taking my old calculus book and going through it again to touch up
> on my basics before beginning a Master's degree program in the fall
> (I've been out of college for four years).  I'm planning on using
> mathematica to generate solutions for the book problems that don't come
> with solutions, but I've hit a snag in chapter 1.1 :(
> 
> How do I get mathematica to give me a solution set for a inequality?
> 
> For example, lets say I want to get mathematica to solve  Abs(2x+1)>5,
> where Abs means Absolute Value Of?
> 
> Does mathematica have the capability of giving me a solution set like
> (-Infinity, -3) U (2, Infinity) which is the solution to this problem?
> 
> Please help.
> 
> Mike Sullivan
> mliz@mingspring.com

This cannot be done in version 2.2. In version 3 one can do this as
below.

In[1]:=  <<Algebra`InequalitySolve`

In[2]:=  InequalitySolve[Abs[2*x+1]>5, x] Out[2]= x < -3 || x > 2


Daniel Lichtblau
Wolfram Research



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