Re: Question: inequalities
- To: mathgroup@smc.vnet.net
- Subject: [mg11701] Re: Question: inequalities
- From: Allan Hayes <hay@haystack.demon.co.uk>
- Date: Sat, 21 Mar 1998 18:35:36 -0500
- References: <6eslt3$61t@smc.vnet.net>
Mike & Lizette Sullivan wrote:
>
> Hello everyone, I am using Mathematica 2.2:
......
> 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
Mike,
With Mathematica 3.x (I don't know if the package will work with 2.2)
<<Algebra`InequalitySolve`
?InequalitySolve
InequalitySolve[expr, x] gives the solution set of an
expression containing logical connectives and univariate
polynomial equations and inequalities in the variable x.
InequalitySolve[expr, {x1, ..., xn}] gives the solution
set of an expression containing logical connectives and
linear equations and inequalities in the variables {x1,
..., xn}.
InequalitySolve[Abs[2x+1]>5,x]
x < -3 || x > 2
--
Allan Hayes
Training and Consulting
Leicester, UK
hay@haystack.demon.co.uk
http://www.haystack.demon.co.uk
voice: +44 (0)116 271 4198
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