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MathGroup Archive 2004

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Re: Re: Solve given that a variable is between 0 and 1

  • To: mathgroup at smc.vnet.net
  • Subject: [mg52659] Re: [mg52636] Re: Solve given that a variable is between 0 and 1
  • From: "yehuda ben-shimol" <benshimo at bgu.ac.il>
  • Date: Tue, 7 Dec 2004 04:09:50 -0500 (EST)
  • Sender: owner-wri-mathgroup at wolfram.com

The problem at hand is easily solved by hand in about 60 seconds.
Yehuda

-----Original Message-----
From: Steve Luttrell [mailto:steve_usenet at _removemefirst_luttrell.org.uk] 
To: mathgroup at smc.vnet.net
Subject: [mg52659] [mg52636] Re: Solve given that a variable is between 0 and 1

To solve algebraically you need to give a numerical value to b, and then 
only certain values lead to simple closed-form solution. Otherwise, you have

to solve numerically.

Algebraic example:

b = 1/2;
Solve[w - k^(1 - b)*r*((-((a*k^b - OverBar[y])/a))^
       (1/b))^(-1 + b) == 0, k]

gives

{{k -> (w^2*OverBar[y]^2)/(a^2*(-r + w)^2)},
  {k -> (w^2*OverBar[y]^2)/(a^2*(r + w)^2)}}

Numerical example:

b = 0.4;
w = 1;
a = 1;
r = 1;
OverBar[y] = 1;
NSolve[w - k^(1 - b)*r*((-((a*k^b - OverBar[y])/a))^
       (1/b))^(-1 + b) == 0, k]

gives

{{k -> 0.17677669529663688110021109052621}}

Steve Luttrell

"Jason" <jsr123 at gmail.com> wrote in message 
news:cos13d$dl2$1 at smc.vnet.net...
> Hi all,
>
> I need some help with solving the following:
>
> \!\(Solve[
>    w - k\^\(1 - b\)\ r\ \((\((\(-\(\(a\ k\^b - 
> y\&_\)\/a\)\))\)\^\(1\/b\))\)\
> \^\(\(-1\) + b\) \[Equal] 0, k]\)
>
> given that a>0 and 0<b<1.
>
> How do I do this?
>
> Thanks MUCH!!---jason
> 




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