Drexel dragonThe Math ForumDonate to the Math Forum


Math Forum
 Ask Dr. Math
 Discussions
 Internet Newsletter
 MathTools
 Problems of the Week
 Teacher2Teacher
 Teacher Exchange
 Workshops

Search All of the Math Forum:
Browse our Internet Mathematics Library

Views expressed in these public forums are not endorsed by Drexel University or The Math Forum.


Math Forum » Discussions » sci.math.* » sci.math.independent

Topic: Help from someone with a CAS requested.
Replies: 3   Last Post: Nov 15, 2012 5:26 PM

Advanced Search
Reply to this Topic Reply to this Topic

Back to Topic List Back to Topic List Jump to Tree View Jump to Tree View   Messages: [ Previous | Next ]
Ken.Pledger@vuw.ac.nz

Posts: 1,268
Registered: 12/3/04
Re: Help from someone with a CAS requested.
Posted: Nov 15, 2012 5:24 PM
  Click to see the message monospaced in plain text Plain Text   Click to reply to this topic Reply

In article <50A42515.AB08D67@btinternet.com>,
Frederick Williams <freddywilliams@btinternet.com> wrote:

> Elsewhere (1 - q^r)/(r(1 - q)) = (1 + c^(r/2))/2 is being discussed.
>
> Can some kind, helpful, generous person tell me what q is as a function
> of c and r?


Clearing the fractions gives you a polynomial equation of degree r in
q, which means trouble if r > 4. But choosing particular values of c
and r allows a numerical method such as Newton-Raphson.

Formulae like this turn up in financial mathematics, so it's not hard
to find elementary treatments such as
<http://www.ifitbreaks.com/solving.htm>.

Ken Pledger.

Point your RSS reader here for a feed of the latest messages in this topic.

[Privacy Policy] [Terms of Use]

© Drexel University 1994-2013. All Rights Reserved.
The Math Forum is a research and educational enterprise of the Drexel University School of Education.