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MathGroup Archive 2000

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Re: A simple problem

  • To: mathgroup at smc.vnet.net
  • Subject: [mg25809] Re: A simple problem
  • From: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>
  • Date: Sat, 28 Oct 2000 01:41:03 -0400 (EDT)
  • Organization: Universitaet Leipzig
  • References: <8t64ak$egt@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Hi,

something like 

Solve[a*t^2/2 - p == 0, t] // 
  FullSimplify[#, Element[{a, p}, Reals] && a > 0 && p > 0] &


?
Regards
  Jens

Paul Lutus wrote:
> 
> I have a very simple notation problem I cannot solve (because of my limited
> knowledge of Mathematica).
> 
> Example -- an equation from physics:
> 
> f := a * t^2 / 2 - p == 0
> 
> Now I want to create the different forms of this equation, such as:
> 
> Solve[f,t]
> 
> which produces:
> 
> sqrt(2) * sqrt(p) / sqrt(a)
> 
> Okay, the correct general solution. What I really wanted was the limited
> solution ( sqrt(2p/a) ). I know I need to say "assume all the variables are
> >= 0", but I can't figure out how to express this.
> 
> I've tried applying a number of different constraints without success.
> 
> Hey -- I warned you. Simple problem. :)
> 
> --
> 
> Paul Lutus
> www.arachnoid.com


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