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