Re: Need Help: 1st order nonlinear differential equation

*To*: mathgroup at smc.vnet.net*Subject*: [mg51236] Re: [mg51215] Need Help: 1st order nonlinear differential equation*From*: DrBob <drbob at bigfoot.com>*Date*: Sat, 9 Oct 2004 04:19:11 -0400 (EDT)*References*: <200410080655.CAA25036@smc.vnet.net>*Reply-to*: drbob at bigfoot.com*Sender*: owner-wri-mathgroup at wolfram.com

That's totally unreadable. I recommend Omega Consulting's "Copy as InputForm" palette: http://eclecticdreams.net/DrBob/copy_as_inputform.htm Bobby On Fri, 8 Oct 2004 02:55:24 -0400 (EDT), Wolfgang <Wolfgang_Eggert at gmx.de> wrote: > I need to solve the following 1st order nonlinear differential > equation. I am really stuck. DSolve refuses to give an answer and I > need an algebraic solution. > > Derivative[1][a][Z] == > -((1/n + ((r*(n - 1))/(n^2*a[Z]))*((1 - a[Z])*n - (Â¦Ã? + 2*Â¦Ã?)*Z))/ > (r*(n - 1)*((n*(r - 1) - 2*r)/(n^2*a[Z]^2))*Z*((1 - a[Z])*n - > Â¦Ã?*Z))) > > where > > \!\({0 Â¡Ã? a Â¡Ã? 1, Z Â¡Ã? 0, n > 2, 1 > Â¦Ã? > 0, 1 > Â¦Ã? > 0, 1 > r > > 0, 0 < r < n\/\(n - 2\)}\) > > Does anybody know how to solve this problem? Has anybody tips how to > impose domain restrictions while solving differential equations in > Mathematica (version 5.0.1.0.)? > > Maybe I am thinking slow but I am really in trouble. > > Any help is greatly appreciated. Thank you for your time. > > Respectfully; > Wolfgang > > > > -- DrBob at bigfoot.com www.eclecticdreams.net

**References**:**Need Help: 1st order nonlinear differential equation***From:*Wolfgang_Eggert@gmx.de (Wolfgang)