Solve/Reduce and assumptions

*To*: mathgroup at smc.vnet.net*Subject*: [mg32887] Solve/Reduce and assumptions*From*: Hiranya Peiris <hiranya at astro.princeton.edu>*Date*: Mon, 18 Feb 2002 05:22:08 -0500 (EST)*Sender*: owner-wri-mathgroup at wolfram.com

I have a large set of simultaneous multivariate algebraic equations which I am solving using Solve and Reduce. I get as the answer a list of all possible sets of solutions. However, only one of these is valid, because the equations contain a constant parameter R which should be positive. I cannot find any way of getting Solve and Reduce to recognize this fact. For example, Solve[{eqn1,eqn2,...eqnN,R!=0},vars] works, while Solve[{eqn1,eqn2,...eqnN,R>0},vars] is invalid. Applying Simplify[Result,R>0] to the full solution set does not work either. I would be grateful for any advice on how to get around this. I am a newbie, and I tried everything I could think of - mailing this list is my last resort. Please copy any replies to my email address: hiranya at astro.princeton.edu Thanks very much! Hiranya