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Re: Solve problem

• To: mathgroup at smc.vnet.net
• Subject: [mg98138] Re: Solve problem
• From: "Bruno Campanini" <BC at gmail.com>
• Date: Tue, 31 Mar 2009 04:18:16 -0500 (EST)
• References: <gqkv3d$4f6$1@smc.vnet.net>

"Bob Hanlon" <hanlonr at cox.net> wrote in message 
news:gqkv3d$4f6$1 at smc.vnet.net...
> a1 /. Select[{{b1 -> -2, a1 -> -1}, {b1 -> 0.5, a1 -> 3}},
>  (a1 /. #) > 0 &]
>
> {3}
>
> Cases[{{b1 -> -2, a1 -> -1}, {b1 -> 0.5, a1 -> 3}},
> (a1 -> x_ /; x > 0) :> x, Infinity]
>
> {3}
>
> Or instead of using Solve use Reduce and include constraint on a1

Ok Bob.
Thank you and thank all the people that gave me
such useful info.

Bruno