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positive root only using Solve[]

  • To: mathgroup at smc.vnet.net
  • Subject: [mg41791] positive root only using Solve[]
  • From: "seferiad" <seferiad at pacbell.net>
  • Date: Thu, 5 Jun 2003 07:31:33 -0400 (EDT)
  • Sender: owner-wri-mathgroup at wolfram.com

Hello,
Consider the following equation.

Solve[x^2 ==1, x]

Mathematica will output 1 and -1 for x.  However, I only want Mathematica to
output the positive solution (i.e., x -> 1), so I can use this conveniently
in a subsequent equation. Is there a way to force the output to produce only
the positive solution?  Thanks, Jay


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