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 Author Comment/Response Ken 09/02/08 3:23pm I have a simple nonlinear system of equations that I want Mathematica to solve for. Here is what I try and it fails. t = ArcCos[n1 * 2 / Pi / F] b = x / Cos[t] x = Pi * F / 2 / n2 y = Sqrt[b^2 - x^2] x^-2 + y^-2 = 4 Solve[%, n2] Namely after the fifth equation Mathematica responds with what appears to me as a warning Set::write: Tag Plus in .... is Protected. The solver dies with this output Solve::eqf: 4 is not a well-formed equation. The answer I expect is n2 = sqrt(Pi^2*F^2-4*n1^2) Of course there is +- sqrt(...) to take into account, but I also know the following about my system that lets me eliminate the other answer n1 >= 0 n2 >= 0 Pi*F >= 2*n1 So in short I want Mathematica to solve the system for n2, and I also want it to isolate the only valid answer given the restrictions above. Thanks URL: ,

 Subject (listing for 'Trivial system of equations') Author Date Posted Trivial system of equations Ken 09/02/08 3:23pm Re: Trivial system of equations Xavier 09/03/08 07:26am
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