[Maxima] enforce real solutions
andre.maute at gmx.de
Fri Apr 27 06:08:14 CDT 2012
On 04/27/2012 12:16 PM, Wilhelm Haager wrote:
> Solving the equation
> gives imaginary results:
> [x = -%i/sqrt(a-1),x = %i/sqrt(a-1),x = 0]
> I would like to have the results in the following form, i.e. real:
> [x = -1/sqrt(1-a),x = 1/sqrt(1-a),x = 0]
> assume(a<1) gives the desired result, but I require real solutions in
> automated calculations
> where I cannot make any assumptions in advance.
> Before the equation is solved, I cannot see what I have to assume.
> Is there a simple way (without subsequent maps and other tricky
> transformations) to enforce that?
> (algsys with realonly=true does not work in the desired way).
Doesn't the casus irreducibilis apply here?
> Thanks in advance
> Wilhelm Haager
> Maxima mailing list
> Maxima at math.utexas.edu
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