| Original Message (ID '126353') By jf: |
| In Response To 'Re: Re: a question about substitution'
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Both solutions from Solve work in the equation you asked Solve to solve for.
To select the preferred solution, you need to describe it in a way that Select or Cases can use.
The difference in the internal structure of the two solutions is that the first is multiplied by -1. With Cases, we can describe a pattern that is -1 times something else.
In[8]:= Cases[x /. {{x->-(Sqrt[-\[CapitalDelta]+\[Omega]]/(Sqrt[2] Sqrt[\[Omega]]))},{x->Sqrt[-\[CapitalDelta]+\[Omega]]/(Sqrt[2] Sqrt[\[Omega]])}}, - _ ]
Out[8]= {-(Sqrt[-\[CapitalDelta]+\[Omega]]/(Sqrt[2] Sqrt[\[Omega]]))}
See the attached notebook.
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