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Re: 2 stage solution with FindRoot


Correction by example:

I have functions f1[x1,x2,y1,y2] and f2[x1,x2,y1,y2]. I need to solve
the problem the following way. First, I need to solve for
{x1,x2}={{x1,x2}|D[f1,x1]=0&&D[f2,x2]=0}.  A solution is
{x1[y1,y2],x2[y1,y2]}. Substituting into original functions yields
f1[x1[y1,y2],x2[y1,y2],y1,y2] and f2[x1[y1,y2],x2[y1,y2],y1,y2].  Then,
I need to solve for
{y1,y2}={{y1,y2}|D[f1[x1[y1,y2],x2[y1,y2],y1,y2],y1]=0&&D[f2[x1[y1,y2],x2[y1,y2],y1,y2],y2]=0}

I apoligize for misspecification of the problem.


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