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  • $\begingroup$ sorry, I've simplified the original problem to keep it simple and it was too much of a simplification... now I've set y^2 and x^2 the Jacobian is not constant. thanks. $\endgroup$ Commented Mar 19, 2020 at 1:21
  • $\begingroup$ Thanks! It works perfectly. I've tried for hours with no luck... Mathematica learning curve is a bit steep... $\endgroup$ Commented Mar 19, 2020 at 4:19
  • $\begingroup$ @CharlesM You're welcome. :) $\endgroup$ Commented Mar 19, 2020 at 12:48
  • $\begingroup$ I think what I've found difficult was to distinguish between the different types of objects that mathematica can handle. List, List of lists, Matrix, etc $\endgroup$ Commented Mar 19, 2020 at 18:29