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 8h reviewed Reject Mapping a pure function with multiple slots 15h comment How do you solve a linear equation of matrices? Possible duplicate of General form of a linear transformation 18h reviewed Reject charts tag wiki excerpt 18h awarded Enlightened 19h awarded Nice Answer Apr 27 revised Drop in nested tables? added 3 characters in body; edited tags Apr 27 answered Drop in nested tables? Apr 18 reviewed Reject Segmentation fault on auto-complete Apr 18 revised Maximize a variable in NSolve Function added 1422 characters in body Apr 16 revised Maximize a variable in NSolve Function added 27 characters in body; edited tags; edited title Apr 16 revised Maximize a variable in NSolve Function added 200 characters in body Apr 16 revised Maximize a variable in NSolve Function added 276 characters in body Apr 16 answered Maximize a variable in NSolve Function Apr 16 comment Maximize a variable in NSolve Function And what about x1, x2, x3 ? And what is \[Eta]2? Apr 16 comment Maximize a variable in NSolve Function What do you want to maximize, what are underlying conditions? Apr 13 comment Compactness and Connectedness of sets This question is very general and the answer is "of course, we can", if you are interested in a certain topological technique related to the general problem see e.g. this anser Finding minimal distance between two surfaces Apr 12 comment What makes imaginary parts show up? Basically since your numbers in Table are approximate your problem appears to be trivial. Nevertheless if there is a certain problem at all, it was raised in his question How to eliminate the zero real part of a purely imaginary number?. The issue is version dependent. Apr 6 comment Image of the unit circle under a complex rational function Closely related Plotting complex numbers as an Argand Diagram. If it is not a duplicate, explain why. Apr 2 comment Determine integer results using Solve The answer to this question should be quite helpful: How Can I use Solve/Reduce Output. Mar 31 comment Solving simple transcendental equation This is a duplicate of Can Reduce really not solve for x here?. However if it doesn't enlighten you, take a look at Roots of a characteristic equation. Can Mathematica solve it?.