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 Feb 3 comment Creating the Nabla operator as a operator It does seem to Work for just \[del], But do you also know if there is any way to make mathematica interpret the \[Del]^2f[x,y,z] as the second derivatives of the function f[x,y,z]? Feb 3 asked Creating the Nabla operator as a operator Sep 24 awarded Autobiographer Apr 12 awarded Popular Question Oct 25 comment Can mathematica simplify an expression setting simplified answer equal to zero? But still using that method, when I define a, I want it to fly to the left hand side... as I now know this value it's no longer unknown? Does that make sence? The thing is.. have all these equations ´where a-b==c*d´ and I'm trying to build a matrix, therefore i need to have knowns on one side, and unknowns on the other side. see this: i.imgur.com/jgzo7.png Oct 25 awarded Student Oct 25 comment Can mathematica simplify an expression setting simplified answer equal to zero? i have : a - b == c * d c = 1, therefore, by simplifying mathematica outputs: a = d + b Can i output that as 0 = (d+b)/a ? ------------------------------ All known on one side, all unkown on the other side... Oct 25 comment Can mathematica simplify an expression setting simplified answer equal to zero? Yeah, but I also have some expressions which equal 1, and I do not want that moved over setting everything to equal zero... Basically I want all unknown on one side. And all that's known (defined) on the other side.. Oct 25 awarded Editor Oct 25 revised Can mathematica simplify an expression setting simplified answer equal to zero? edited title Oct 25 comment Can mathematica simplify an expression setting simplified answer equal to zero? Yeah I tried that... But how can you tell it to reduce so you have constants on one side ? Oct 25 asked Can mathematica simplify an expression setting simplified answer equal to zero?