Infrequent Mathematica User

*To*: mathgroup at smc.vnet.net*Subject*: [mg47037] Infrequent Mathematica User*From*: "Jim Dars" <jim-dars at comcast.net>*Date*: Mon, 22 Mar 2004 05:18:48 -0500 (EST)*Sender*: owner-wri-mathgroup at wolfram.com

Hi All, f is a defined below as a function of x, y, and z. I wish to take the partials set to zero and solve the 3 equations for x, y, and z. I've copied from Mathematica and had to clean up the paste, a bit. I used the partial symbol from the palette to define my partial derivatives. The 3 lines on this page look nothing like what I feed Mathematica. I've tried the "Solve equation" with just "a" and a[x_,y_,z_] etc. Mathematica replies {{}}. I sure would appreciate some advice. Thanks, Best wishes, Jim Jim-Dars at comcast.net f[x_, y_, z_] = x/(1 + x^2) + y/(1 + x^2 + y^2) + z/(1 + x^2 + y^2 + z^2); a[x_, y_, z_] = \[PartialD]\_x f;\)\[IndentingNewLine] b[x_, y_, z_] = \[PartialD]\_y f;\)\[IndentingNewLine] c[x_, y_, z_] = \[PartialD]\_z\ f;\)\[IndentingNewLine] Solve[{a[x_, y_, z_] == 0, b[x_, y_, z_] == 0, c[x_, y_, z_] == 0}, {x, y, z}]