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Graph of z = -10(x^2 + y^2) + (x^2 + y^2)^2
This image was generated by a program I, the uploader (Jcobb), wrote myself.
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La bildo estas kopiita de wikipedia:en. La originala priskribo estas: Graph of z = -10(x^2 + y^2) + (x^2 + y^2)^2 This image was generated by a program I, the uploader (Jcobb), wrote myself. {{GFDL}} {| border="1" ! date/time || username || edit summa