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| Hello, im trying to make som graphics with my Mathematica: f[x_, y_] := (1 - x^2 - y^2)/(1 + x^2 + y^2) a := -4 b := 4 c := -5 d := 5 F = Plot3D[ f[x, y], {x, a, b}, {y, c, d}, PlotLabel -> "3D.Diagramm", AspectRatio ->... |