Singular Manual: surfer

| #### D.9.3.2 surfer Procedure from library `surf.lib` (see surf_lib). Usage: surfer(f); f poly Assume: f defines a surface given by one equation Return: nothing Note: requires the external program `surfer` to be installed, to close the graphical interface just close the window of surfer Example:
    LIB "surf.lib";
    ring rr1 = 0,(x,y,z),dp;
    // Steiner surface
    ideal J(2) = x^2*y^2+x^2*z^2+y^2*z^2-17*x*y*z;
    surfer(J(2));
    // --------------------
    surfer(x*(x2-y2)+z2);
    // E7
    surfer(x^3-x*y^3+z^2);
    // Whitney umbrella
    surfer(z^2-x^2*y);

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