|  |  D.9.3.2 surfer Procedure from librarysurf.lib(see  surf_lib).
 
Example: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
 |  | 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);
 | 
 |