| #### D.13.6.40 groebnerFan Procedure from library `tropical.lib` (see tropical_lib). Usage: groebnerFan(f); f poly groebnerFan(I); I ideal Assume: I homogeneous Return: fan, the Groebner fan of f resp. I Note: set printlevel=1 for output during traversal Example:
    LIB "tropical.lib";
    ring r = 0,(x,y,z,w),dp;
    ideal I = x-2y+3z,3y-4z+5w;
    groebnerFan(I);

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