| #### D.13.2.38 semigroupGenerator Procedure from library `gfan.lib` (see gfan_lib). Usage: semigroupGenerator(c); c cone Return: bigintmat, the generator of Z^n intersected with c modulo Z^n intersected with the lineality space of c Assume: dimension(c) == linealityDimension(c)+1 Example:
    LIB "gfan.lib";
    intmat M[3][2]=
    1,0,
    0,1,
    -1,0;
    cone c=coneViaPoints(M);
    semigroupGenerator(c);
    ==> 0,1

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