| #### D.13.2.41 span Procedure from library `gfan.lib` (see gfan_lib). Usage: span(c); c cone Return: bigintmat, unique irredundant equations of c Note: the name 'span' was chosen to be in line with polymake's nomenclature Example:
    LIB "gfan.lib";
    intmat M[3][5]=
    1,0,0,0,0,
    0,1,0,0,0,
    0,0,1,0,0;
    cone c=coneViaPoints(M);
    bigintmat Eq=span(c);
    print(Eq);
    ==> 0,0,0,-1, 0,
    ==> 0,0,0, 0,-1

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