| #### D.13.2.28 isSimplicial Procedure from library `gfan.lib` (see gfan_lib). Usage: isSimplicial(c); c cone isSimplicial(f); f fan Return: 1, if c resp f is simplicial; 0 otherwise Example:
    LIB "gfan.lib";
    intmat M1[3][3]=
    1,0,0,
    0,1,0,
    0,0,1;
    cone c1=coneViaPoints(M1);
    isSimplicial(c1);
    ==> 1
    intmat M2[4][3]=
    1,0,0,
    0,1,0,
    0,0,1,
    1,1,-1;
    cone c2=coneViaPoints(M2);
    isSimplicial(c2);
    ==> 0
    /***********************/
    fan f=emptyFan(3);
    isSimplicial(f);
    ==> 1
    intmat N1[3][3]=
    1,0,0,
    0,1,0,
    0,0,1;
    cone d1=coneViaPoints(N1);
    insertCone(f,d1);
    isSimplicial(f);
    ==> 1
    intmat N2[4][3]=
    1,0,0,
    0,1,0,
    1,0,-1,
    0,1,-1;
    cone d2=coneViaPoints(N2);
    insertCone(f,d2);
    isSimplicial(f);
    ==> 0

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