i1 : G = graph({{1, 2}, {1, 3}, {2, 3}, {3, 4}},EntryMode=>"edges");
i2 : coverIdeal G o2 = monomialIdeal (x x , x x , x x x ) 1 3 2 3 1 2 4 o2 : MonomialIdeal of QQ[x , x , x , x ] 1 2 3 4