-- -*- M2-comint -*- {* hash: -683691469 *} i1 : R = QQ[x_1..x_6]; i2 : G = graph({x_1*x_2,x_2*x_3,x_3*x_4,x_4*x_5,x_1*x_5,x_1*x_6,x_5*x_6}) --5-cycle and a triangle o2 = Graph{edges => {{x , x }, {x , x }, {x , x }, {x , x }, {x , x }, {x , x }, {x , x }}} 1 2 2 3 3 4 1 5 4 5 1 6 5 6 ring => R vertices => {x , x , x , x , x , x } 1 2 3 4 5 6 o2 : Graph i3 : numTriangles G o3 = 1 i4 : H = completeGraph R; i5 : numTriangles H == binomial(6,3) o5 = true i6 :