Suppose that a connected planar simple graph with e edges and v vertices contains no simple circuit of length 4 or less. Prove that if v 4 then e (5/3)v 10/3

6. (10 points) [O1, O2] Suppose that a connected planar simple graph with e edges and v vertices contains no simple circuit of length 4 or less. Prove that if v 2 4 then 10 3 0