It would not be hard to present the history of graph theory as an account of the struggle to prove the four colour conjecture, or at least to find out why the problem is difficult.
Ito ay hindi maaring maging mahirap sa kasalukuyan ang kasaysayan ng graph theory bilang isang account ng pakikibaka upang patunayan ang apat na kulay haka-haka, o kahit man lang upang malaman kung bakit ang problema ay mahirap.