This map lead to a conjecture in graph theory in 19th century which till now has not been proved “properly”. Although computerized exhaustive search proofs exist, mathemeticians reject it by calling it a “telephone directory” and they want the proof to be a “poem”.

Identify the conjecture/theorem/problem.

Happy New Year!

Cracked by: udupendra(Congratulations on scoring a century!) , jayanth , madhur , Dibyo , shenoyvarun86 , sumanth , sidsen , Ranjana Ninan , Shreyas , Keerthi , VikraM , piezocake , BiGFooT , nishas thambi , Gammafunction , prasanth , yaksha , Poornima , bobo , shashank and Arjun Chennu.

udupendra, jayanth, madhur, Dibyo, shenoyvarun86, sumanth, sidsen, Ranjana Ninan, Shreyas, Keerthi, VikraM, piezocake, BiGFooT, nishas thambi, Gammafunction, prasanth, yaksha, Poornima, bobo, shashank and Arjun Chennu