Oh man! Few things more hilarious than seeing condescending ignorance like hermitdev's get put down with impunity. In any case, the proofs are widely available and decades old: Appel, Kenneth; Haken, Wolfgang (1989),…
Oh man! Few things more hilarious than seeing condescending ignorance like hermitdev's get put down with impunity. In any case, the proofs are widely available and decades old: Appel, Kenneth; Haken, Wolfgang (1989),…