Every planar map is four colorable
Kenneth Appel and Wolfgang Haken.
Providence, R.I. : American Mathematical Society, ©1989.
xv, 741 págs. : ilustraciones ; 26 cm.
Serie: Contemporary mathematics, 0271-4132 ; v. 98
ISBN: 0821851039
"We present an emended version of our proof of the Four-Color Theorem in a form as self-contained as we can make it. In addition, we have included a proof that four coloring of planar maps can be done in polynomial time"—Authors' note.
Incluye referencias bibliográficas.
Reseña: MathSciNet, 91m:05079