Every planar map is four colorable (Q56390610)
article by K. Appel & W. Haken published 1 September 1976 in Bulletin of the American Mathematical Society
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Current Data About Every planar map is four colorable
(P31) (Q13442814)

(P304) 711-713

(P433) 5

(P478) 82

(P577) Wednesday, September 1, 1976

(P1433) (Q2928101)

(P1476) "Every planar map is four colorable" (language: en)

(P2093) K. Appel
(P1545) 1

W. Haken
(P1545) 2

(P6104) (Q8487137)

other details
description article by K. Appel & W. Haken published 1 September 1976 in Bulletin of the American Mathematical Society

External Links
(P356) 10.1090/S0002-9904-1976-14122-5
(P894) 0331.05106
(P5875) 246115566