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On a problem in map colouring. (English) Zbl 0187.21001

Keywords:
topology
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References:
[1] Красносєльский М. А., Крєйн С. Г.: O6 одном классє мєорєм єдунсмєєнносму для уравнєнуя \(y' = f(x, y)\). Ycnexn matem, наук 11 (1965), 209-213.
[2] Brooks R. L.: On coloring the nodes of a network. Proc. Cambridge Philos. Soc. 37 (1941), 194-197. · Zbl 0027.26403
[3] Ringel G.: Färbungsprobleme auf Flächen und Graphen. VEB Deutscher Verlag der Wissenschaften, Berlin 1959. · Zbl 0088.39601
[4] Palczewski B.: On the uniqueness of solutions and the convergence of successive approximations in the Darboux problem under the conditions of the Krasnosielski and Krein type. Ann. Polon. Math. 14 (1964), 183-190. · Zbl 0132.07301
[5] Ringel G.: Ein Sechsfarbenproblem auf der Kugel. Abhandl. math. Semin. Univ. Hamburg 29 (1965), 107-117. · Zbl 0132.20701
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