Authors: Saenko V.I.
It is proved that the irreducible map according to Franklin consists of 5 regions and, as a consequence, 4 colors are sufficient for colouring any map on the sphere
Comments: 3 Pages. This is the Russian version, the English one is directed to the peer-reviewed journal
[v1] 2017-05-13 12:32:14
[v2] 2017-05-20 07:34:40
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