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Nov 12, 2017 at 12:04 answer added Péter Komjáth timeline score: 2
Nov 5, 2017 at 15:38 vote accept Dominic van der Zypen
Nov 5, 2017 at 13:26 comment added Fedor Petrov It looks like any connected component which is not an odd cycle (in particular, any infinite component) admits such a coloring with 2 colors.
Nov 5, 2017 at 10:59 answer added HYL timeline score: 7
Nov 5, 2017 at 10:33 history edited Dominic van der Zypen CC BY-SA 3.0
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Nov 5, 2017 at 7:39 history asked Dominic van der Zypen CC BY-SA 3.0