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Aug 13, 2018 at 11:46 comment added bof You could just say that $\mathcal F$ is $2$-colorable, i.e., the hypergraph $(X,\mathcal F)$ has chromatic number $\le2.$
Aug 13, 2018 at 9:24 vote accept Dominic van der Zypen
Aug 13, 2018 at 7:23 answer added bof timeline score: 5
Aug 13, 2018 at 6:36 history asked Dominic van der Zypen CC BY-SA 4.0