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Nov 13, 2017 at 12:42 history edited Dominic van der Zypen CC BY-SA 3.0
definition of col(.)
Mar 6, 2015 at 7:39 comment added Dominic van der Zypen If you replace the colouring number with the chromatic number, the question is equivalent to the Erdos-Faber-Lovasz conjecture (en.wikipedia.org/wiki/…) -- see arxiv.org/abs/math/0305073
Mar 5, 2015 at 23:43 comment added Andrew D. King What happens if you replace the colouring number with the minimum degree $+1$, or the maximum degree $+1$, or the chromatic number?
Mar 5, 2015 at 10:27 history asked Dominic van der Zypen CC BY-SA 3.0