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May 30, 2017 at 19:00 vote accept Dominic van der Zypen
May 30, 2017 at 7:05 answer added user1272680 timeline score: 4
May 29, 2017 at 19:31 review Close votes
May 30, 2017 at 0:22
May 29, 2017 at 17:52 comment added Peter Heinig Taken literally, the answer to question 1) is no in view of an extremely small counterexample: the non-connected graph $\bullet\quad\bullet$ - $\bullet$ has $\chi=2$, is not vertex-critical (delete $\bullet$) but is edge-critical because deleting the edge makes $\chi$ drop from $2$ to $1$, and there is only this edge.
May 29, 2017 at 15:11 answer added Abdelmalek Abdesselam timeline score: 2
May 29, 2017 at 14:53 history asked Dominic van der Zypen CC BY-SA 3.0