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May 19, 2021 at 6:05 comment added Gerry Myerson mathoverflow.net/questions/273120/… is more about statements equivalent to the Four Color Theorem than about "generalizations, variations, and strengthenings," but still might be of some interest here.
May 18, 2021 at 19:28 answer added Gil Kalai timeline score: 2
Mar 2, 2021 at 21:24 history edited YCor CC BY-SA 4.0
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Feb 28, 2021 at 13:54 answer added P.Labarque timeline score: 2
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Apr 13, 2017 at 12:58 history edited CommunityBot
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Jan 9, 2017 at 12:47 answer added patrick labarque timeline score: 4
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Sep 11, 2016 at 7:06 history edited Gerry Myerson
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Sep 11, 2016 at 5:26 answer added Ian Agol timeline score: 12
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Sep 15, 2015 at 16:33 answer added Gil Kalai timeline score: 8
Sep 15, 2015 at 16:20 history edited Gil Kalai CC BY-SA 3.0
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Jan 8, 2015 at 20:23 answer added Gil Kalai timeline score: 4
Dec 9, 2014 at 22:56 comment added Jérôme JEAN-CHARLES One basic source is: "The Four-color Problem: Assaults and Conquest" by Saaty and Kainen. It contains so many nice reformulations (over 120!). Could be useful to "parallel" a generalization.
Dec 9, 2014 at 10:43 answer added Gil Kalai timeline score: 11
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Dec 7, 2014 at 23:34 history made wiki Post Made Community Wiki by Todd Trimble
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Dec 7, 2014 at 7:53 history asked Gil Kalai CC BY-SA 3.0