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Timeline for History of the four-colour problem

Current License: CC BY-SA 3.0

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Jan 22, 2012 at 4:43 comment added Brendan McKay Thanks, confirmation from an expert that it is new is exactly what I needed. I did spell De Morgan incorrectly in the paper I submitted, but I'll be sure to fix it. Brendan.
Jan 22, 2012 at 4:41 vote accept Brendan McKay
Jan 21, 2012 at 21:14 history answered Robin Wilson CC BY-SA 3.0