2012/01/13 by Brendan D. McKay, McKay, Brendan D.
Engineering · Mathematics · #graph theory and CDMA systems #math.CO #math.HO #msc:01A55 #msc:05C10 #msc:05C15
paper · pdf · doi:10.48550/arxiv.1201.2852
3 pages; revised sourcing, added extra information
arxiv created 2012/02/21 · arxiv updated 2012/02/22
The four-colour conjecture was brought to public attention in 1854, most probably by Francis or Frederick Guthrie. This moves back by six years the date of the earliest known publication.