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S Aug 5, 2020 at 11:49 history edited Glorfindel CC BY-SA 4.0
added the reference links
S Aug 5, 2020 at 11:49 history suggested vidyarthi CC BY-SA 4.0
added the reference links
Aug 5, 2020 at 11:37 review Suggested edits
S Aug 5, 2020 at 11:49
Apr 30, 2015 at 14:57 comment added Adam P. Goucher A la Tait, this means we can count the number of vertex 4-colourings of a fully-triangulated planar graph using the permanent of a matrix.
Feb 16, 2010 at 9:28 history edited Gjergji Zaimi CC BY-SA 2.5
added 4 characters in body
Feb 16, 2010 at 9:03 history answered Gjergji Zaimi CC BY-SA 2.5