Talk:Heawood conjecture

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Mathematics rating:	Start Class	Mid Priority	Field: Discrete mathematics
Please update this rating as the article progresses, or if the rating is inaccurate. Click to show/hide comments. Please add to or update the comments to suggest improvements to the article. Please add useful comments here--Cronholm144 08:40, 23 May 2007 (UTC)

Does anyone have a reference for the statement that the chromatic number of the klein bottle is 6? Dmharvey Talk 02:52, 5 September 2005 (UTC)