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Dear all,

Did anyone notice that the network printed on the T-shirt for the Barcelona EUSN conference, is actually a planar graph?  So it could have been drawn in a way such that no link cross each other.
There is even such a layout in which a line can separate yellow and blue nodes.

Thanks to Miranda Jessica Lubbers and JosÚ Luis Molina, and all the organizing committee, for a very nice conference.
  Christophe Prieur,                                               [log in to unmask]
  Liafa, UniversitÚ Paris-Diderot                           http://liafa.fr/~prieur/

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