>> A "plane tree" is a tree with an embedding into the plane. >> >> A "planar tree" is a tree which can be embedded in the plane. Every >> tree is planar, so this term is offensive and redundant.
+1 Both notions are defined for graphs in exactly this way, see http://en.wikipedia.org/wiki/Planar_graph. Best, Christian -- You received this message because you are subscribed to the Google Groups "sage-combinat-devel" group. To post to this group, send email to sage-combinat-devel@googlegroups.com. To unsubscribe from this group, send email to sage-combinat-devel+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/sage-combinat-devel?hl=en.
