We prove that any planar graph on n vertices has less than O(5.2852^n) spanning trees. Under the restriction that the planar graph is 3-connected and contains no triangle and no quadrilateral the number of its spanning trees is less than O(2.7156^n). As a consequence of the latter the grid size needed to realize a 3d polytope with integer coordinates can be bounded by O(147.7 n^). Our observations imply improved upper bounds for related quantities: the number of cycle-free graphs in a planar graph is bounded by O(6.4884^n), the number of plane spanning trees on a set of n points in the plane is bounded by O(158.6^n), and the number of plane cycle-free graphs on a set of n points in the plane is bounded by O(194.7^n).
|Titel||Algorithms - ESA 2010 (18th Annual European Symposium, Liverpool, UK, September 6-8, 2010. Proceedings, Part I)|
|Redacteuren||M. Berg, de, U. Meyer|
|Plaats van productie||Berlin|
|ISBN van geprinte versie||978-3-642-15774-5|
|Status||Gepubliceerd - 2010|
|Naam||Lecture Notes in Computer Science|
|ISSN van geprinte versie||0302-9743|