77 search results - page 11 / 16 » Contractions of Planar Graphs in Polynomial Time |
62
Voted
FOCS
2003
IEEE
15 years 5 months ago
2003
IEEE
We give a surprisingly short proof that in any planar arrangement of Ò curves where each pair intersects at most a fixed number (×) of times, the -level has subquadratic (Ç´...
89
Voted
JGT
2008
14 years 11 months ago
2008
A homomorphism from an oriented graph G to an oriented graph H is a mapping from the set of vertices of G to the set of vertices of H such that ----(u)(v) is an arc in H whenever...
84
Voted
JGT
2007
14 years 11 months ago
2007
It is known that for every integer k ≥ 4, each k-map graph with n vertices has at most kn − 2k edges. Previously, it was open whether this bound is tight or not. We show that ...
87
Voted
ESA
2006
Springer
15 years 3 months ago
2006
Springer
Abstract. Zigzag pocket machining (or 2D-milling) plays an important role in the manufacturing industry. The objective is to minimize the number of tool retractions in the zigzag m...
ISAAC
2009
Springer
15 years 4 months ago
2009
Springer
For a connected graph G = (V, E), a subset U ⊆ V is called a k-cut if U disconnects G, and the subgraph induced by U contains exactly k (≥ 1) components. More specifically, a ...