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COMPGEOM
2007
ACM
13 years 8 months ago
On the hardness of minkowski addition and related operations
For polytopes P, Q Rd we consider the intersection P Q; the convex hull of the union CH(P Q); and the Minkowski sum P + Q. We prove that given rational H-polytopes P1, P2, Q it...
Hans Raj Tiwary
COMPGEOM
2007
ACM
13 years 8 months ago
Inflating the cube by shrinking
We present a continuous submetric deformation of the surface of the cube which increases the enclosed volume by about 25.67%. Categories and Subject Descriptors: I.3.5 [Computatio...
Kevin Buchin, André Schulz
COMPGEOM
2007
ACM
13 years 8 months ago
The voronoi diagram of three lines
Hazel Everett, Sylvain Lazard, Daniel Lazard, Moha...
COMPGEOM
2007
ACM
13 years 8 months ago
Guard placement for efficient point-in-polygon proofs
We consider the problem of placing a small number of angle guards inside a simple polygon P so as to provide efficient proofs that any given point is inside P. Each angle guard vi...
David Eppstein, Michael T. Goodrich, Nodari Sitchi...
COMPGEOM
2007
ACM
13 years 8 months ago
An optimal generalization of the centerpoint theorem, and its extensions
We prove an optimal generalization of the centerpoint theorem: given a set P of n points in the plane, there exist two points (not necessarily among input points) that hit all con...
Saurabh Ray, Nabil H. Mustafa
COMPGEOM
2007
ACM
13 years 8 months ago
Embedding 3-polytopes on a small grid
We show how to embed a 3-connected planar graph with n vertices as a 3-polytope with small integer coordinates. The coordinates are bounded by O(27.55n ). The crucial part is the ...
Ares Ribó Mor, Günter Rote, Andr&eacut...
COMPGEOM
2007
ACM
13 years 8 months ago
There are not too many magic configurations
A finite planar point set P is called a magic configuration if there is an assignment of positive weights to the points of P such that, for every line l determined by P, the sum o...
Eyal Ackerman, Kevin Buchin, Christian Knauer, Rom...