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COMPGEOM
2007
ACM
13 years 11 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 11 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 11 months ago
The voronoi diagram of three lines
Hazel Everett, Sylvain Lazard, Daniel Lazard, Moha...
COMPGEOM
2007
ACM
13 years 11 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 11 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 11 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 11 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...