All Questions
Tagged with computational-geometry computational-complexity
11 questions with no upvoted or accepted answers
7
votes
0
answers
122
views
Does the problem of recognizing 3DORG-graphs have polynomial complexity?
A 2DORG is the intersection graph of a finite family of rays directed $\to$ or $\uparrow$ in the plane. Such graphs can be recognized effectively (Felsner et al.). A 3DORG is the intersection graph of ...
- 4,535
6
votes
0
answers
237
views
Complexity of scissors congruence?
Where is the complexity of the problem 'Given two bounded compact convex integral polyhedra in $\mathbb R^n$ presented by $O(poly(n))$ integer valued halfspaces given by linear inequalities with ...
- 13.9k
5
votes
0
answers
85
views
special classes of ideals (eg. toric) that admit faster Buchberger algorithm?
I have heard that toric ideals allow one to speed up the Buchberger algorithm considerably (see Grobner bases of toric ideals, Remark 2,3). My question is two-fold:
What are the precise complexity-...
- 1,221
5
votes
0
answers
87
views
Problem to efficiently compute the Volume of $d$ anchored 4D cuboids
An easy still unsolved special case of Klee's measure problem with applications in multiple objective optimization is described in the following.
Let $[\vec a_1,\vec b_1],\dots,[\vec a_n,\vec b_n]$ ...
- 4,535
3
votes
0
answers
85
views
Computational complexity of exact computation of the doubling dimension
Given a finite metric space $X$, the doubling constant of $X$ is the smallest integer $k$ such that any ball of arbitrary radius $r$ can be covered by at most $k$ balls of radius $r/2$. The doubling ...
2
votes
0
answers
197
views
Is orthogonal polygon with crossings count NP-complete?
The are several NP-complete problems related to the construction of orthogonal simple polygons. Rapport showed that it is NP-complete to decide the existence of orthogonal simple polygon that passes ...
- 2,993
2
votes
0
answers
33
views
Algorithm for lightest unnested planar vertex-disjoint cycle-cover
Question:
given a finite set $\mathcal{P}$ of disjoint points in the Euclidean plane and the set $\mathcal{C}$ of all simple polygons whose corners are subsets of $\mathcal{P}$,
what is the ...
- 13.2k
2
votes
0
answers
58
views
Complexity of existence of simple polygonalization with prescribed area?
This is a followup on my previous question. Fekete proved the NP-completeness of deciding the existence of simple polygonalization with minimum (or maximum) enclosed area (simple polygonalization is ...
- 2,993
1
vote
0
answers
37
views
Computing all roots of a function with square-root terms
Given $3n$ positive numbers $a_1, \ldots, a_n$, $b_1, \ldots, b_n$, and $x_1, \ldots, x_n$, we are given a function
$$f(x) = \sum_{i = 1}^n \frac{a_i}{\sqrt{(x - x_i)^2 + b_i}}.$$
Can we find all the ...
- 11
1
vote
0
answers
46
views
Computational hardness of a discrete generalized rectangle packing problem
I have a decision problem that is clearly in NP, but I cannot seem to prove that it is in P, nor can I prove its NP-hardness. I attribute this more to my inexperience than to the problem's difficulty (...
1
vote
0
answers
68
views
Projection of a polytope along 4 orthogonal axes
Consider the following problem:
Given an $\mathcal{H}$-polytope $P$ in $\mathbb{R}^d$ and $4$ orthogonal vectors $v_1, ..., v_4 \in \mathbb{R}^d$, compute the projection of $P$ to the subspace ...
- 11