Questions tagged [integer-programming]
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80
questions
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29 views
Optimum partitioning of vertices into mutually disjoint subsets in a weighted graph
tl;dr I'm trying to partition my students into groups with respect to their preferences, i.e. they can declare if they want to be with someone in a group or if they do not want to be with someone in a ...
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47 views
what is the LP gap of this particular non metric facility location problem in planar graphs?
Suppose I have a facility location problem with all service costs 0 (or infinity (in particular service costs are not metric)) such that the edges $ij$ for which facility $i$ can service client $j$ ...
2
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0answers
92 views
(Integer) Linear Program formulation of planarity?
Q: Is there an efficient (I)LP formulation of planarity?
More specifically, I am looking for a set of constraints that are satisfied by exactly all planar graphs on $n$ vertices, in order to optimize ...
1
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1answer
101 views
Ensuring integral maximizer from integral linear program
An integral linear program is one that has a maximizer that is integral. Sometimes it's possible to prove that a particular LP has this property, for example by proving that it's constraint matrix is ...
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80 views
Is the edge cover polytope integral on graphs with self-loops?
It is well known that the edge cover polytope is integral on simple graphs. I am wondering whether this also holds for graphs with self-loops.
Here is a Linear Relaxation of the edge cover polytope, ...
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109 views
Is the matching polytope integral?
In this document https://courses.engr.illinois.edu/cs598csc/sp2010/Lectures/Lecture9.pdf
they prove the integrality of the matching polytope using the integrality of the perfect matching polytope.
The ...
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0answers
72 views
Separation oracle for hitting all small cut on a graph?
We are given as input an undirected graph $G=(V,E)$, weights $w_e \ge 0$ for all $e\in E$ and an positive integer $k$. We aim to select a set of edges with the minimum weight, such that the cut set of ...
1
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1answer
86 views
Name of (and solution to) this generalization of linear assignment
I would like to know if the following problem is known and has any efficient solution.
Given an $n\times n$ score matrix $S$. Find the best $a$ elements, in terms of their sum of scores, such that no ...
2
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0answers
96 views
An integer programming on maximum number of triangles
Consider three distinct sets $A, B, C$ of $N$ elements respectively. For each pair of sets, say $A,B$, we introduce an variable for each combination of values $a,b$ as $x_{ab}$. Similarly, we ...
2
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0answers
30 views
Finding shortest calculation of the sum of a subset of a group, given sums for other previously summed subsets
Say $S=\{g\in G\}$ is a set of elements in an abelian group $G$ whose group operation $(+)$ is expensive to compute. Given a subset $T\subset S$, we want to compute the sum of $T$'s elements, $\...
5
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73 views
Relaxed minimum dominating set
(I moved this question from cs exchange to here, because it might be more on the topic here)
Let $G=(V,E)$ be a directed graph with $n$ nodes. For a subset of nodes $S\subseteq V$, let $\mathcal{N}(S,...
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11 views
Size of solutions in integer programming
Given a linear integer program $Ax\leq b$ with $A\in\mathbb Z^{m\times n}$ and $b\in\mathbb Z^m$ known is there a polynomial time algorithm to give tight upper bounds for $\log_2\|x\|_\infty$ and $\...
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86 views
Fixed dimension Linear Integer Programming in $NC$
We know if fixed dimension linear integer programming is in $NC$ then integer $GCD$ is in $NC$. Is this the only non-trivial implication of fixed dimension linear integer programming in $NC$?
5
votes
1answer
425 views
Is there a counterexample to this work?
Is there a counterexample to this claim https://arxiv.org/abs/1610.00353? They claim a $O(n^6)$ LP model with simulations to support. I think asking validity is not a reasonable problem. However ...
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130 views
Convex mixed linear integer programming with real nuclear norm objective and linear integer objective
Khachiyan and Porkolab in 'Integer optimization on convex semialgebraic sets' gave an $O(ld^{ O(k^4)})$ algorithm to minimize a degree $d$ form with integer coefficients of binary length at most $l$ ...
4
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1answer
157 views
Integer programming: enforce the constraint that a subgraph contains at most $k$ connected components?
I'm considering integer programming on an variation of Steiner Forest Problem:
Given a graph $G=(V,E)$, a cost function: $c:E \rightarrow R^{+}$, a terminal set $T \subseteq V$, and a positive ...
4
votes
1answer
466 views
Minimum Union-Sum Cost Path
I have a minimum cost path selection problem that is different from the usual shortest path in that each type of cost is accounted only once in the total cost of the path if multiple edges on the path ...
4
votes
1answer
147 views
Anti bin packing
I have a (practically) unlimited amount of McDonald's coupons that I can use only if I shop for at least 1 money.
Thus I want to partition my family's meal into as many parts as possible that all ...
1
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0answers
103 views
Fixed dimension Integer programming minus LLL in fixed parameter $NC$?
If you remove LLL part then is remaining part of
a. Lenstra algorithm
b. Barvinok algorithm
in $O(f(n)(\log(mL))^c)$ time on $O(g(n)(mL)^c)$ processors with fixed $c>0$ in fixed $n$ dimension, $m$ ...
1
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0answers
110 views
Solving 0/1 integer programming and solving ACC-of-SYM circuits
I am referring to the proof of Theorem 1.4 in this STOC 2014 paper, https://arxiv.org/abs/1401.2444. In particular my question is about the argument that begins in the 8th line of page 9 where the ...
2
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0answers
63 views
Has Khachiyan/Porkolob's convex integer optimization been implemented?
Khachiyan and Porkolab in 'Integer optimization on convex semialgebraic sets' gave an $O(ld^{ O(k^4)})$ algorithm to minimize a degree $d$ form with integer coefficients of binary length at most $l$ ...
0
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1answer
64 views
How do minimally violated k-mod cuts work (intuitive explanation)?
As a background, I am not a specialist in theoretical computer science. But I have to take an exam with research-level optimization topics, and I have to learn it on my own, without lectures or tutors....
4
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1answer
185 views
Have fixed parameter integer program algorithms ever been implemented for research use?
Have any fixed parameter integer programming algorithms described in Integer programming with a fixed number of variables been implemented? Is there a reference code that researchers can use?
4
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198 views
What exactly did Lenstra prove on mixed integer linear program?
I studied Lenstra's paper https://www.jstor.org/stable/3689168. I have no clue what complexity he provides on Mixed Integer Programming (it is too terse and it is not a stand alone paper as he assumes ...
1
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1answer
224 views
Max weight travel on a graph with deadline
Given a deadline $D>0$ and a complete graph $K_n$ (with loops) in which each edge $e_{ij}$ has a weight $w(e_{ij}) \ge 0$ and a travel time $l(e_{ij}) > 0$. Starting from one of the nodes, we ...
1
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1answer
215 views
Fixed parameter tractable Integer Programming and $FPP$
Integer programming is $NP$ complete however fixed parameter tractable in number of variables. Is the fixed parameter version in parametrized analogue of $P$-complete or in parametrized analogue of $...
1
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0answers
59 views
Polynomial cases of 0 1 quadratic programm with linear constraints
A pseudo boolean function f:{0,1}^n-> R is defined as f(x)= x^tQx +cx where
Q is a symmetric matrix with null elements in the diagonal. Finding the minimum of this function is solvable in polynomial ...
3
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0answers
104 views
Fixed parameter Integer Programming circuit depth complexity
It is well known Lenstra's and Kannan's algorithm achieves $n$-variable parameter $L$-bit integer programming solvability in $O(n^nL)$ time and $O(L)$ space.
If implemented as an arithmetic circuit ...
7
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0answers
306 views
Under what conditions does an Integer Programming problem run in polynomial time?
Given $AX\leq B$ where $A\in\Bbb Z^{m\times n}$,$B\in\Bbb Z^m$ finding $X\in\Bbb Z^n$ where $m\geq n$ is the integer programming problem. If $A$ is totally unimodular then the problem is solvable in ...
3
votes
1answer
132 views
Consequences of faster parameterized integer programming
Integer programming in $k$ variables can be done in $k^{O(k)}$ time and $O(k^c)$ space.
Is there any consequence if it can be done in $k^{O(k^\alpha)}$ time and $O(k^c)$ space for some $\alpha\in(0,1)...
3
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1answer
261 views
Space complexity of integer programming
Given $A\in\Bbb Z^{n\times k}$, $v\in\Bbb Z^n$ and variables $x_1,\dots,x_k$ given as a vector $x$ we know that solving $x\in\Bbb Z^k$ in $Ax\leq v$ is fixed parameter tractable. There is a ...
5
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2answers
379 views
On integer programming
Integer programming is NP-hard.
What is the status of integer programming problem that decides between existence of $\leq1$ solution and $>1$ solutions (note $0$ solutions falls in $\leq1$ ...
3
votes
1answer
191 views
Min cost set of edges to connect 2 subgraphs s.t dist of nodes between subgraphs <= K
I find myself with another graph problem that I can't find the name of. I was wondering if anyone was able to identify if this problem and any efficient algorithms to solve it are known.
The ...
3
votes
1answer
329 views
What are some example problems for integer programming that are *not binary*
I'm interested in NP-hard problems that have a "nice" integer-programming formulation (quadratic or linear, with quadratic or linear constraints) that is not binary.
Of course it is always possible ...
4
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0answers
283 views
Are there integer programs with small coefficients that only have large solutions?
It is well-known that if an integer linear program has a feasible solution, then it has a feasible solution whose bit size is polynomially bounded. For example, here is Theorem 13.4 from Papadimitriou ...
1
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1answer
280 views
Is finding an optimal solution to this Knapsack-like problem NP-hard?
Suppose our inputs are a set of objects with weights $w_1,...,w_n$. We have two separate sets of profits: $p_1,...,p_n$ and $v_1,...,v_n$. We wish to maximize $ \sum_{i=1}^{n} p_i(1-x_i)+\alpha_i ...
3
votes
1answer
235 views
Which is the approximation class of Minimum 0-1 integer programming if only non-negative integers are allowed?
I'm wondering which is the approximation class of Minimum 0-1 Integer Programming if only non-negative integers are used. That is:
minimize $c^T \cdot x$,
with $x\in \{0,1\}^n$ and $c\in (\mathbb{Z}^...
2
votes
0answers
406 views
How to prove integrality of LP with not totally unimodular matrix
I have a linear program (LP) for which the constraint matrix is NOT totally unimodular (TU). However, even though constraint matrix is small (14x20), extensive generation of random coefficients for ...
0
votes
2answers
499 views
NP completeness of linear $0-1$ assignment problem
Supposing we have a linear equation in $n^2$ variables with integer (negatives allowed) coefficients of at most $m$ bits each.
Partition $\Pi_1$ the variables into $n$ disjoint sets of $n$ variables ...
1
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1answer
235 views
On a Linearization of the Quadratic Assignment Problem
The Quadratic Assignment Problem formulated as an integer program:
\begin{align}
\mbox{minimize}\quad & \sum_{i=1}^n\sum_{j=1}^nc_{ij} x_{ij} + \sum_{i=1}^n\sum_{j=1}^n\sum_{k=1}^n\sum_{l=1}^n ...
2
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0answers
163 views
Runtime of Gomory's Cutting Plane Algorithm
I read in several sources that the use of Gomory's cuts exclusively in Integer Programming was shown to be inefficient in practice when Gomory had created them. But later down the line they were shown ...
2
votes
1answer
79 views
Complexity of generating a pseudo-Boolean function
A pseudo-Boolean function is a mapping from $\mathcal{B}^n = \{0, 1\}^n$ to
$\mathbb{R}$.
Following is a pseudo-Boolean function.
$$s_1 s_4 - s_2 s_3 - s_3 s_5 - s_2 s_5 + s_1 + s_4 - s_1 s_3 - ...
7
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0answers
69 views
Is there a name for this unimodilarity-related property?
Consider an arbitrary integer linear program of the form
$\min f(x,y) \\
@ \ Ax + By \leq c\\
x,y \in \mathbb{Z}_+$
If you continuous-relax the integer constraint and still always get integer ...
1
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0answers
948 views
Is there a reduction from a 0-1 knapsack problem to the unbounded problem?
As we know, an unbounded knapsack problem could be described as:
$\max \sum_{i=1}^nc_1x_i$
s.t. $\sum_{i=1}^na_ix_i\le b$
$x_i\ge0,x_i\in\mathbb Z,i=1,\cdots,n$
And for an 0-1 knapsack problem, we ...
-1
votes
1answer
260 views
convertion into integer linear program for Ising spin state problem [closed]
I am trying to model the Ising spin state problem into Integer linear program and find the optimal ground state using lp_solve. (This is just a miniature version of Ising state problem)
$$
maximise: \...
7
votes
1answer
119 views
Quanitifier Free Presburger Arithmetic: Upper bound on solution size?
DISCLAIMER: I had originally posted this to CS.SE, but I've deleted it and moved it here, since it received little attention, and I think it is a research level question.
According to this paper, if ...
6
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0answers
151 views
Are highly symmetric inequalities solvable over integers?
Suppose I have $n$ variables $x_1,\ldots,x_n$ that satisfy some inequalities that are highly symmetric, e.g., for all $S\subset [n], |S|=k$ we have $\sum_{i\in S} f(x_i,k)\le \sum_{i\in [n]} g(x_i,k)$,...
4
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1answer
407 views
FPT algorithm for mixed integer program
It is known that every integer linear program parameterized by the number of variables is FPT (fixed parameter tractable). Is every mixed integer program parameterized by the number of integer ...
5
votes
1answer
1k views
Reduction from SAT to 0,1 integer linear program with zero or one solutions
Probably this is well known. There is probabilistic reduction
from SAT to Unique SAT (0 or 1 solutions).
According to answer and comments derandomizing the reduction would imply $PH \subseteq \oplus ...
5
votes
0answers
59 views
Interpolating the Tutte polynomial at the values of two hyperbolas
In a MO question
basically I asked when the Tutte polynomial of planar graph
can be uniquely determined by the polynomially computable values at the special points
and at the two hyperbolas. The ...
