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research article

Integer points in the degree-sequence polytope

Bach, Eleonore
β€’
Eisenbrand, Friedrich  
β€’
Pinchasi, Rom  
February 1, 2025
Discrete Optimization

An integer vector 𝑏 ∈ Z𝑑 is a degree sequence if there exists a hypergraph with vertices {1, … , 𝑑} such that each 𝑏𝑖 is the number of hyperedges containing 𝑖. The degree-sequence polytope 𝒡 𝑑 is the convex hull of all degree sequences. We show that all but a 2βˆ’π›Ί(𝑑) fraction of integer vectors in the degree sequence polytope are degree sequences. Furthermore, the corresponding hypergraph of these points can be computed in time 2𝑂(𝑑) via linear programming techniques. This is substantially faster than the 2𝑂(𝑑2 ) running time of the current-best algorithm for the degree-sequence problem. We also show that for 𝑑 β©Ύ 98, 𝒡 𝑑 contains integer points that are not degree sequences. Furthermore, we prove that both the degree sequence problem itself and the linear optimization problem over 𝒡 𝑑 are NP-hard. The latter complements a recent result of Deza et al. (2018) who provide an algorithm that is polynomial in 𝑑 and the number of hyperedges.

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Type
research article
DOI
10.1016/j.disopt.2024.100867
Web of Science ID

WOS:001374281300001

Author(s)
Bach, Eleonore
Eisenbrand, Friedrich  

EPFL

Pinchasi, Rom  

EPFL

Date Issued

2025-02-01

Publisher

ELSEVIER

Published in
Discrete Optimization
Volume

55

Article Number

100867

Subjects

COMPLEXITY

β€’

Integer programming

β€’

Hypergraphic degree sequences

β€’

Degree-sequence polytope

β€’

Science & Technology

β€’

Technology

β€’

Physical Sciences

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
DISOPT  
Available on Infoscience
January 6, 2025
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/242517
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