Consensus division in an arbitrary ratio
We consider the problem of partitioning a line segment into two subsets, so that n finite measures all have the same ratio of values for the subsets. Letting α ∈ [0, 1] denote the desired ratio, this generalises the PPA-complete consensus-halving problem, in which α = 12. Stromquist and Woodall [30]...
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| Materialtyp: | Conference item |
| Språk: | English |
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Schloss Dagstuhl – Leibniz-Zentrum für Informatik
2023
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| _version_ | 1826315158809477120 |
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| author | Goldberg, P Li, J |
| author_facet | Goldberg, P Li, J |
| author_sort | Goldberg, P |
| collection | OXFORD |
| description | We consider the problem of partitioning a line segment into two subsets, so that n finite measures all have the same ratio of values for the subsets. Letting α ∈ [0, 1] denote the desired ratio, this generalises the PPA-complete consensus-halving problem, in which α = 12. Stromquist and Woodall [30] showed that for any α, there exists a solution using 2n cuts of the segment. They also showed that if α is irrational, that upper bound is almost optimal. In this work, we elaborate the bounds for rational values α. For α = kℓ, we show a lower bound of k−k1 · 2n − O(1) cuts; we also obtain almost matching upper bounds for a large subset of rational α. On the computational side, we explore its dependence on the number of cuts available. More specifically, 1. when using the minimal number of cuts for each instance is required, the problem is NP-hard for any α; 2. for a large subset of rational α = kℓ, when k−k1 · 2n cuts are available, the problem is in PPA-k under Turing reduction; 3. when 2n cuts are allowed, the problem belongs to PPA for any α; more generally, the problem belong to PPA-p for any prime p if 2(p − 1) · ⌊⌈p/p/22⌋⌉ · n cuts are available. |
| first_indexed | 2024-12-09T03:20:38Z |
| format | Conference item |
| id | oxford-uuid:b4a0b73e-2e2c-48b8-bfe7-129ef6b80e5c |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-12-09T03:20:38Z |
| publishDate | 2023 |
| publisher | Schloss Dagstuhl – Leibniz-Zentrum für Informatik |
| record_format | dspace |
| spelling | oxford-uuid:b4a0b73e-2e2c-48b8-bfe7-129ef6b80e5c2024-11-06T16:07:02ZConsensus division in an arbitrary ratioConference itemhttp://purl.org/coar/resource_type/c_5794uuid:b4a0b73e-2e2c-48b8-bfe7-129ef6b80e5cEnglishSymplectic Elements Schloss Dagstuhl – Leibniz-Zentrum für Informatik2023Goldberg, PLi, JWe consider the problem of partitioning a line segment into two subsets, so that n finite measures all have the same ratio of values for the subsets. Letting α ∈ [0, 1] denote the desired ratio, this generalises the PPA-complete consensus-halving problem, in which α = 12. Stromquist and Woodall [30] showed that for any α, there exists a solution using 2n cuts of the segment. They also showed that if α is irrational, that upper bound is almost optimal. In this work, we elaborate the bounds for rational values α. For α = kℓ, we show a lower bound of k−k1 · 2n − O(1) cuts; we also obtain almost matching upper bounds for a large subset of rational α. On the computational side, we explore its dependence on the number of cuts available. More specifically, 1. when using the minimal number of cuts for each instance is required, the problem is NP-hard for any α; 2. for a large subset of rational α = kℓ, when k−k1 · 2n cuts are available, the problem is in PPA-k under Turing reduction; 3. when 2n cuts are allowed, the problem belongs to PPA for any α; more generally, the problem belong to PPA-p for any prime p if 2(p − 1) · ⌊⌈p/p/22⌋⌉ · n cuts are available. |
| spellingShingle | Goldberg, P Li, J Consensus division in an arbitrary ratio |
| title | Consensus division in an arbitrary ratio |
| title_full | Consensus division in an arbitrary ratio |
| title_fullStr | Consensus division in an arbitrary ratio |
| title_full_unstemmed | Consensus division in an arbitrary ratio |
| title_short | Consensus division in an arbitrary ratio |
| title_sort | consensus division in an arbitrary ratio |
| work_keys_str_mv | AT goldbergp consensusdivisioninanarbitraryratio AT lij consensusdivisioninanarbitraryratio |