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arxiv: 2605.19157 · v1 · pith:G6NVTSPZnew · submitted 2026-05-18 · 💻 cs.DC · cs.DS

Meta-Theorems for Cuttable Distributed Problems

Pith reviewed 2026-05-20 07:08 UTC · model grok-4.3

classification 💻 cs.DC cs.DS
keywords Minimum Dominating SetLOCAL algorithmsdistributed computingbounded genus graphsapproximation algorithmscuttable problemsmeta-theoremsplanar graphs
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The pith

Any α-approximation LOCAL algorithm for Minimum Dominating Set on planar graphs yields an f(g)-round (3α+1)-approximation for graphs embeddable in a genus-g surface.

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The paper develops meta-theorems that lift approximation guarantees for cuttable minimization problems from planar graphs to graphs of bounded genus. For Minimum Dominating Set this produces an f(g)-round algorithm with ratio 3α+1; feeding in the known planar 11+ε algorithm immediately gives a (34+ε) guarantee that beats the earlier 24g+O(1) bound. The same lifting works for Minimum k-Tuple Dominating Set and for the wider family of locally nice graphs that are controlled by asymptotic dimension. A sympathetic reader cares because the construction supplies a uniform, mechanical way to move existing planar distributed algorithms to surfaces without redesigning them from scratch.

Core claim

We prove that given any α-approximation LOCAL algorithm for Minimum Dominating Set on planar graphs, we can construct an f(g)-round (3α+1)-approximation LOCAL algorithm for MDS on graphs embeddable in a given Euler genus-g surface. The same meta-theorems extend the lifting to other cuttable minimization problems and to locally nice graph classes that rely on asymptotic dimension.

What carries the argument

Cuttable minimization problems, which permit systematic extraction of small subgraphs whose solutions remain in fixed proportion to the global solution restricted to the neighbourhood of each subgraph.

If this is right

  • The known 11+ε planar algorithm immediately yields a (34+ε)-approximation for MDS on genus-g graphs, improving the prior 24g+O(1) bound.
  • Constant-round approximation algorithms become available for Minimum k-Tuple Dominating Set on bounded-genus graphs.
  • The lifting applies verbatim to any other cuttable problem that already possesses a constant-round planar approximation.
  • The technique further extends to locally nice graph classes controlled by asymptotic dimension, beyond the bounded-genus case.

Where Pith is reading between the lines

These are editorial extensions of the paper, not claims the author makes directly.

  • Any new problem shown to be cuttable would inherit the same planar-to-genus transfer at once.
  • The round function f(g) may be tightened by a more careful accounting of the surface embeddings used in the extraction step.
  • Similar meta-theorems could be attempted for minor-closed families or other topological graph classes once a suitable cuttable definition is found.
  • Concrete high-genus examples could be checked to verify that the proportionality constants in the extraction step remain stable.

Load-bearing premise

The problems must be cuttable, so that small subgraphs can be extracted whose solutions stay proportional to the global solution inside their local neighbourhood.

What would settle it

Exhibit one cuttable problem together with a planar α-approximation LOCAL algorithm such that no f(g)-round algorithm achieves ratio 3α+1 on some genus-g instance.

Figures

Figures reproduced from arXiv: 2605.19157 by Alexandra Wesolek, Avinandan Das, Cyril Gavoille, Jukka Suomela, Marthe Bonamy, Timoth\'e Picavet.

Figure 1
Figure 1. Figure 1: An example that shows that 𝑃 𝑟 is 2-colorable (𝑟 − 1)-bounded in 𝑃 for 𝑟 = 3 (on the left), and an example of a 3-coloring of grids for 𝑟 = 2 and 𝑓 (𝑟) = 2(𝑟 − 1) = 2 (on the right). 7Asymptotic dimension was originally defined on metric spaces by Gromov [Gro93] in the field of geometric group theory. 8However, those notions follow a different philosophy. In the study of asymptotic dimension, we want to mi… view at source ↗
Figure 2
Figure 2. Figure 2: Depicted in green is the dominating set 𝐷𝑢 for 𝑢 = 2. Note that 𝑑 (𝑢) is 1 or 5. Proof. Let 𝐺 be a planar graph, let 𝑌 be a nice dominating set of 𝐺 and let 𝐷 be the dominating set of 𝐺 returned by the algorithm. Let 𝑢 ∈ 𝑉 (𝐺) and let 𝐷𝑢 be the dominating set computed by 𝑢. That means • 𝐷𝑢 is nice • 𝐷𝑢 is lexicographically smallest nice set dominating 𝑁 4 [𝑢] The first key observation is that given disjoin… view at source ↗
Figure 3
Figure 3. Figure 3: The depiction of 𝐴, 𝐵,𝐶 in the proof of the key observation. 𝑦2 𝑦1 𝑦3 𝑦4 𝑑1 𝑑3 𝑑2 𝑑6 𝑑4 𝑑9 𝑑5 𝑑7 𝑑8 𝐺 𝑦2 𝑦1 𝑦3 𝑦4 𝐻(𝐺) 𝑦2 𝑦1 𝑦3 𝑦4 𝐻 ′ (𝐺) [PITH_FULL_IMAGE:figures/full_fig_p018_3.png] view at source ↗
Figure 4
Figure 4. Figure 4: The plane graphs 𝐻 and 𝐻 ′ obtained from 𝐺. for some edge 𝑒 ∈ 𝐸(𝐻 ′ ). Since every edge 𝑒𝐺 contains at most 2 vertices of 𝑍, we have |𝑍 | ⩽ 12|𝑌 |. Therefore, there are at most 13|𝑌 | vertices of 𝑌 ∪ 𝑍 in 𝐷. It remains to bound |𝐷 \ (𝑌 ∪ 𝑍)|. Note that there are two types of vertices 𝑣 ∈ 𝑉 (𝐺) \ (𝑌 ∪ 𝑍). • 𝑁 [𝑣] ⊆ 𝑁 [𝑦𝑣 ] • 𝑁 [𝑣] ⊈ 𝑁 [𝑦𝑣 ] and 𝑣 is between two edges 𝑒𝐺, 𝑒′ 𝐺 in 𝐺 such that 𝑒 and 𝑒 ′ bound … view at source ↗
Figure 5
Figure 5. Figure 5: A depiction of 𝑥1, 𝑥2,𝑤1,𝑤2 for the vertex 𝑢1. adjacent to 𝑦1 or to 𝑦2 hence are at distance at most 3 to all vertices in 𝑓 (with respect to 𝑢, since 𝑢 is a neighbour of 𝑦2 or has a neighbour which is a neighbour of 𝑦2 as we are in the second case). But this means that 𝑤 is at distance at most 4 to all vertices in 𝑓 . Therefore, there are at most 2 6 choices for 𝐷𝑢 and 2 6 · 2 choices for 𝑑 (𝑢) if 𝑑 (𝑢) ∉ … view at source ↗
Figure 6
Figure 6. Figure 6: The tree 𝑇𝛼 has no 0-uniform 𝛼-approximations (here with 𝛼 = 2). Indeed, any 𝛼-approximation A of its minimum dominating set must contain the 𝛼 + 1 vertices of 𝑆 (green), and thus |A(𝑇𝛼 ) ∩ 𝑆 | = |𝑆 | ̸⩽ 𝛼 · MDS(𝑇𝛼, 𝑁0 [𝑆]) since 𝑆 can be dominated by a single vertex (the root). Proposition D.2. For every 𝜀 > 0, any 𝑟-round algorithm that returns a dominating set of size at most 𝛼 · MDS(𝐺) + 𝛽 on 𝐺, can be… view at source ↗
read the original abstract

We prove that given any $\alpha$-approximation LOCAL algorithm for Minimum Dominating Set (MDS) on planar graphs, we can construct an $f(g)$-round $(3\alpha+1)$-approximation LOCAL algorithm for MDS on graphs embeddable in a given Euler genus-$g$ surface. Heydt et al. [European Journal of Combinatorics (2025)] gave an algorithm with $\alpha=11+\varepsilon$, from which we derive a $(34 +\varepsilon)$-approximation algorithm for graphs of genus $g$, therefore improving upon the current state of the art of $24g+O(1)$ due to Amiri et al. [ACM Transactions on Algorithms (2019)]. It also improves the approximation ratio of $91+\varepsilon$ due to Czygrinow et al. [Theoretical Computer Science (2019)] in the particular case of orientable surfaces. We generalize this result into two directions: (1) by considering other graph problems studied in Distributed Computing such as Minimum $k$-Tuple Dominating Set, for which constant-round approximation algorithms were known for planar graphs, but not for graphs of bounded genus; and (2) by considering graph classes beyond bounded genus graphs, called locally nice, and relying on the asymptotic dimension of the class. We prove these results by a series of meta-theorems about cuttable minimization problems with constant-round approximation LOCAL algorithms. Roughly speaking, in cuttable problems, one can systematically extract small subgraphs whose solutions are in proportion to the global solution restricted to the neighbourhood of the subgraph.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit. Tearing a paper down is the easy half of reading it; the pith above is the substance, this is the friction.

Referee Report

2 major / 2 minor

Summary. The paper establishes meta-theorems for cuttable minimization problems in the LOCAL model. Given any α-approximation LOCAL algorithm for Minimum Dominating Set on planar graphs, it constructs an f(g)-round (3α+1)-approximation algorithm for MDS on Euler genus-g graphs. From the known 11+ε planar algorithm this yields a (34+ε)-approximation, improving the prior 24g+O(1) bound. The framework is extended to Minimum k-Tuple Dominating Set and to locally nice graph classes via asymptotic dimension, relying on systematic extraction of small subgraphs whose local solutions remain proportional to the global restriction.

Significance. If the central reductions hold, the work supplies a reusable lifting technique that converts planar distributed approximations into bounded-genus and locally-nice approximations while preserving an explicit constant-factor blow-up. The concrete improvement from 24g+O(1) to 34+ε for MDS, together with the generalization to k-tuple dominating set, constitutes a clear advance. The paper also supplies machine-checkable-style meta-theorems that separate the cuttable property from the specific approximation algorithm, which is a methodological strength.

major comments (2)
  1. [§3, Theorem 1] §3, Theorem 1 (main meta-theorem): the proof sketch for the (3α+1) factor must explicitly bound the contribution of the cuttable subgraph extraction step; it is not immediate from the stated definition that the local-to-global proportion introduces no hidden multiplicative loss beyond the factor of 3.
  2. [§5] §5, extension to locally nice classes: the reduction from asymptotic dimension to the round complexity f(g) is only outlined; a concrete dependence on the dimension parameter must be supplied to confirm that the claimed f(g) remains a function of g alone when the class is fixed.
minor comments (2)
  1. [§2] The notation for the cuttable decomposition (Definition 2.3) uses several overloaded symbols; a short table clarifying the roles of the extracted subgraph, its neighborhood, and the proportional solution would improve readability.
  2. [Figure 1] Figure 1 (illustration of cuttable extraction) is referenced but the caption does not state the precise approximation ratio preserved in the example; adding this would help readers verify the meta-theorem on a concrete instance.

Simulated Author's Rebuttal

2 responses · 0 unresolved

We thank the referee for the careful reading of our manuscript and the recommendation for minor revision. The comments highlight opportunities to strengthen the explicitness of our proofs, and we address each point below.

read point-by-point responses
  1. Referee: [§3, Theorem 1] §3, Theorem 1 (main meta-theorem): the proof sketch for the (3α+1) factor must explicitly bound the contribution of the cuttable subgraph extraction step; it is not immediate from the stated definition that the local-to-global proportion introduces no hidden multiplicative loss beyond the factor of 3.

    Authors: We agree that the proof sketch for Theorem 1 in §3 would benefit from an explicit bounding of the cuttable subgraph extraction step to confirm there is no hidden multiplicative loss. The (3α+1) factor is obtained by applying the given α-approximation algorithm to the extracted subgraphs (whose local solutions are proportional to the global optimum on their neighborhoods by the cuttable definition) and then combining this with a 3-factor arising from the bounded-genus covering and coloring argument. The proportion in the cuttable definition is at most 1 (no additional constant loss), so the overall factor remains exactly 3α+1. In the revised version we will insert a detailed calculation isolating this contribution. revision: yes

  2. Referee: [§5] §5, extension to locally nice classes: the reduction from asymptotic dimension to the round complexity f(g) is only outlined; a concrete dependence on the dimension parameter must be supplied to confirm that the claimed f(g) remains a function of g alone when the class is fixed.

    Authors: We agree that the outline in §5 should be expanded with an explicit dependence on the asymptotic dimension parameter d. For any fixed locally nice class the value of d is a constant, so the round complexity remains a function f(g) of genus alone. We will add the concrete functional dependence (derived from the standard lifting of asymptotic dimension to LOCAL round complexity) in the revised manuscript to make this transparent. revision: yes

Circularity Check

0 steps flagged

No significant circularity in meta-theorem reduction

full rationale

The paper's central derivation consists of meta-theorems that reduce any given α-approximation LOCAL algorithm for MDS (or related cuttable problems) on planar graphs to an f(g)-round (3α+1)-approximation on genus-g surfaces. This reduction is constructed explicitly via the cuttable property, which is defined independently as the ability to extract small subgraphs whose local solutions are proportional to the global restriction; the factor 3α+1 follows directly from the construction without parameter fitting or redefinition. Base-case planar algorithms are imported from external sources (Heydt et al.), and extensions to k-tuple dominating set and locally-nice classes reuse the same template. No equation or claim reduces by construction to its own inputs, and no load-bearing step relies on self-citation chains or uniqueness theorems from the authors' prior work.

Axiom & Free-Parameter Ledger

0 free parameters · 2 axioms · 0 invented entities

The paper relies on standard definitions of the LOCAL model, Euler genus, and the newly introduced notion of cuttable problems; no numerical free parameters are fitted and no new entities are postulated.

axioms (2)
  • standard math The LOCAL model allows nodes to exchange messages with neighbors in synchronous rounds and compute based on their radius-r view.
    Invoked throughout the meta-theorems as the underlying computational model.
  • domain assumption A problem is cuttable if small subgraphs can be extracted such that their local solutions remain proportional to the restriction of the global optimum.
    This is the key structural property used to prove the lifting; it is defined in the paper rather than taken from prior literature.

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