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Track A: Algorithms, Complexity and Games
DOI: 10.4230/LIPIcs.ICALP.2026.114
Canonical Labelling of Random Regular Graphs

Authors: Mikhail Isaev, Tamás Makai, Brendan D. McKay, Paweł Prałat, Jane Tan, and Maksim Zhukovskii

Published in: LIPIcs, Volume 374, 53rd International Colloquium on Automata, Languages, and Programming (ICALP 2026)

Abstract
We prove that whenever d = d(n) → ∞ and n-d → ∞ as n → ∞, then with high probability for any non-trivial initial colouring, the colour refinement algorithm distinguishes all vertices of the random regular graph 𝒢_{n,d}. This, in particular, implies that with high probability 𝒢_{n,d} admits a canonical labelling computable in time O(min{n^ω, nd²+ndlog n}), where ω < 2.372 is the matrix multiplication exponent.
Cite as

Mikhail Isaev, Tamás Makai, Brendan D. McKay, Paweł Prałat, Jane Tan, and Maksim Zhukovskii. Canonical Labelling of Random Regular Graphs. In 53rd International Colloquium on Automata, Languages, and Programming (ICALP 2026). Leibniz International Proceedings in Informatics (LIPIcs), Volume 374, pp. 114:1-114:23, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2026)

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@InProceedings{isaev_et_al:LIPIcs.ICALP.2026.114,
  author =	{Isaev, Mikhail and Makai, Tam\'{a}s and McKay, Brendan D. and Pra{\l}at, Pawe{\l} and Tan, Jane and Zhukovskii, Maksim},
  title =	{{Canonical Labelling of Random Regular Graphs}},
  booktitle =	{53rd International Colloquium on Automata, Languages, and Programming (ICALP 2026)},
  pages =	{114:1--114:23},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-428-4},
  ISSN =	{1868-8969},
  year =	{2026},
  volume =	{374},
  editor =	{Bhattacharya, Sayan and Nanongkai, Danupon and Benedikt, Michael and Puppis, Gabriele},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.ICALP.2026.114},
  URN =		{urn:nbn:de:0030-drops-265039},
  doi =		{10.4230/LIPIcs.ICALP.2026.114},
  annote =	{Keywords: random graphs, regular graphs, colour refinement, canonical labelling, graph isomorphism}
}
Document
DOI: 10.4230/LIPIcs.SoCG.2022.38
On Comparable Box Dimension

Authors: Zdeněk Dvořák, Daniel Gonçalves, Abhiruk Lahiri, Jane Tan, and Torsten Ueckerdt

Published in: LIPIcs, Volume 224, 38th International Symposium on Computational Geometry (SoCG 2022)

Abstract
Two boxes in ℝ^d are comparable if one of them is a subset of a translation of the other one. The comparable box dimension of a graph G is the minimum integer d such that G can be represented as a touching graph of comparable axis-aligned boxes in ℝ^d. We show that proper minor-closed classes have bounded comparable box dimension and explore further properties of this notion.
Cite as

Zdeněk Dvořák, Daniel Gonçalves, Abhiruk Lahiri, Jane Tan, and Torsten Ueckerdt. On Comparable Box Dimension. In 38th International Symposium on Computational Geometry (SoCG 2022). Leibniz International Proceedings in Informatics (LIPIcs), Volume 224, pp. 38:1-38:14, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2022)

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@InProceedings{dvorak_et_al:LIPIcs.SoCG.2022.38,
  author =	{Dvo\v{r}\'{a}k, Zden\v{e}k and Gon\c{c}alves, Daniel and Lahiri, Abhiruk and Tan, Jane and Ueckerdt, Torsten},
  title =	{{On Comparable Box Dimension}},
  booktitle =	{38th International Symposium on Computational Geometry (SoCG 2022)},
  pages =	{38:1--38:14},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-227-3},
  ISSN =	{1868-8969},
  year =	{2022},
  volume =	{224},
  editor =	{Goaoc, Xavier and Kerber, Michael},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.SoCG.2022.38},
  URN =		{urn:nbn:de:0030-drops-160461},
  doi =		{10.4230/LIPIcs.SoCG.2022.38},
  annote =	{Keywords: geometric graphs, minor-closed graph classes, treewidth fragility}
}
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