List Colouring Trees in Logarithmic Space

Conference Paper (2022)
Author(s)

Hans L. Bodlaender (Universiteit Utrecht)

Carla Groenland (Universiteit Utrecht)

Hugo Jacob (ENS Paris-Saclay)

Affiliation
External organisation
DOI related publication
https://doi.org/10.4230/LIPIcs.ESA.2022.24
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Publication Year
2022
Language
English
Affiliation
External organisation
ISBN (electronic)
9783959772471

Abstract

We show that List Colouring can be solved on n-vertex trees by a deterministic Turing machine using O(log n) bits on the worktape. Given an n-vertex graph G = (V,E) and a list L(v) ⊆ {1, . . . , n} of available colours for each v ∈ V , a list colouring for G is a proper colouring c such that c(v) ∈ L(v) for all v.

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