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An 18-colour bound for locally irregular decompositions

Carla Negri Lintzmayer, Guilherme Oliveira Mota, Maycon Sambinelli, Vinicius Fernandes dos Santos

Source record

Source: arXiv

Published: Sep 8, 2026

arXiv: 2609.09355

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Source abstract

A graph is locally irregular if adjacent vertices have distinct degrees. A graph G is decomposable if its edge set can be decomposed into locally irregular graphs, and its locally irregular chromatic index lir(G) is the least number of graphs in such a decomposition. We prove that lir(G) <= 18 for every decomposable graph G, improving the previous bound of 220.

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