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Let G,H be graphs, and G⁎H represent a specific graph product of G and H. Define im(G) as the largest t for which G contains a Kt-immersion. Collins, Heenehan, and McDonald posed the question: given im(G)=t and im(H)=r, how large can im(G⁎H) be? They conjectured im(G⁎H)≥tr when ⁎ denotes the strong product. In this note, we affirm that the conjecture holds for graphs with certain immersions, in particular when H contains Kr as a subgraph. As a consequence we also get an alternative argument for a result of Guyer and McDonald, showing that the line graphs of constant-multiplicity multigraphs satisfy the conjecture originally proposed by Abu-Khzam and Langston. © 2024 Elsevier B.V.
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Discrete Mathematics
ISSN: 0012-365X
Year: 2025
Issue: 1
Volume: 348
0 . 7 0 0
JCR@2023
CAS Journal Grade:4
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ESI Highly Cited Papers on the List: 0 Unfold All
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