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Regularity and separation for Sierpi\'nski products of graphs

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arxiv 2506.16864 v1 pith:YWQLYY7J submitted 2025-06-20 math.CO

classification math.CO
keywords sierpinskiproductsgraphsplanarvertexclassclassification
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abstract

The Sierpi\'nski product of graphs generalises the vast and relevant class of Sierpi\'nski-type graphs, and is also related to the classic lexicographic product of graphs. Our first main results are necessary and sufficient conditions for the higher connectivity of Sierpi\'nski products. Among other applications, we characterise the polyhedral ($3$-connected and planar) Sierpi\'nski products of polyhedra. Our other main result is the complete classification of the regular polyhedral Sierpi\'nski products, and more generally of the regular, connected, planar Sierpi\'nski products. To prove this classification, we introduce and study the intriguing class of planar graphs where each vertex may be assigned a colour in such a way that each vertex has neighbours of the same set of colours and in the same cyclic order around the vertex. We also completely classify the planar lexicographic products.

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Cited by 3 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Automorphism Groups in Extremal Families of Polyhedral Graphs

    math.CO 2026-07 accept novelty 6.0 of 10

    Every minimum-order 3-polytopal graph with all degrees 3..n (n≥14) is asymmetric, and automorphism groups are classified for four other extremal polyhedral families.

  2. Classification of polyhedral graphs by numbers of common neighbours

    math.CO 2025-08 conditional novelty 6.0 of 10

    Every polyhedron is classified by its set of pair common-neighbour counts, with a complete trichotomy for every finite set of counts.

  3. On Sierpi\'{n}ski packing chromatic number and recognition of Sierpi\'{n}ski products

    math.CO 2025-07 reject novelty 6.0 of 10

    For Sierpiński products of complete graphs, paths, and stars, the paper determines or bounds the minimum and maximum packing chromatic number over all connecting functions, and gives a polynomial-time recognition algo...

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