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Journal of Information and Optimization Sciences cover
Hybrid ·Peer-reviewed·ISSN (Online): 2169-0103·ISSN (Print): 0252-2667

WoS  JIF 2026 : 0.4 (Q4)

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Open Access Research Article

Topological indices of johnson graphs and their complements

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pp. 1–18Online FirstJuly 2026DOI: 10.47974/JIOS-2140XML
Received:
01 Feb 2025
Published Online:
11 Jul 2026
Article type:
Research Article
Language:
EN
Article no.:
JIOS-2140
Pages:
1–18

Abstract

The connectivity of the complements of the Johnson graphs 𝒥(ℵ, 𝓇) is completely characterized for every ℵ ≥ 2𝓇. A combinatorial identity as a variation of vandermonde’s identity has been established to compute the Wiener index of Johnson graphs 𝒥(ℵ, 𝓇) and their compliments 𝒥(ℵ, 𝓇)  (whenever connected) by utilizing the vertex-transitivity of both the families of graphs. In addition, the Szeged index of 𝒥(ℵ, 𝓇) and 𝒥(ℵ, 𝓇) is also obtained by using the edge transitivity and examining a connection between the topology of the vertices in both the graphs, respectively, because the complement of a symmetric graph need not to be edge-transitive, in particular, 𝒥(ℵ, 𝓇) is not edge transitive for 𝓇 ≠ 1, 2 & ℵ-1.

Keywords

Subject Classifications

05C0905C1205C4005C70

References

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