Contractible Edges and Peripheral Cycles in 3-Connected Graphs


  • Alexander Slodkowski University of Texas Rio Grande Valley
  • Dr. Timothy Huber Mentor, University of Texas Rio Gran Valley



contractible edges, induced subgraphs, non-separating cycles, peripheral cycles, 3-connected graphs


Peripheral cycles (induced non-separating cycles) in a general 3-connected graph are analogous to the faces of a polyhedron. Using the works of various authors, this paper explores the distribution of contractible edges in 3-connected graphs as needed to prove a major result originally by Tutte: each edge in a 3-connected graph is part of at least 2 peripheral cycles that share only the edge and its end vertices. A complete, alternative proof of this theorem is provided. The inductive step is generalized into a new independent lemma, which states that each edge in a 3-connected graph with a non-adjacent contractible edge has at least as many peripheral cycles as in the contracted one.


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References or Bibliography

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How to Cite

Slodkowski, A., & Huber, T. . (2021). Contractible Edges and Peripheral Cycles in 3-Connected Graphs. Journal of Student Research, 10(2).



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